do an xu li nuoc thai

n XL N c Th i GVHD:T.S.Tr n V n QuangMC LCLI M UI. NHIM V THIT K V CC S LIU C SII. CC TI LIU THIT K1.Bn a hnh khu vc2.iu kin kh hu3.S liu v nc thi4.Ti liu v a cht cng trnh5.Yu cu c bn v cht lng ncIII.XC NH LU LNG TNH TON1.Xc nh lu lng tnh ton ca nc thi2.Xc nh nng cht bn ca nc thi theo SS v BOD3.Xc nh dn s tnh ton4.Xc nh mc cn thit x l nc thi5.La chn cng ngh ca trm x l6.Thuyt minh phng n cng nghIV.TNH TON DY CHUYN CNG NGH X L NC THI1.Ngn tip nhn nc thi2.Tnh ton song chn rc3.Tnh ton b lng ct4.Thit b o lu lng5.B lng ly tm t 16.B Aroten7.B lng ly tm t 28.B nn bn9.B m tan................................................................................................................10.Sn phi bn.......................................................................................................111.Kh trng nc thi........................................................................................23V.B TR MT BNGKT LUNTI LIU THAM KHOSVTH:Cao Vn Cnh- Lp 07MT2 Trang 1 n XL N c Th i GVHD:T.S.Tr n V n QuangLI M U Nc l ngun ti nguyn rt cn thit cho s sng. Ngy nay do nhu cu s dng nc ngy cng tng, mt lng ln nc thi x vo ngun nc mt. Ngun nc sch trn hnh tinh b p lc t hai hng: s dng cho cc hot ng kinh t - x hi ca con ngi, dng pha long v lm sch nc thi trong cc thy vc. Con ngi can thip ngy mt mnh m vo chu trnh thy vn ton cu. V vy cn phi c chin lc v bin php s dng v bo v ngun nc mt cch hp l. X l nc thi cng l mt trong nhng bin php quan trng trong chin lc bo v ngun nc. X l nc thi l mt mn hc chuyn ngnh khng th thiu ca ngnh Cng ngh Mi trng. Bn cnh l thuyt hc th n cng l mt phn quan trng cng c l thuyt v vn dng n vo trong thc t mt cch hiu qu nht. Khi lm n gip chng ta hc hi thm nhiu kinh nghim trong qu trnh hc v to cho chng ta s t duy cao. Khi lm n ny i hi chng ta phi tm ra phng n kh thi nht m khi p dng vo thc t n va m bo cht lng nc sau x l, va qun l v vn hnh d m cng va kinh t. V chnh l nhng bc i u tin, hc hi c nhiu kinh nghim lm hnh trang cho chng em bc vo cuc sng ca nn khoa hc k thut ngy cng pht trin nh hin nay.Nh s hng dn tn tnh ca thy b mn Trn Vn Quang gip chng em hon thnh n ny. Nhng y l n i hi s t duy v lng kin thc ln nn trong qu trnh lm n khng th khng trnh khi nhng sai st v sai lch trong nhn nh, do s c nhng sai lch trong l lun cng nh trong cch lm nn rt mong thy xem xt v ch bo thm em hon thnh tt hn n.Sinh vin thc hin Cao Vn Cnh SVTH:Cao Vn Cnh- Lp 07MT2 Trang 2 n XL N c Th i GVHD:T.S.Tr n V n Quang

N X L NC THII. NHIM V THIT K V CC S LIU C S:Thit k s b trm x l nc thi cho mt thnh ph v thit k k thut mt cng trnh ca trm.II. CC TI LIU THIT K:1. Bn a hnh khu vc trm x l.2. iu kin kh hu ca thnh ph:- Hng gi ch o trong nm: ng ng Nam- Nhit trung bnh nm ca khng kh: 190C3. S liu v nc thi ca thnh ph:a) Nc thi sinh hot:- Dn s thnh ph: N = 350000 ngi- Tiu chun cp: qc = 180 l/ng.ngb) Nc thi sn xut v dch v:c) Nhit trung bnh ca hn hp nc thi sinh hot v cng nghip v ma ng: 170CSVTH:Cao Vn Cnh- Lp 07MT2 Trang 3S liu v nc thiTn nh my, dch vBnh vinNh my Thu Sn 1Nh my biaThi gian hot ng, gi /ng 24/24 16/24 24/24Lu lng, m3/ng 450l/ging 4000 2500Hm lng cht l lng, mg/l 450 380BOD5, mg/l 850 250COD, mg/l 1500 350 n XL N c Th i GVHD:T.S.Tr n V n Quang4. Ti liu v a cht cng trnh, a cht thy vn v s dng t ai xung quanh khu vc trm x l:a) Mc nc ngm:+ Ma kh su di mt t: 7m+ Ma ma su di mt t: 5mb) Quy hoch mt bng trm x l: Ngoi Thnh.5. Yu cu c bn v cht lng nc thi sau khi x l x vo ngun tip nhn:- Hm lng cht l lng: khng c vt qu 50 mg/l- Nhu cu oxy sinh ho BOD5: khng c vt qu 150 mg/l( QCVN 08/2008 )III. XC NH CC THNG S TNHTON:1. Xc nh lu lng tnh ton ca nc thi:a) Lu lng nc thi sinh hot: Tiu chun thot nc trung bnh ly bng 80% tiu chun cp:qtb = 0,8 qc = 0,8.180 = 144 ( m3/ng) Lu lng nc thi sinh hot trung bnh ngy m tnh theo cng thc : shngd tbQ = 1000.N qtb= 144.3500001000= 50400( m3/ng) Lu lng nc thi sinh hot trung bnh gi tmh theo cng thc : shh tbq= 24 . 1000.N qtb = 144.3500001000.24 = 2100 ( m3/h) Lu lng nc thi sinh hot trung bnh giy tnh theo cng thc : shs tbq=1000 .3600shh tbq = 2100.10003600 = 583,33 ( l/s)Tra bng 2 ( iu 4.12 TCVN 7957-2008 ) shs tbq= 583,33(l/s) tng ng Kch = 1,48 Lu lng nc thi sinh hot ln nht ngy m:shngdQ max = shngd tbQ . Kch = 50400.1,48 = 74592 ( m3/ng) Lu lng nc thi sinh hot ln nht gi :shh mzxq = shh tbq.Kch = 2100.1,48 = 3100( m3/h) Lu lng nc thi sinh hot ln nht giy :shsq max = shs tbq.Kch = 583,33.1,48 = 863,33( l/s)b) Lu lng nc thi ca nh my bia: Thi gian lm vic :24h/ngy Lu lng nc thi trung bnh ngy m ca nh my bia l:

biangd tbQ = 2500 ( m3/ng)SVTH:Cao Vn Cnh- Lp 07MT2 Trang 4 n XL N c Th i GVHD:T.S.Tr n V n Quang Lu lng nc thi trung bnh gi ca nh my bia l:biah tbq= 24biangd tbQ = 250024 = 104,167 ( m3/h) Lu lng nc thi trung bnh giy ca nh my bia l:bias tbq = 36001000 .biah tbq = 104,167.10003600 = 28,94 ( l/s)c) Lu lng nc thi ca bnh vin:S ging bnh : 500 gingTiu chun thot nc ca bnh vin :BVtq=450 ( l/ngi.ng )Lu lng nc thi trung bnh ngy m ca bnh vin l:bnng tbQ = .1000BVtq N 450.5001000= 225 ( m3/ng)Vi N : s ging bnh. Lu lng nc thi trung bnh gi ca bnh vin l:bvh tbq = 24bvngd tbQ = 22524= 9,375 ( m3/h) Lu lng nc thi trung bnh giy ca bnh vin l:bvs tbq = 36001000 .bvh tbq = 9, 375.10003600= 2,6( l/s)d) Lu lng nc thi ca nh my Thu Sn 1 Lu lng nc thi trung bnh ngy m ca nh my Thu Sn 1tsngd tbQ= 4000 ( m3/ng) Lu lng nc thi trung bnh gi ca nh my Thu Sn 1tsh tbq = 12tsngd tbQ = 400016 = 250 ( m3/h) Lu lng nc thi trung bnh giy ca nh my Thu Sn 1 l:tss tbq = 36001000 .tsh tbq=250.10003600= 69,44 ( l/s)e)Lu lng tnh ton nc thi khu th Lu lng tng cng trung bnh ngy mtcngd tbQ = iQ = shngdQ max + bvngd tbQ+ biangd tbQ + tsngd tbQ = 50400 + 225 + 2500 + 4 = 94089( m3/ng) Lu lng tng cng trung bnh gi :tch tbq =24tcngd tbQ = 2494089 = 3920,4 ( m3/h) Lu lng tng cng trung bnh giy :SVTH:Cao Vn Cnh- Lp 07MT2 Trang 5 n XL N c Th i GVHD:T.S.Tr n V n Quangtcs tbq = 36001000 .tch tbq = 36001000 . 