unit processes design criteria for existing sci site ... · influent isolation gate - motorized...

Unit Processes Design Criteria for Existing SCI Site - Option A Phase 1

Design FlowsUnits Design Criteria

Average Day Flow (ADF) m3/d 2,805,204ADF x 1.5 peaking factor m3/d 4,207,806ADF x 2.0 peaking factor m3/d 5,610,408

Rapid Mix ChemicalsUnits Design Criteria

Ferric ChlorideAverage Dose mg/l 10Maximum Dose mg/l 40

PolymerAverage Dose mg/l 0.1Maximum Dose mg/l 1.0

Rapid Mix Chambers - Existing SCI PlantUnits Design Criteria

No. of Chambers (Trains) - 4Compartments Per Chambers (Each Train) - 2Size of Each Compartment (W x L x SWD) m x m x m 5 x 5 x 10Volume of Each Compartment m3 250Type of Mixer - Vertical ShaftNo. of Mixers (Total) - 8Drive - 2 speedInfluent Isolation Gate - Motorized Penstock

Rapid Mix Chambers - For Stage 2 Flows

No. of Chambers (Trains) - 2Compartments Per Chambers (Each Train) - 2Size of Each Compartment (W x L x SWD) m x m x m 3.3 x 10 x 10Volume of Each Compartment m3 330Type of Mixer - Vertical ShaftNo. of Mixers (Total) - 4Drive - 2 speedInfluent Isolation Gate - Motorized Penstock

Flocculation Tanks - Existing SCI Plant

No. of Trains - 2Units Per Train - 2 pairs in seriesCapacity Each Train m3/d 295914

591828Size Each Tank (W x L x SWD) m x m x m 7 x 64 x 8.5Volume, Each Tank m3 3808Detention Time, Each Tank min 25.4

min 6.35Type of Flocculator - Air*Aeration System

Air Supply System m3/min/m 0.47 (minimum)Length of each train m 240Total of air required, each train m3/min 115

No. of Blowers unit 6Each Stage duty 2

standby 1Blower Size, Each m3/min 60 (minimum)Discharge Pressure mbar 800 (minimum)Type of Blower - Positive DisplacementInstalled Power, Each kW 132Type of Diffusers - Tube-type rubber membrane

Appendix FAppendix F.xls/SCI Option A Phase 1 1 of 4

Type of Diffuser Head - Swing-type with control valve

Flocculation Tanks - For Stage 2 Flows

No. of Trains - 2Units Per Train - 1Capacity Each Train m3/d 298917 @ ADF

597834 @ PDFSize Each Tank (W x L x SWD) m x m x m 7 x 58.2 x 10Volume, Each Tank m3 4074Detention Time, Each Tank min 19.6 @ ADF

9.8 @ PDFType of Flocculator - Air*

* Proposed flocculators would connect into the existing flocculation air supply system

Sedimentation Tank System - For Existing SCI and Stage 2 Flows

Process with chemicalType of Tank Double trayNo. of Tanks

New - 14Total - 52

Capacity Each Tank @ ADF m3/d 54361Tank Dimensions

Effective LengthUpper Tank m 56Lower Tank m 60.5Width (upper and lower) m 7Liquid Depth (upper and lower) m 3.5 +/-Effective Surface Area, Each Tank m2 815.5Total Surface Area (New Tanks) m2 11417Total Surface Area (All Tanks) m2 42406

Volume Each Tank m3 2855Tank Detention Time @ ADF hrs 1.27Surface Loading Rates

All Basins (design value = 66.7) @ ADF m3/m2/d 66.24 tanks out of service @ ADF m3/m2/d 71.7All Basins @ 1.5X m3/m2/d 99.2All Basins @ 2.0X m3/m2/d 132.3

Weir Length/Tank m 12.5Weir Loading Rate m3/m/d 4316Sludge Generated (Total) t/d 717

Sludge Collection MechanismType of Mechanism Chain and flightChain Material Non-metallicNo. of Flight Scraper Mechanisms 104

Sludge Solids Concentration % 2-4 (+/-)Scum Collection Mechanism

Type of Mechanism Tilting WeirNo. of Scum Mechanisms 104


New Influent Pumping Station

Peak Phase 2 Flow m3/s 25.2Type -Number (Duty, Standby) - 6 , 2Power hpDrive - VFD