4 , 3920 = 1089 (l/s) Lu lng tng cng ln nht ngy mtcngdQ max = iQ = shngdQ max + bvngd tbQ+ biangd tbQ + tsngd tbQ =74592 + 225 + 2500 + 4000 = 81317 ( m3/ng) Lu lng tng cng ln nht gi :tchq max =3513,542( m3/h) Lu lng tng cng ln nht giy :tcsq max = 36001000 .maxtchq = 3513, 542 .10003600 =976 (l/s) Lu lng tng cng nh nht gi:tchq min =869,542 ( m3/h) Lu lng tng cng nh nht giy:tcsq min = 36001000 .mintchq= 869, 542.10003600 =241,54 (l/s)Bng phn b lu lng:Cc giNc thi sinh hotNc thi nh my biaNc thi bnh vinNc thi Dt nhumLu lng tng cng%Qshm3m3m3m3m3%QtcSVTH:Cao Vn Cnh- Lp 07MT2 Trang 6 n XL N c Th i GVHD:T.S.Tr n V n Quang0-11-22-33-44-55-66-77-88-99-1010-1111-1212-1313-1414-1515-1616-1717-1818-1919-2020-2121-2222-2323-241,51,51,51,52,53,54,55,56,256,256,256,255,05,05,56,06,05,55,04,54,03,02,01,57567567567561260176422682772315031503150315025202520277230243024277225202268201615121008756104,167104,167104,167104,167104,167104,167104,167104,167104,167104,167104,167104,167104,167104,167104,167104,167104,167104,167104,167104,167104,167104,167104,167104,1679,3759,3759,3759,3759,3759,3759,3759,3759,3759,3759,3759,3759,3759,3759,3759,3759,3759,3759,3759,3759,3759,3759,3759,37500000250250250250250250250250250250250250250250250250000869,542869,542869,542869,5421371,5422127,5422631,5423135,5423513,5423513,5423513,5423513,5422883,5422883,5423135,5423387,5423387,5423135,5422883,5422631,5422379,5421625,5421121,542869,5421,5221,5221,5221,5222,4043,7244,6075,4896,1516,1516,1516,1515,0485,0485,4895,9305,9305,4895,0484,6074,1162,8461,9631,522Tng 100 50400 2500 225 4000 57125 1002. Xc nh nng cht bn nc thi theo cht l lng (SS) v theo (BOD)a) Xc nh nng cht bn theo cht l lng SS: Hm lng cht l lng SS trong nc thi sinh hot c tnh theo cng thc sau:Csh = (350000.0, 6.30 350000.0, 4.60).100050400.1000+= 291,67 (mg/l)Trong :60 l ti lng cht l lng ca nc thi sinh hot cho 1 ngi trong mt ngy m ly theo ( bng 7-4,iu 7.7 TCVN 51/2008 ) nll = 60g/ng.ng 30 :l ti lng cht l lng ca nc thi sinh hot cho 1 ngi trong mt ngy m khi h s dng b t hoi0,6 :S h s dng b t hoi 0,4 : S h khng s dng b t hoi 50400 :lu lng thot nc (m3/ng )SVTH:Cao Vn Cnh- Lp 07MT2 Trang 7 n XL N c Th i GVHD:T.S.Tr n V n Quang Hm lng cht l lng trong nc thi ca cc nh my sn xut ,trong khu th phi x l s b t tiu chun thi (TCVN 5945/2008 ,C = 200 mg/l) trc khi x vo h thng thot nc ca th Hm lng cht l lng SS trong nc thi ca nh my biaC = 380 mg/l( Vt mc tiu chun phi x l cc b t Cbia = 200 mg/l) Hm lng cht l lng SS trong nc thi ca nh my Thu Sn 1C = 450 mg/l( Vt mc tiu chun phi x l cc b t Cthuysan1 = 200 mg/l)Hm lng cht l lng SS trong nc thi ca bnh vin:H s phc v 1:1 S ngi trong bnh vin : 500 x 2 = 1000 ngiCbv = .1000llbvtb ngnQ = = 60.1000266, 667225 (mg/l)Hm lng cht l lng trong nc thi ca bnh vin khi x vo h thng thot nc ca khu th phi tho mn (TCVN 7382/2004 , C = 100 mg/l ) Hm lng cht l lng SS trong hn hp nc thi :Ctc = thuysan bia bv shthuysan thuan bia bia bv bv sh shQ Q Q QQ C Q C Q C Q C+ + + + + =4000 2500 225 504004000 200 2500 200 225 100 50400 67 , 291+ + ++ + + x x x x = 280,48 (mg/l)b) Xc nh nng cht bn theo BOD: Hm lng BOD trong nc thi sinh hot c tnh theo cng thc sau:Lsh = tBODqn 1000 = 1000 504001000 ) 30 4 , 0 350000 21 6 , 0 350000 (xx x x x x + = 170,83 ( mg/l )nBOD : ti lng cht bn theo BOD5 ca nc thi sinh hot tnh cho 1 ngi trong ngy m ly theo bng 7-4,iu 7.7 TCVN 51/2008 ), nNOS = 30 g/ng.ng. Hm lng cht hu c tnh theo BOD5 trong nc thi ca cc nh my sn xut trong khu th phi x l s b t c tiu chun thi ,( TCVN 5945/2008 , LBOD5 = 100 mg/l ) trc khi x vo h thng thot nc ca th Hm lng BOD5 ca nc thi nh my biaLbia = 250 mg/l(vt mc TCphi x l cc b t Lbia = BOD5 = 100 mg/l) Hm lng BOD5 ca nc thi nh my thy sn 1LThySn1 =850mg/l (vt mc TCphi x l cc b t LThySn1 = BOD5 = 100 mg/l) Hm lng BOD5 trong nc thi bnh vin c tnh theo cng thc sau:BVng tbBOD BODBVQN nL.5 = 2251000 30x= 133,33 (mg/l)SVTH:Cao Vn Cnh- Lp 07MT2 Trang 8 n XL N c Th i GVHD:T.S.Tr n V n QuangHm lng cht hu c tnh theo BOD5 trong nc thi bnh vin khi x vo h thng thot nc ca th phi tha mn ,( TCVN 7382/2004 , LBOD5 = 30 mg/l ) 33 , 1335BODBVL mg/l > 30 ng/l ,phi x l s b Hm lng NOS5 trong hn hp nc thi:TS TS bv shTS TS bia bia bv bv sh shtcQ Q Q QQ L Q L Q L Q LL+ + + + +

= 4000 2500 225 504004000 100 2500 100 225 30 50400 83 , 170+ + ++ + + x x x x=162,21 (mg/l)3. Xc nh dn s tnh ton Dn s tng ng theo cht l lng lltdN=llbv bv bia bia TS TSnQ C Q C Q C .. .+ +=60225 100 2500 200 4000 200 x x x + += 22042 (ngi) Dn s tnh ton theo cht l lng:Nll = N + lltdN = 3500000 + 22042 =372042 (ngi ) Dn s tng ng theo BOD5 :NOStdNBODbv bv TS TSt bia bianQ L Q L Q L . . . + +=30225 30 3645 100 2500 100 x x x + += 21892 (ngi) Dn s tnh ton theo BOD20 :NBOD = N + BODtdN = 3500000 + 21892 = 371892 (ngi)4. Xc nh mc cn thit x l nc thi: la chn phng php v cng ngh x l nc thi thch hp m bo hiu qu x l t tiu chun x vo ti thy li loi B (QCVN 08/2008 )vi cc yu cu c bn- Hm lng cht l lng SS 50 mg/l- Nhu cu oxy sinh hc BOD5 15 mg/l Mc cn thit x l nc thi thng c xc nh theo :- Hm lng SS phc v cho tnh ton cng ngh x l c hc.- Hm lng BOD5 phc v cho tnh ton cng trnh v cng ngh x l sinh hc Mc cn thit x l nc thi theo cht l lng c tnh theo cng thc:Ess = % 100 .CC Cvsstnssvss = % 100 .48 , 28050 48 , 280 = 82,17 (%)Trong : vssC- hm lng cht l lng ca hn hp nc thi. tnssC- hm lng cht l lng ca ngun tip nhn. Mc cn thit x l nc thi theo BOD5 :SVTH:Cao Vn Cnh- Lp 07MT2 Trang 9 Vn chuyn n XL N c Th i GVHD:T.S.Tr n V n QuangEBOD = % 100 .LL LvBODtnBODvBOD = % 100 .21 , 16215 21 , 162 =90,75 (%)Trong : vBODL- hm lng BOD20 ca hn hp nc thi. tnBODL- hm lng BOD20 ca ngun tip nhn.Kt qu tnh ton v mc cn thit x l nc thi trn cho thy cn thit phi x l sinh hc hon ton.5. La chn cng ngh ca trm x lDa vo:- Cng sut ca trm x l.- Thnh phn v c tnh ca nc thi.- Mc cn thit x l nc thi.- Tiu chun x nc thi vo cc ngun tip nhn tng ng.- Phng php x dng cn.- iu kin mt bng v c im a cht thy vn khu vc xy dng trm x l nc thi.- Cc ch tiu kinh t k thut khc.Chn cng ngh x l nh sau: X l c hc:- Ngn tip nhn.- Song chn rc.- B lng ct + sn phi ct- B lng ly tm t I X l sinh hc- Aeroten (vi sinh vt l lng bn hot tnh)- B lng ly tm t II. X l cn:- B nn bn ng.- B mtan.- Lm ro nc sn phi bn.Kh trng v x nc sau x l ra sng h dng cho mc ch ti tiu thy li- Kh trng nc thi.- Mng trn vch ngn c l.S dy chuyn cng ngh:SVTH:Cao Vn Cnh- Lp 07MT2 Trang 10 Vn chuyn n XL N c Th i GVHD:T.S.Tr n V n Quang6. Thuyt minh phng n cng nghSVTH:Cao Vn Cnh- Lp 07MT2 Trang 11Nc thiVn chuynB mtanSn phi bn Vn chuynBin loi BCp khNgn tip nhn B lng ly tmt IIB tip xcMng trnBn dBn tun honCn tiB nn cnvn chuynSong chn rcCtSn phi ctB lng ct ngangB lng ly tmt IAerotenClo n XL N c Th i GVHD:T.S.Tr n V n Quang phng n ny .nc thi t h thng thot nc ng ph c my bm trm bm nc thi n trm x l bng ng dn n ngn tip nhn Rc c gi li song chn rc v vn chuyn i ni khc x l ,cn nc thi c tch tip tc a n b lng ct . y , thit k b lng ct ngang nc chy thng m bo hiu qu lng ct v cc cn ln . Sau 1 thi gian ct lng t b lng ct c a n sn phi ctNc thi sauu khi qua b lng ct c a n b lng ly tm t I , ti y cc cht khng ha tan trong nc thi nh cht hu c c gi li . Cn lng c a n b meetan ln men . Nc thi tip tc i vo b Aroten v b lng ly tm t II. n nh nng bn hot tnh trong b Aroten gip tng hiu qu x l , nt lng bn hot tnh d c a qua b nn bn gim dung tch , sau da qua b mtan.Sau b lng t II hm lng cn v BOD trong nc thi m bo yu cu x l ,xong vn cn cha mt lng nht nh cc vi khun gy hi nn ta phi kh trng trc khi x ra ngun .Ton b h thng thchin nhim v ny gmtrm kh trng , mng trn . Sau cc cng on nc thi c x ra ngun tip nhn. Ton b lng bn cn ca trm x l sau khi ln men b meetan a ra sn phi bn lm kh dn mt m nht nh . Bn cn sau c dung cho mc ch nng nghip III. TNH TON CNG NGH X L NC THI:1. Ngn tip nhn nc thi: Nc thi c bm theo ng ng p lc n ngn tip nhn ca trm x l. Ngn tip nhn c t v tr cao nc thi t c th t chy qua ng cng trnh n v ca trm x l.Da vo lu lng tnh ton c xc nh,q = qmax,h + qhl = 3513,542 +9,49 = 3522,49 m3/h , Vi qhl = 9,49 m3/h : Lng nc hi lu t sn phi ct Kch thc ca ngn tip nhn nc thi trang 111 X l nc thi th v cng nghip Lm Minh Trit , chn 2 ngn tip nhn vi thng s mi ngn nh sau : ng ng p lc t trm bm dn mi ngn tip nhn : 2 ng vi ng knh mi ng d = 600 mmKch thc ca ngn tip nhn nh sau:Lu lngnc thiQ ( m3/h)ng knh ng p lc,d (mm)Kch thc ca ngn tip nhn2 ng A B H H1h h1b3522,49 600 2800 2500 2000 1600 750 900 800SVTH:Cao Vn Cnh- Lp 07MT2 Trang 12 n XL N c Th i GVHD:T.S.Tr n V n QuangCu to ca ngn tip nhn nh sau :Mng dn nc thi t ngn tip nhn ti cc cng trnh tip theo c tit din hnh ch nht. Kt qu tnh ton thu lc mng dn nc thi sau ngn tip nhn:( Bng 35 tit din hnh ch nht B = 800 mm ,Cc bng timhs ton thy lc cng v nng thot nc GS.TS.Trn Hu Uyn )Thng s thu lc Lu lng tnh ton, L/s q = qtb +qhl= 661,17 + 2,63 = 663,8q = qmax + qhl = 976 + 2,63 = 978, 63q = qmin + qhl = 241,54 + 2,63 = 244,17 dc i 0,0008 0,0008 0,0008Vn tc v ( m/s) 0,87 0,93 0,71 y h/B (m) 1,1 1,7 0,54B rng (mm) 800 800 800Chiu cao lp nc (m) 0,88 1,36 0,432Cu to mng dn nh hnh sau :SVTH:Cao Vn Cnh- Lp 07MT2 Trang 13BbhANgn tip nhnHNc thi voNgn tip nhnMng d n ncNc thi voBNgn tip nhnMng dn nc16601360800Mng dn nc n XL N c Th i GVHD:T.S.Tr n V n QuangChiu cao xy dng mng : H = hmax + hbv (m)trong : hmax l chiu cao lp nc ln nht trong mnghmax = 1,36 mhbv l chiu cao bo v,hbv = 0,3 m Chiu cao xy dng mng H = 1,36 + 0,3 = 1,66 (m)2.Tnh ton song chn rc:Chn 2 song chn rc trong 1 song chn lm vic, 1d phng.Chn mng dn nc thi mi song chn rc l mng c tit din hnh ch nht , c cc kch thc cng nh cc thng s k thut nh mng dn nc thi t ngn tip nhn n song chn rcS cu to nh hnh v :L3LpL1htL5BsL4 L2hhs>20SVTH:Cao Vn Cnh- Lp 07MT2 Trang 14 n XL N c Th i GVHD:T.S.Tr n V n Quang Chiu cao lp nc song chn rc ly bng chiu cao lp nc ca mng dn nc h = hmax = 1,36 m S khe h ca song chn rc:n = kh b vqs maxmax = 05 , 136 , 1 016 , 0 93 , 097863 , 0 = 50,78 = 51 ( khe )Trong :n - l s khe h qmax - lu lng ln nht giy: qmax = 0,97863 (m3/s)vs - tc nc chy qua song chn: vs = 0,93 (m/s)b - khong cch gia cc khe h b = 16 mm = 0,016 m ( TCVN 51/2008 mc 7.21 )k - h s tnh n mc cn tr ca dng chy do h thng co rc, k = 1,05 Chiu rng ca song chn rc c tnh theo cng thc sau Bs = s(n +1) + (b.n) = 0,008(51+1)+(0,016.51) = 1,23 (m)Trong : s l b dy ca thanh song chn rc, thng ly 0,008m. Kim tra vn tc dng chy phn m rng ca mng trc song chn ng vi qmin khc phc kh nng lng cn ti , vn tc ny phi ln hn 0,4 m/s :vmin = minminh Bqs =432 , 0 23 , 124417 , 0= 0,46 (m/s) tha mn.Trong qmin l lu lng nh nht chy qua song chn rc.Vy ti y cn khng th lng . Tn tht p lc song chn rc :hs = gK v. 2..12max(m)Trong : vmax vn tc ca nc thi trc song chn rc ng vi ch qmax.Kl h s tnh n s tng tn tht do vng mc rc song chn. K = 2-3 ,chn K1 = 3. - h s sc cn cc b ca song chn rc: =628 , 0 ) 60 sin( .016 , 0008 , 0. 83 , 1 ) sin( . .4343 ,_