Disinfection Facilities

Chlorine Contact TankContact Time

at maximum flow min 13 (exclude 7min in effluent tunnel)at ADF min 20 (exclude 10min in effluent tunnel)

No. of Trains - 4Volume of each Train m3 10,100

Chlorine On-site GenerationSeawater pumping station

Type - Dry WellNumber (Duty, Standby) - 2 , 1Flow Rate l/s 243

Electrochlorination PlantNumber (Duty, Standby) - 4 , 1Production Rate kg Cl/hr 875

Sodium Bisulphite Storage Tank

Number of Storage Tanks (Duty, Standby) 1 , 1Height m 10Diameter m 5

Total Storage Time Provided day 7

Sludge Processing Facilities

Sludge Quantities

Primary SludgeQuantity kg DS/d 716,753Volume m3/d 23,892Percent Solids % 3

Liquid Sludge Storage

Existing Storage Tanks - 5Volume of Tanks (each) m3 2,400Total Tank Volume m3 12,000

Additional Storage Tanks - 1Volume of Tanks (each) m3 2,400Total Tank Volume m3 2,400

Total Storage Provided m3 14,400Total Storage Time Provided hrs 14.47

Sludge Dewatering

Total Volume m3/d 23,892Sludge Flow m3/hr 996Existing Centrifuges - 10Existing Centrifuge Capacity m3/hr 80

Total Required CentrifugesOperating - 12


Standby - 4

Additional Centrifuges - 6

Additional Sludge Feed Pumps - 8

Sludge Cake Storage Silos

Quantity of Dry Sludge Solids kg DS/d 607,630Sludge Cake Solids Percent % 30Quantity of Dewatered Wet Sludge Solids kg WS/d 2,025,433Sludge Density 1.075Volume of Dewatered Sludge per Day m3/d 1,884Desired Cake Storage Time hrs 13Volume of Cake Storage Required m3 1,021Number of Existing Silos (Duty, Standy) 4 , 1Volume of Existing Silos

Each m3 200Total m3 800

Number of Additional Silos - 2 , 0Volume of Additional Silos


Actual Cake Storage Time hrs 15.29

Sludge Cake Transfer Containers

Tonnes of Wet Solids to be Hauled t WS/d 2,025Capacity of Each Container tonnes 14.5Number of Containers per day 140Total Number of Containers Required (5 Sets) - 698Existing Containers - 400Additional Containers Required - 298

Filtered Effluent Tunnel

Number of Conduits - 1Diameter m 7Velocity

ADF m/s 0.8ADF x 1.5 peaking factor m/s 1.3ADF x 2.0 peaking factor m/s 1.7

Final Effluent Conduit

Number of Conduits - 2Dimension (each) mxm 4.3 x 4.3Velocity



Unit Processes Design Criteria for PRT Site - Option A Phase 2

Conduits from SCI to PRT Site

Number of Conduits - 2Dimensions m x m 4 x 4Velocity


Conduits Feeding BOD Filters

Number of Conduits - 4Dimensions m x m 2.5 x 2.5Velocity

ADF + Backwash m/s 1.51.5X Flow + Backwash m/s 2.12.0X Flow + Backwash m/s 2.8

BOD Filters

Design Parameters @ ADFOrganic Loading Rate kg/m3-media-d 5.4Hydraulic Loading Rate m3/m2/hr 10.9

No. of TanksRequired - 100Total Provided - 120Allowance for Redundancy - 20

Filter Effective DimensionsLength m 12Width m 9Media Depth m 4Effective Surface Area

Each Filter m2 108Total m2 12960

Media Volume (each filter)Each Filter m3 432Total m3 51840

Media Type - expanded clayMedia Size mm 3.5 - 6Weir Length m 4.1

Tank Wall Thickness m 1

Hydraulic Loading RatesADF + Backwash (All Tanks) m3/m2/hr 10.5ADF + Backwash (4 out of service) m3/m2/hr 10.81.5X Flow + Backwash (All Tanks) m3/m2/hr 15.02X Flow + Backwash (All Tanks) m3/m2/hr 19.5

BOD Filters Effluent Conduits

Type of Channel - TaperedNumber of Channels - 8Width m 2Depth (varies) m 0.17 - 2.5Velocity (at largest channel area)



Nitrification Filters Influent Conduits



Nitrification Filters









Nitrification Filters Effluent Conduits




Backwash Channel/Wet Well

Number of Channels - 1Dimensions (w x h) m x m 6.4 x 6.4Velocity


Denitrification Feed Channel

Number of Channels - 1Dimensions (w x h) m x m 6.1 x 6.1Velocity (BW water has been removed)