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lb - h s phc thuc vo tit din ngang ca thanh song chn.Tra bng 3-7 Trang 116 X l nc thi th v cng nghip Lm Minh Tritchn = 1,83. - gc nghing ca song chn so vi hng dng chy = 600. hs = 0,628.81 , 9 . 23 . 93 , 020,08 (m) Chiu di phn m rng trc thanh chn rc L1 vi gc m rng ca mng l 200SVTH:Cao Vn Cnh- Lp 07MT2 Trang 15 n XL N c Th i GVHD:T.S.Tr n V n QuangL1 = 020 2tgB Bm s = 364 , 0 . 28 , 0 23 , 1 = 0,6 (m)Vi Bm= 0,8 m : Chiu rng mng dn Bs = 1,23 m : Chiu rng ca song chn rc Chiu di phn m rng sau thanh chn rc L2L2 = 21L = 26 , 0 = 0,3 m Chiu di phn mng m rng t song chn rc Ls = 1,5m Vy chiu di xy dng l :L = L1 + L2 + Ls = 0,6 + 0,3 + 1,5 = 2,4 (m) Chiu cao xy dng t song chn rc Hxd = hmax + hs + 0,5 = 1,36 + 0,08 + 0,5 = 1,94 m Trong : hbv = 0,5 m :Khong cch gia ct sn nh t song chn rc v mc nc cao nht hmax = 1,36 m : Chiu cao lp nc trong mng dn ng vi lu lng ln nht hs = 0,08 m :Tn tht p lc ca song chn rc Khi lng rc ly ra trong mt ngy m t song chn rc:Wr = 1000 365llN a= 1000 365372042 8 = 8,15 (m3/ng)Trong : a - lng rc tnh cho u ngi trong nmVi chiu rng khe h ca cc thanh trong khong 1620mm, a = 8 L/ng.nmNll dn s tnh ton theo cht l lng., N = 372042 ngi Trng lng rc ngy m:P = Wr G = 8,15 750 = 6112,5 (Kg/ng) = 6,1125 (T/ng)Trong : G :Khi lng ring ca rc ,G = 750 kg/m3 ( iu 6.14 Trang 29 TCVN 51/2008 ) Trng lng rc tng gi:Ph = hKP24 = 2241125 , 6=0,51 (T/h )Vi : Kh h s khng iu ha gi ca rc, ly bng 23. Tnh ton b lng ct:a) Nhim v: b lng ct ngang c thit k loi b cc tp cht v c khng ha tan nh ct si, x, v cc vt liu rn khc c trng lng ring ln hn cc cht hu c c th phn hy trong nc thi nh v trng, dm bo, v ht v rc thc phm nghin. Vic tch loi khi nc thi cc tp cht ny rt cn thit trnh nhng nh hng xu n hiu sut lm vic ca cc cng trnh pha sau.b) Kt qu tnh ton thu lc mng dn nc thi n b lng ct (ging mng dn n song chn rc) :Thng s thu lcLu lng tnh ton, L/s SVTH:Cao Vn Cnh- Lp 07MT2 Trang 16 n XL N c Th i GVHD:T.S.Tr n V n Quangq = qtb +qhl= 661,17 + 2,63 = 663,8q = qmax + qhl = 976 + 2,63 = 978, 63q = qmin + qhl = 241,54 + 2,63 = 244,17 dc i 0,0008 0,0008 0,0008Vn tc v ( m/s) 0,87 0,93 0,71 y h/B (m) 1,1 1,7 0,54B rng (mm) 800 800 800Chiu cao lp nc (m) 0,88 1,36 0,432c) Tnh ton: Chiu di b lng ngang c tnh theo cng thc sau:L = 0max1000UxH xKxVn 2 , 241 3 , 0 3 , 1 1000 x x xm)Trong : Vmax- tc chuyn ng ca nc thi b lng ct ngang ng vi lu lng ln nht, Vmax = 0,3m/s ( iu 7.33 TCVN 51/2008 Trang 40 ) H = 1 m : su tnh ton trong b lng ct (iu 7.33 TCVN 51/2008 Trang 40 ) , th H = 0,25- 1m , chn H =1 m U0 : Kch thc thy lc ca ht ct ( Bng 7-5 TCVN 51/2008 Trang 39 )K :H s t l ( Bng 7-6 TCVN 51/2008 Trang 39 ) K = 1,3 ng vi U0 = 24,2 mm/s, K = 1,7 ng vi U0 = 18,7 mm/sTheo phng n ang xt ,cn t b lng t I s c x l b mtan bng qu trnh sinh hc k kh , do nhim v ca b lng ct l phi loi b c ct c c ht d = 0,25 mm trnh nh hng n qu trnh x l sinh hc k kh .Khi U0 = 24,2 mm/s Din tch mt ct t ca b tnh theo cng thc:F= N Vqs.maxmax= 2 . 3 . 097863 , 0= 1,63 (m2) Trong : qmax = 0,976 + 0,00236 = 0,97863 m3/s: Lu lng ln nht tng cng ca nc thi N = 2 : S n nguyn lm vic trong trm x l nc thi Chiu ngang tng cng b lng ct:B =HF = 163 , 1 = 1,63 (m) Chn b lng ct ngang gm 3 n nguyn, trong 2 n nguyn cng tc v 1 n nguyn d phng, chiu ngang mi n nguyn:b = 1,63 (m) Th tch phn nn cn ca b lng ct ngang c tnh theo cng thc sau:Wc = 1000T P Nll = 10001 02 , 0 372042 = 7,44 (m3)Trong : P - lng ct gi li trong b lng ct cho 1 ngi trong mt ngy m, theo iu 7.34 TCVN 51/2008 ng vi h thng thot nc ring hon ton SVTH:Cao Vn Cnh- Lp 07MT2 Trang 17 n XL N c Th i GVHD:T.S.Tr n V n QuangP = 0,02 l/ngi.ng. T - chu k x ct : T 2 ngy m, m bo cho cn ct khng kp phn hy, chn T = 1 ngy m. Nll dn s tnh ton theo cht l lng.N =372042 ngi Chiu cao lp ct trong b lng ct ngang trong mt ngy m:hc = N b L cW = 2 63 , 1 1644 , 7 = 0,14 (m) Chiu cao xy dng ca lng ct ngang:Hxd = H + hc + 0,5 = 1,36 + 0,14 + 0,5 = 1,9 (m) Trong : hmax = 1,36 m Chiu cao lp nc c trong b lng ct ng vi lu lngln nht hbv = 0,4 m Khong cch t mc nc n thnh b * Kim tra li tnh ton vi iu kin vmin 0,15 m/svmin = minmin2 h bq = 432 , 0 63 , 1 224154 , 0 = 0,17 0,15 m/sTrong hmin = 0,432 m :Chiu cao lp nc trong b lng ct khi lu lng nc thi l nh nhtCt b lng ct c gom v h tp trung u b lng bng thit b co c gii, t thit b nng thu lc s a hn hp ct - nc n sn phi ct. dn ct n sn phi ct bng thit b nng thy lc ,cn pha long ct vi nc thi sau x l vi t l 1:20 theo lng ct - Nc cng tc do my bm vi p lc 2- 3 at- Thi gian mi ln x ct di 30 pht - m ca ct : 60%- Trng lng th tch ca ct : 1,5 T/m3 Lng nc cn thit cho thit b nng thu lc Qct = Wc 1,5 20 = 7,44 1,5 20 = 223,2 (m3/ng) = 9,3 m3/hd) Tnh ton sn phi ct:Ct sau khi ra khi b lng ct ngang c cha mt lng nc abgs k , do cn lm ro ct ( tch nc ra khi ct ) d dng vn chuyn i ni khc . Qa trnh ny c din ra ti sn phi ct Din tch ca sn phi ct c tnh theo cng thc:F = hP Nll 1000365 = 5 1000365 02 , 0 372042 = 543,2 (m2 )Trong : P lng ct tnh theo u ngi, P = 0,02 (l/ngi.nm)Nll dn s tnh ton theo cht l lng.h chiu cao lp bn ct trong nm, h = 45 m/nm.Chn sn phi ct gm 4 , din tch mi bng 543,2 : 4 = 136 (m2). Kch thc mi trong mt bng: 10 m x 13,6 m. Lng nc c trong ct l :SVTH:Cao Vn Cnh- Lp 07MT2 Trang 18 n XL N c Th i GVHD:T.S.Tr n V n Quang Qnc = 60%.Wc = 0,6 . 7,44 = 4,46 (m3/ng )Tng lng nc hi lu v u trm x l bng tng lng nc sch dung khi cn pha long ct vi nc thi x ct bng thit b nng thy lc v lng nc c trong ct Qhl = Qnc +Qct = 4,46 + 223,2 = 227,66 ( m3/ng ) = 9,49 ( m3/h ) = 2,63 ( l/s )4. Thit b o lu lng: m bo cho cc cng trnh x l nc hot ng t hiu qu, ta cn bit lu lng nc thi chy vo tng cng trnh v s dao ng lu lng theo cc gi trong ngy. xc nh lu lng nc ta dng mng Parsal. Kch thc mng c nh hnh theo tiu chun v c chn tu thuc vo lu lng nc.Vi gi tr lu lng tnh ton ca trm l: qmax= 976 + 2,63 = 978,63 l/s qtb = 661,17 + 2,62 =663,8 l/sqmin = 241,54 + 2,63 = 244,17 l/s.Theo bng 3-37 trang 230 Gio Trnh X l nc thi th v cng nghip-Lm Minh Trit, ta chn mng Parsal c cc kch thc sau:b A B C1 C2 L1 L2 L3 W7,5cm 108 cm 50 cm 120 cm 120 cm 145 cm 60 cm 90 cm80 cm5. B lng ly tm t I:a) Nhim v: b lng t I c nhim v loi b cc tp cht l lng cn li trong nc thi sau khi qua cc cng trnh x l trc . y, cc cht l lng c t trng ln t trng ca nc s lng xung y, cc cht l lng c t trng nh hn t trng ca nc s ni ln trn mt nc v s c thit b gt cn tp trung n h ga t bn SVTH:Cao Vn Cnh- Lp 07MT2 Trang 19BL1L2 L3A WES mng ParsalMT BNG n XL N c Th i GVHD:T.S.Tr n V n Quangngoi b. V cng sut ca trm ln nn chn b lng ly tm s cho hiu sut cao hn, tn t din tch t v c th va lm vic va x cn. GHI CH 1. ng dn nc2. H thu cn3. Vch ngn hng dng4. Mng thu nc vng5. Tm ngn cht ni6. Lan can cng tc7. Thanh gt cht ni8. Thanh gt bn

B lng ly tmb) Tnh ton: Th tch tng cng ca b:Wlg = qlg x t = 3523,03 x 1,5 = 5284,55m3Trong : qlg= qmax,h + qctqmax,h: Lu lng trung bnh gi.qct : Lu lng nc sch dng pha long ct vn chuyn ct bng thit b nng thy lc(m3/h ) t thi gian lng ca b, thng ly bng 1,5h. qlg = 3513,542 + 9,49 = 3523,03 (m3/h )Chn 3 b lm vic v mt b d phng, th tch mi b l:52 , 1761355 , 52843 WWb m3 Din tch mi b trong mt bng :SVTH:Cao Vn Cnh- Lp 07MT2 Trang 2014567832 n XL N c Th i GVHD:T.S.Tr n V n Quang F = 8 , 352 , 1761HWb = 464 m2 Trong : H chiu su vng lng ca b lng ly tm (1,5 5m). T l gia ng knh D v chiu su vng lng ly trong khong t 6 n 12,( iu 7.60 mc b Trang 49 TCVN 51/2008 ) chn H = 3,8m. ng knh mi b :D = 14 , 3464 4 4 F = 24,3 ,chn D = 25mKim tra:6 , 68 , 325 HD tha mn (quy phm 6) 12 ng knh ca ng trung tm: d = 15%D = 0,15. 25 = 3,75 m Ta c tc lng ca ht cn l lng trong b lng l :s mmtHU / 7 , 05 , 1 . 6 , 38 , 3. 6 , 310 T U Tra bng 3-10 Trang 129 Sch Lm Minh Trit ,ta suy ra c hiu sut lng E = 48 % Vy hm lng cht l lng tri theo nc ra khi b lng ly tm t I hay l hm lng cht l lng c trong nc thi sau khi i qua b lng ly tm l :C1 = Ctc x ( 100- 48 )% =280,48 x ( 100 - 48 )% = 145,85 ( mg/l )Theo quy phm nng cht l lng trc khi vo cng trnh x l sinh hc C < 150 mg/l, sau khi tnh ton C = 145.85 mg/l nn khng cn phi lm thong s b. Dung tch phn cha cn c tnh theo cng thc :Wc = n PT E C qtc. 1000 . ). 100 (. . .lg = 3 . 1000 . 1000 ). 95 100 (8 . 48 . 48 , 280 . 69 , 2389= 17,16 (m3)Trong : Ctc - Hm lng cht l lng trong hn hp nc thi sau b lng ct. qlg = qtb,h + qct = 2380,2 +9,49 = 2389,69 (m3/h ) : Lu lng ca dng thi vo bqtb,h :Lu lng trung bnh gi , qtb,h = 2380,2 (m3/h ) E - Hiu sut lng tng cng sau khi lng, E = 48%.T-Thi giantchlycn, xcgiiT=8h(iu7.59TCVN51/2008 Trang 48 ) P - m ca cn ti sau b lng t I, P = 95%.( iu 7.54 TCVN 51/2008 Trang 47n - S ngn cng tc, n = 3.Tc thanh gt bn ( 2- 3) vng/h ,chn 3 vng/hChn dc ca y b v pha h thu cn l i = 0,05 c ) Tnh ton mng thu nc thi ca b lng ly tm t IChiu di mng : L = x 2 x R = x 2 x 12,5 = 78,5 mSVTH:Cao Vn Cnh- Lp 07MT2 Trang 21 n XL N c Th i GVHD:T.S.Tr n V n QuangTa c :Qb =303 , 35233lgq= 1174,3 (m3/h ) = 326,2 l/sChn mng trn c b rng B = 600 mmTi trng ca mng trn u = 25 .2 , 326. DQb= 4,15 l/m.s < 10 l/m.s ( Theo iu 7.59 TCVN 51/2008 Trang 49 ) Chiu cao xy dng b:HXD = Hbv + H + Hth + Hc Trong : Hbv - chiu cao bo v Hbv = 0,4 mH - chiu cao cng tc ca b H = 3,8 (m)Hth - chiu cao lp nc trung ho ca b Hth = 0,3 (m).Hc - chiu cao lp bn trong b lng, Hc = 0,5 (m) HXD = 0,4 + 3,8 + 0,3 + 0,5 = 5 m6. B Aerotan:a) Gii thiu:nc thi sau x l b lng t I c dn n cng trnh x l sinh hc: Aeroten - Qu trnh bn hot tnh vi sinh vt l lng. b) Tnh ton:Cc thng s u vo b lc sinh hc Aroten Lu lng tnh ton: Qtt = QI +QII Nc t b lng I sang ( K c lng nc sch pha long ct ) QI = 57125 + 227,66 = 57352,66 (m3/ng ) = 2389,69 ( m3/h ) Nc t b lng II sang : QII = 597,42 ( m3/h )Tng cng :Qtt = 2389,69 + 597,42 = 2987,11 ( m3/h )Xc nh thi gian lm vic ca cc ngn Aroten- Thi gian np kh trong b aeroten tnh theo cng thc:t0 = ( ).. 1 . Tr a RL LRt a(h)Trong : La BOD5 ca nc thi vo, La = 162,21 mg/l.Lt BOD5 ca nc thi sau x l, Lt = 15 mg/l. R :T l tun hon bn , xc nh nh sau : ( iu 7.126 TCVN 51/2008 )3150100031000aIaR= 0,8 Tr : tro ca bn ,Tr = 0,3 ( Theo TCVN 51/2008 Bang 7-25 Trang 66 : Tc oxy ha trung bnh ca cht bn tnh bng mg BOD5 ca mt gam cht khng tro ca bn trong mt gi, =max. a L K C K C LC Lt l tt. 11..0 0 . 0 .0 . + + +SVTH:Cao Vn Cnh- Lp 07MT2 Trang 22qtb,h _ a n XL N c Th i GVHD:T.S.Tr n V n Quanga-liulngbntnhtheocht kh=atb,a=3(g/l).(iu7.126TCVN 51/2008 Trang 65 )max :Tc xy ha ring ln nht( mgBOD5/g cht kh khng tro ca bn ) trong 1h , max = 85C0 : Nng xy ha tan cn thit phi duy tr trong Aroten ,C0 = 2 ( mg/l ) K1 : Hng s c trng cho tnh cht ca cht bn hu c trong nc thi , K1 = 33 ( mgBOD5/l )K0 : Hng s k n nh hng ca xy ha tan ,K0 = 0,625 ( mg02/l )

: H s k n s km hm qu trnh sinh hc bi cc sn phm phn hy bn hot tnh ( l/h )( Bng 7-25 Trang 66 TCVN 51/2008 ), = 0,07 =85.3 . 07 , 0 11.15 . 625 , 0 2 . 33 2 . 152 . 15+ + + = 20 ( l/h ) Ra:Liu lng bn hot tnh trong ngn ti sinh (g/l) ,c xc nh nh sau :aR = 875 , 4 ) 18 , 0 . 21(. 3 ) 1. 21( + +Ra (g/l )Vy :t0 = .20 ). 3 , 0 1 .( 875 , 4 . 8 , 015 21 , 162= 2,7 ( h )Thi gian thi kh trong ngn Aroten ta = taLLalg .5 , 225 , 0=1521 , 162lg .35 , 225 , 0= 2 ( h )Theo iu 7.126 TCVN 51/2008 Trang 65 th thi gian np kh trong mi trng hp khng nh hn 2 gi tha mn. Thi gian cn thit ti sinh bn hot tnhts = t0 - ta = 2,7- 2 = 0,7 ( h )* Th tch Aroten : Th tch ca Aroten :Wa = ta. (1 +R ).Qtt = 2. (1 + 0,8 ). 2987,11 = 10754 ( m3 ) Th tch ca ngn ti sinh :Wts = tts. R .Qtt = 0,7. 0,8. 2987,11 = 1673 ( m3 ) Tng Th tch ca Aroten :W = Wa + Wts = 10754 + 1673 = 12427 (m3 )* Tnh lu lng nc hi lu v aeroten:SVTH:Cao Vn Cnh- Lp 07MT2 Trang 23qtb,h _ a n XL N c Th i GVHD:T.S.Tr n V n Quangqtb,h .a + qhl.ahl= (qtb,h + qhl).aa qhl . 2 = (qtb,h + qhl). 10=> qhl = h tbq,41=0,25 . 2389,69 = 597,42 m3/hTrong : qhl - lu lng nc hi lu v b aeroten.a - nng bn trong dng nc thi vo, a0 ahl - nng bn hi lu, Lhl = 10 g/laa - nng bn duy tr trongb aeroten, La = 2 g/lCng sut trm x l > 50000 m3/ng nn s b aeroten lm vic ly N = 8 b (theo iu 7.137 TCVN 51/2008 Trang 69 ). Theo iu 7.130 TCVN 51/2008 Trang 67 chiu su lm vic ca b H = (3 6)m, ta chn H = 3m, b rng ca mi hnh lang b = 3m (b < 2H).Ta c t l : 156 , 0107541673WWats S hnh lang ca mi ca b n = 4. Chiu di tng cng ca b c xc nh theo cng thc: L = H.bWa= 3 . 310754= 1195 (m) Chiu di ca mi hnh lang l: l = N nL.= 8 . 41195 38(m).Qui phm (l 10b ) Kch thc ca mi b: B x l x H= 12 x 38 x 38Chiu cao xy dng ca b : Hxd = H + Hbv = 3 + 0,8 = 3,8 (m)V tnh cht nc thi c nhiu cht hot ng b mt nn khi sc kh to rt nhiu bt ni ln, m bo an ton khi s dng chn chiu cao bo v Hbv = 0,8m [qui phm Hbv = (0,8 1,2) m ] * Tnh ton h thng cp khV chc nng b l lm thong hon ton nn chn h thng lm thong to bt kh mn. Lu lng ring ca khng kh (D):D = ) C C .( n . n . K . K) L L .( Zp 2 1 2 1t a= ) 2 87 , 50 .( 77 , 0 . 98 , 0 .. 08 , 2 . 2) 15 21 , 162 .( 1 , 01= 1,06 (m3/m3)SVTH:Cao Vn Cnh- Lp 07MT2 Trang 24(qhl,h+qtb,h ) aaqtb,h _ a Aeroten Lng IIqhl,h _ ahl n XL N c Th i GVHD:T.S.Tr n V n QuangTrong : Z - lu lng oxy n v lm sch 1mg BOD5, lm sch hon ton, Z = 1,1 mgO2/mg.BOD5 ( iu 7.135 Trang 68 TCVN 51/2008 )K1 - h s k n kiu thit b np kh,theo bng 7-26 TCVN 51/2008 ta chn t s din tch vng thi kh f v din tch b F l t s f/F = 0,5 ng vi Jmax = 50m3/m2.h th K1 = 2.K2- h s ph thuc vo su t thit b np kh, theo bng 7-27 TCVN 51/2008, chn h = 3m khi Jmin = 4 m3/m2.h v K2 = 2,08.n1 - h s tnh n nh hng ca nhit ca nc thi, xc nh theo cng thc: n1 = 1 + 0,02.(ttb 20) = 1 + 0,02.(19 - 20) = 0,98. Vi: ttb - nhit trung bnh trong thng ma h, ttb = 190C.n2 -h s tnh n quan h gia tc ha tan ca oxy ca hn hp nc v bn vi tc ha tan ca oxy trong nc sch, gi tr ly theo bng 7-28 TCVN 51/2008vi f/F = 0,5th n2 = 0,77.Cp - ha tan ca oxy khng kh trong nc, c xc nh theo cng thc: Cp = Ct.

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+6 , 20h1= 44,4.

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+6 , 2031= 50,87 mg/lVi: Ct - ha tan oxy trong nc, ph thuc vo nhit v p sut.Theo bng 3-33 Trang 217 sch X l nc thi th v cng nghip ng vi nhit 190C th Ct = 44,4 mg/l.C - nng trung bnh ca oxy trong aeroten, ly bng 2 mg/l.(TCVN 51/2008 Trang 69 ) Cng cp kh c tnh theo cng thc: J = tH . D= 23 . 06 , 1= 1,59 (m3/m2.h)So snh J vi Jmaxv Jmin ta thy J = 1,59 < Imin= 4 m3/m2.h, nh vy cn phi tng thm lu lng khng kh t c cng Imin. Khi : D = Ht J .min= 32 . 4= 2,67 (m3/m3) Lu lng khng kh cn cung cp l: V = D.qtb,h = 2,67.2987,11= 7976 (m3/h)Trong : qtb,h = 2987,11 ( m3/h ) :Tng lu lng tnh ton cho b ArotenKhi chn thit b phn tn khng kh dng to bt kh nh thng s dng cc tm xp. S lng cc tm xp c tnh theo cng thc:N = dV. 601000 .= 100 . 601000 . 7976= 1330 tm Trong :d - lu lng n v khng kh, i vi tm xp c kch thc 0,30,30,04md = (80 120) l/pht. Chn d = 100 l/pht.Ta c 8 n nguyn, mi n nguyn c 3 hnh lang (2 hnh lang ca aeroten v 2 hnh lang ti sinh bn). Nh vy s, lng tm xp mi hnh lang:n = 3 . 8N= 4 . 81330= 42tm SVTH:Cao Vn Cnh- Lp 07MT2 Trang 25 n XL N c Th i GVHD:T.S.Tr n V n QuangCc tm xp c b tr thnh 2 hng, mi hng gm: 42 : 2 = 21 tm v mi hng cch nhau 2,5m.Chiu di ca mi ngn l = 38m, cc tm xp t cch nhau mt khong:l1 = 38:(21 + 1) = 1,73 m Hiu sut lngca b Aroten thng t 70% nn nng cht l lng sau khi i qua bl :C2 = C1 x ( 100-70 )% = 145,86 x (100 70 )% = 43,755 ( mg/l )7. B lng ly tm t II:a) Nhim v: b lng t II lm nhim v lng hn hp nc bn t b aeroten dn n v bn lng y c gi l bn hot tnh.S liu tnh ton b lng ly tm t II ly theo iu 6.5.6 v 6.5.7 TCN- Thi gian lng ng vi qmax v vi x l sinh hc khng hon ton: t = 1h.- Hm lng cht l lng tri theo nc ra khi b lng t II ng vi BOD20 sau x l (35 mg/l) l 48,6 mg/l.b) Tnh ton: Th tch tng cng ca b:W = (qmax,h + qhl).t = ( 3513,542 + 631,34).2 = 8289,76 (m3)Trong :qhl :Tng lu lng nc hi lu v b lng II qhl=qm + qc + qspb = 13,28 + 9,49 + 11,15 + 597,42 = 631,34 ( m3/h ) Chn 3 b lm vic v 1 b d phng, khi th tch mt b:25 , 2763376 , 82893 WWb (m3) Chn ng knh ca b lng t II bng ng knh ca b lng t I, D = 25m. Din tch mt bng mi b lng:6145 , 425 , 27635 , 4 bWF m2Trong : H chiu su vng lng ca b lng ly tm (1,5 5m). T l gia ng knh D v chiu su vng lng ly trong khong t 6 n 12,( iu 7.60 mc b Trang 49 TCVN 51/2008 ) chn H = 4,5m. ng knh mi b :D = 14 , 3614 4 4 F = 28 mKim tra:2 , 65 , 428 HD tha mn (quy phm 6) 12 Chiu su vng lng ca b lng:FWHb=32 , 6601 , 1912 (m) Kim tra:7329 HD (quy phm 6) 12 SVTH:Cao Vn Cnh- Lp 07MT2 Trang 26 1- ng trung tm2- ng x cn 4- Sn cng tc 3- Ming loe n XL N c Th i GVHD:T.S.Tr n V n Quang ng knh ca ng trung tm: d = 15%D = 15%.28 = 4,2 mChn dc ca y b v pha h thu cn l i = 0,03 theo iu 7.60 TCVN 51/2008 Th tch phn cha bn ca mi b lng (Wc):Wc = N PT q q C Ch hl h tb b). 100 .( 10100 . ). ).( (6, , 2+ = 3 ). 4 , 99 100 .( 10100 . 2 ). 34 , 631 2 , 2380 ).( 12 160 (6+ = 50 (m3)Trong : Cb hm lng bn hot tnh trong nc ra khi aeroten, Cb = 160 mg/l.C2 - hm lng cht l lng tri theo nc ra khi b lng t II, theo bng 7-15 tcvn 51/2008,ta c C2 = 12 mg/l.T - thi gian gia hai ln x cn, sau aeroten T 2 gi chn T = 2 gi. P - m ca bn hot tnh, P = 99,4% ( iu 7.144 TCVN 51/2008 Trang 70) Chiu cao xy dng b:HXD = Hbv + H + Hth + Hc Hbv: chiu cao bo v Hbv = 0,4 mH: chiu cao cng tc ca b H = 4,5 (m)Hth: chiu cao lp nc trung ho ca b Hth = 0,3 (m).Hc: chiu cao lp bn trong b lng, Hc = 0,5 (m)

HXD = 0,4 + 4,5 + 0,3 + 0,5 = 5,7 m8.B nn bn:a) Nhim v: b lng t II, bn c m cao (99% 99,4%). Mt phn ln loi bn ny c hi lu tr li Aeroten (bn hot tnh), lng bn cn li gi l bn hot tnh d c dn sang b nn bn nh p lc thy tnh trong b. Nhim v ca b nn bn l lm gim m ca bn hot tnh d bng cch lng (nn) c hc gim m thch hp (94% 96%) phc v cho vic x l bn bng qu trnh phn hy k kh b mtan.Do s l sinh hc hon ton nn s dng b nn bn kiu nn ng, hn hp bn sau khi nn c m 98%, thi gian nn l 10 gi.( bng 7-29 TCVN 51/2008 )SVTH:Cao Vn Cnh- Lp 07MT2 Trang 27 1- ng trung tm2- ng x cn 4- Sn cng tc 3- Ming loe n XL N c Th i GVHD:T.S.Tr n V n Quang b) Tnh ton: Hm lng bn hot tnh d xc nh theo cng thc:Pr = 0,8C1 + 0,3La = 0,8.145,85 + 0,3.162,21 = 165,34 (mg/l) ( iu 7.134 TCVN 51/2008 Trang 67 )Trong : C1 - hm lng cht l lng sau b lng t I, C = 145,85 mg/l.La - hm lng bn hot tnh tri theo nc ra khi b lng t II, La = 162,21 mg/l.: BOD5 ca nc thi ban u Lng bn hot tnh cng dao ng theo ma nn hm lng bn d ti a l:Pr,max = K.Pr = 1,2.165,34 = 198,41 mg/l Vi: K = 1,151,2 l h s bn tng trng khng iu ha thng. Lng bn hot tnh ln nht a vo b nn bn t b lng II:qmax = dtcng rCQ P. 24.max ,= 10000 . 2466 , 57352 . 41 , 198= 47,41 m3/h.Trong : Pmax - tng sinh khi bn ln nht, Pr,max = 198,41 mg/l Qng - lu lng ngy m ca nc thi, Qng = 57125 + 227,66 = 57352,66 m3/ngCd - nng bn hot tnh d ph thuc vo c tnh ca bn.(iu 6.10.3 TCN- 51-84), Cd = at = 10000 mg/l. Lng nc tch ra ti a trong qu trnh nn bn:Qn = 22 1 maxP 100) P P .( q = 98 100) 98 4 , 99 ..( 41 , 47= 33,2 m3/h Din tch vng lng c tnh theo cng thc:SVTH:Cao Vn Cnh- Lp 07MT2 Trang 28 1- ng trung tm2- ng x cn 4- Sn cng tc 3- Ming loe1243B nn bn ng n XL N c Th i GVHD:T.S.Tr n V n Quang3600 .max1vqF = 69 , 1313600 . 0001 , 041 , 47(m2)Trong : qmax - lng bn a vo b nn.v - tc chuyn ng ca bn vng lng (v0,2mm/s), v = 0,1mm/s. ( Bng 7-29 TCVN 51/2008 Trang 72 ) Din tch ca ng trung tm:3600 .max2ttvqF = 53 , 03600 . 025 , 041 , 47(m2)Trong : vtt - vn tc chuyn ng ca bn trong ng trung tm ly khng qu 30mm/s, vtt = 25 mm/s (iu 7.60 mc c TCVN 51/2008 ). Din tch tng cng ca b nn bn:F = F1 + F2 = 131,69 + 0,53 = 132,22 (m2)Chn s b nn bn N = 4Din tch mi b nn l :. 4 4,F FF ng knh mi b nn bn:4 , 614 , 3 . 266 , 63 . 414 , 3 .. 4 NFD (m) (quy phm 49m) ng knh ng trung tm:6 , 014 , 3 . 251 , 0 . 414 , 3 .. 42 NFd(m) ng knh phn loe ca ng trung tm:d1 = 1,35. = 1,35.0,6 = 0,81 (m) ng knh tm chn:dc = 1,3.d1 = 1,3.0,81 = 1,053 (m) Chiu cao phn lng ca b nn bn:h1 = v.t.3600 = 0,0002.4.3600 = 3 (m)Vi t = 3h - thi gian nn bn. Chiu cao phn nn vi gc nghing 500 so vi phng ngang:3 5024 , 1 4 , 620 tg tgd Dhnn (m)Vi dn ng knh phn y hnh nn, ly dn = 0,6m. Chiu cao bn hot tnh nn:hb = hn - hs - hth = 3 - 0,5 - 0,3 = 2,2 (m)Trong : hs - khong cch t y ng loe ti tm chn, hs = 0,5m. hth - chiu cao lp nc trung ha, hth = 0,3m. Chiu cao xy dng ca b nn bn:Hxd = hl + h2 + hbv = 3,6 + 3 + 0,4 = 7(m)SVTH:Cao Vn Cnh- Lp 07MT2 Trang 29 n XL N c Th i GVHD:T.S.Tr n V n Quang9. B mtan:a) Nhim v: b mtan c thit k x l sinh hc k kh cc loi cn ti t b lng I, bn hot tnh sau khi nn.b) Tnh ton:* Xc nh lng cn dn n b mtan Lng cn tng cng dn n b mtan s l:W = IcW + Wb (m3/ng) Lng cn ti t b lng t I:IcW = 610 . ). 100 (. . .ctc ngPK E C Q = 1 . 10 ). 95 100 (1 , 1 .. 48 . 48 , 280 . 66 , 573526= 169,87 m3/ngTrong : Ctc - nng cht l lng ban u. Qng lu lng trung bnh ngy m.= 57125 +227,66 = 57352,66 (m3/ng )E hiu sut ca b lng t I.E = 48 %K - h s tnh n kh nng tng lng cn do c c ht l lng ln, K = 1,1 [ qui phm K = (1,1 1,2) ]P m cn.P = 95%c - trng lng th tch ca cn ti, c = 1. Lng bn hot tnh d:Wb=[ ]bng tcpQ C E C6210 ). 100 (. 100 ) 100 ( =[ ]48 , 4671 . 10 ). 98 100 (66 , 57352 .. 12 . 100 2 , 1 ) 48 100 ( 48 , 2806 m3/ngTrong : C2 - hm lng bn hot tnh tri theo nc ra khi b lng t II, C2 = 12 mg/l.- h s tnh n kh nng tng trng khng iu ha ca bn hot tnh trong qu trnh x l sinh hc, 25 , 1 15 , 1 , ly = 1,2.P : m ca bn hot tnh sau khi nn P = 98%b- trng lng th tch ca bn, b= 1. Lng cn tng cng dn n b mtan:W = 169,87 + 467,48 = 637,35 (m3/ng) m trung bnh ca hn hp cn c tnh theo cng thc:SVTH:Cao Vn Cnh- Lp 07MT2 Trang 301 - ng dn cn ti2 - ng dn cn chn3 - ng dn kh4 - Van kim trah1hcth2 1342DS cu to b mtan n XL N c Th i GVHD:T.S.Tr n V n QuangPhh = 100.1]1

W1k kB C= 100.1]1

+35 , 63735 , 9 5 , 81= 97,2%Trong : Ck - lng cht kh trong cn ti vi m P = 95%:Ck = 100) P 100 .( WIc= 100) 95 100 .( 87 , 169 = 8,5 m3/ngBk - lng cht kh trong bn hot tnh d vi m P = 95%:Bk = 100) 98 100 .( 48 , 467100) 100 .( Wb P= 9,35 m3/ng Khi lng cn kh trong b mtan:mc = 100) 2 , 97 100 .( 35 , 637100) P - W.(100hh = 17,85 m3/ng * Tnh ton b mtanKhi m ca hn hp cn Phh > 95% chn ch ln men m vi t = 30350C. Chn t = 330C. Dung tch b mtan c tnh theo cng thc sau:Wm = 10100 . 35 , 637dW.100= 6373,5 m3Trong : W - lng cn tng cng dn n b mtan, W = 637,35 m3/ngd - liu lng cn dn vo b mtan trong ngy m ph thuc vo ch ln men v m ca cn, ly theo 7-32 TCVN 51/2008, Ly d = 10% Chn s b mtan lm vic N = 3 v mt b d phng. Dung tch ca mi b:W1 = 6373,5 : 3 = 2124,5 m3 Kch thc c bn ca b mtan (ly theo kch thc thit k mu loi dung tch 2500m3 c tra theo bng 3-15 sch XLNT th v cng nghip)D = 17,5 m H = 8,5 mh1 = 2,5 m h2 = 3,03 m * Lng bn phn hy trong mt ngy m trong b meetan lng bn kh dduwowcj phn hy 50% m m bn khng thay i ,do ddos sau khi ra khi b meetan lng bn kh cn li l :m = 925 , 8217,85 ( T/ng ) m bn sau khi phn hy b meetan l khng i nn lu lng bn phan hy trong mt ngy mWP =2637,352W = 318,675Chn chu k x cn ca b meetan :T =1ngy/ln Dung tch phn cha cn ( phn chp y ca b )W = WP x T = 318,675 x 1 = 318,675 (m3 ) Lng nc tch ra t b mtan l :Wn = Wtc Wp = 637,35 318,675 = 318,675 ( m3/ng ) = 13,28 ( m3/h )SVTH:Cao Vn Cnh- Lp 07MT2 Trang 31 n XL N c Th i GVHD:T.S.Tr n V n Quang10. Sn phi bn:a) Nhim v: Cn sau khi ln men b mtan c m cao cn lm ro nc trong cn t c m cn thit thun li cho vic vn chuyn v x l tip theo. Chn sn phi bn thc hin qu trnh lm ro nc trong cn. Nhim v ca sn phi bn l gim m ca bn xung cn 7580%. b) Tnh ton sn phi bn:Tnh ton sn phi bn theo chu k x bn vo sn phi. Chn chu k x 20 ngy x 1 ln, sau 3 ln x bn vo sn phi s vn chuyn bn i. Sau khi ra khi b mtan lng cn gim 50%, nn lng cn t b mtan dn sang sn phi bn l:W = 50%W = 50%.637,35 = 318,675 (m3/ng)Vy lng cn n sn phi bn l :Wspb =Wmt = 318,675 (m3/ng)Tng lng bn chuyn n sn phi bn trong 60 ngy l :Wspb = 318,675.60 = 19121 (m3/ng) Din tch hu ch ca sn phi bn c tnh theo cng thc:F1 = 2549475 , 060 . 675 , 318h60 . Wspb m2Trong : h chiu dy lp bn, h = 0,75m. Sn phi bn c chia lm nhiu . Chn kch thc mi l 40 x 52 = 2080 m2. S s l:12208025494 n Din tch ph ca sn phi bn: ng s, mng, mng c tnh theo cng thc:F2 = k.F1 = 0,25.25494 = 6373,5 (m2)Trong : k h s tnh n din tch ph, k = 0,20,4, chn k = 0,25. Din tch tng cng ca sn phi bn:Fb = F1 + F2 = 25494 + 6373,5 = 31867,5 (m2) Lng bn phi t m 96% n m 75% trong 1 nm s l:Wb = Wspb.365.21P 100P 100= 318,675.365.75 10096 100= 18611 m3 Lng nc tch ra t sn phi bn:Qb = Wspb.75 10075 96. 675 , 31810022 1PP P= 267,7 m3/ng -11,15 (m3/h )Trong : P1 - m trung bnh ca cn sau khi ln men b mtan, P1 = 96%.P2 - m sau khi phi, P2 = 75%Chu k x bn vo sn phi bn dao ng t 20 30 ngy ty thuc nhiu yu t: tnh cht ca bn dn vo sn phi bn, kh nng thm ca t v ma nng ma trong nm. Nc t sn phi bn c thu gom bi h thng ng (D = 200mm) c c l t dc SVTH:Cao Vn Cnh- Lp 07MT2 Trang 32 n XL N c Th i GVHD:T.S.Tr n V n Quangtheo chiu di sn phi, ng thu nc t gia ngn bn. Cc ng ny dn nc v h thu gom v c bm tr li trc lng II. Bn x vo sn phi nh h thng ng dn bn t trn thnh sn phi bn.IV. B TR MT BNG TRM X L :1. Chn v tr xy dng trm x l nc thi Vic chn v tr xy dng trm x l nc thi da vo cc iu kin a hnh, thy vn, so snh cc ch tiu kinh t - k thut v m bo yu cu sau:- t cui hng gi ch o.- m bo khong cch cch ly v sinh (theo iu 1.16 TCN- 51-84)- Kt hp vi qui hoch chung ca khu vc v tnh ti kh nng m rng trong tng lai ca khu vc .- Tin li trong vn chuyn.2. Mt bng tng th v kch thc cc cng trnh ph:Vic qui hoch mt bng c thc hin sao cho t c cc ch tiu v qui hoch mt bng. Cc cng trnh chnh c u tin xy dng sao cho thun tin nht, cc cng trnh ph v cng trnh phc v c b tr trn din tch t cn li sao cho hp l.* Cng trnh chnhCng trnh chnh bao gm: ngn tip nhn nc thi, song chn rc, mng o lu lng, b lng ct, b lng ly tm t I,, b aeroten, b lng ly tm t II, b nn bn, b mtan, sn phi ct, sn phi bn.* Cng trnh ph v ph trBao gm: nh iu hnh ( 3010 )m, ng bao quanh v ng ni b (rng 7m), trm sa cha in my ( 2010 )m, trm bin p ( 106 )m, trm kh nn ( 12x10 )m, phng th nghim ( 1410 ), nh xe ( 157 )m, kho ( 12 x 10)m, nh bo v ( 44 )m.Xung quanh trm x l nc thi c trng cy xanh v hng ro bo v.3. Cao trnh theo ncMt ct theo nc c tnh bt u t ngn tip nhn nc thi qua cc cng trnh v thi ra bin. Tn tht p lc qua cc cng trnh s b c th ly nh sau:-Ngn tip nhn0,1m - Song chn rc 0,2m- B lng ct ngang 0,2m- Mng o lu lng0,3m- B lng ly tm t I 0,5m- B aeroten0,3m- B lng ly tm II 0,5mTn tht p lc trn cc mng mng tnh theo tn tht dc ng:ddH= i.lTrong : i - dc mngl - chiu di mng (m)Ta c bng tn tht dc ng nh sau:SVTH:Cao Vn Cnh- Lp 07MT2 Trang 33 n XL N c Th i GVHD:T.S.Tr n V n QuangTT Tn on mng I l Cng thc Kt qu (m)1 Ngn tip nhn - song chn rc 0,0008 6 H = 0,0008.6 0,0482 Song chn rc - b lng ct 0,0008 7 H = 0,0008.7 0,0563 B lng ct - mng o lu lng0,0008 5 H = 0,0008.5 0,044 Mng o lu lng h chia nc 0,0008 17 H = 0,0008.17 0,1365 H tp trung nc - aeroten 0,0008 15 H = 0,0008.15 0,126 Aeroten h chia nc 0,0008 15 H = 0,0008.15 0,127 H tp trung nc mng trn 0,0008 15 H = 0,0008.15 0,128 Mng trn b tip xc 0,0008 6 H = 0,0008.6 0,048Tn tht qua cc mng trn (b lng ct, b tip xc) ly bng 0,1m4. Cao trnh theo bn:Cao trnh theo bn c ct theo s :- T b lng ly tm I n b mtan.- T b lng II ti b nn bn, sau ti b mtan v sn phi bn.- T b lng ly tm II hi lu v Aeroten.- T b lng tip xc n sn phi bn.V. KT LUN:Trn y l s liutnh ton cc cng trnh lin quan n trm x l nc thi. Da vo nhng s liu ny c th thit k s b trm x l nc thi do yu cu ra. Do lng tnh ton kh nhiu nn khng th trnh khi nhng sai nhm, knh mong thy gio TS Trn Quang Quang b qua.SVTH:Cao Vn Cnh- Lp 07MT2 Trang 34