ADF m/s 0.871.5X Flow m/s 1.32.0X Flow m/s 1.74

Denitrification Filters






Media Type - expanded clayMedia Size mm 4 - 8Weir Length m 4.1



Conduit to Effluent Pump Station

Number of Conduits - 2Dimensions (w x h) m x m 3.9 x 3.9Velocity


Effluent Pump Station


Type of Pump - vertical mixed flowNumber of Pumps - 14Capacity of Each Pump m3/s 4.7Total Dynamic Head m 30Number of Pump Station Effluent Channels - 2Effluent Channel (w x h) m x m 4.5 x 4.5Velocity


Filter Backwash System

BOD FiltersBackwash Air Flow Rate Nm/hr 95Backwash Water Flow Rate m3/m2/hr 35Duration of Backwash Water Flow min 25

Nitrification FiltersBackwash Air Flow Rate Nm/hr 75Backwash Water Flow Rate m3/m2/hr 20Duration of Backwash Water Flow min 25

Denitrification FiltersBackwash Air Flow Rate Nm/hr 95Backwash Water Flow Rate m3/m2/hr 35Duration of Backwash Water Flow min 25

Backwash Flow (Based on flows and durations abovem3/d 365,175Backwash Flow (16% of ADF) m3/d 448,833* Used 16% of ADF to be conservative

Backwash PumpsType -Number (Duty, Standby) - 6 , 4Power hp 500Drive - VFDMax Flow (each pump) m3/s 1

Waste Backwash System Rapid Mix Chambers

No. of Chambers (Trains) - 4Compartments Per Chambers (Each Train) - 1Size of Each Compartment (W x H x SWD) m x m x m 6.1 x 6.1 x 10Volume of Each Compartment m3 372Type of Mixer Vertical Shaft

Waste Backwash System Flocculation Tanks

No. of Trains - 4Units Per Train - 1Size Each Tank (W x L x SWD) m x m x m 6.1 x 26.3 x 8.5Volume, Each Tank m3 1364Volume, Total m3 5455Detention Time, Each Train min 17.5Type of Flocculator - Air

Backwash Chemically Enhanced Sedimentation (BCES) Tanks

Process with chemical


Type of Tank Double trayNo. of Tanks - 10Tank Dimensions

Effective LengthUpper Tank m 51.62Lower Tank m 56.15Width (upper and lower) m 7Liquid Depth (upper and lower) m 3.5 +/-Effective Surface Area, Each Tank m2 754.6Total Surface Area (All Tanks) m2 7546

Volume Each Tank m3 2641Tank Detention Time at Backwash Flow of 16% hrs 1.41Surface Loading Rate

All Basins (design value = 55.7) m3/m2/d 59.52 tanks out of service m3/m2/d 74.3



Sludge Solids Concentration % 2 (+/-)Scum Collection Mechanism


Waste Backwash Pumps

Type -Number (Duty, Standby) - 6 , 4Power hp 500Drive - VFDMax Flow (each pump) m3/s 1

BOD and Nitrification Air Supply System

Type -Number (Duty, Standby) - 5 , 2Total Power hp 3200Drive - VFDTotal Maximum Flow scfm 63000

BAF HVAC SystemBlowers Required (1 per 24 BAF units) - 14Power hp 50Air Changes per hour - 6Volume of Ventilated space m3 55,650


Methanol Storage

Methanol Required m3/d 568Methanol Purity (as delivered) % 96Source of Motive Water - Nitrified EffluentDilution for Transfer - 20:1Number of Tanks - 5Tank Size

Diameter m 3.5Length m 13

Volume m3 125Storage Provided d 3

Fine Screen

Type - BandNumber - 18Height m 8.45Headloss (clean water) mm 97


Sludge Quantities


BAF SludgeQuantity kg DS/d 278,031Volume m3/d 14,048Percent Solids % 1.98

Total SludgeQuantity kg DS/d 994,784Volume m3/d 37,940



Storage Tanks for Phase 1 - 1Volume of Tanks (each) m3 2,400Total Tank Volume m3 2,400



Sludge Dewatering

Total Volume m3/d 37,940Sludge Flow m3/hr 1,581Existing Centrifuges - 10Centrifuge for Phase 1 - 6


Existing Centrifuge Capacity m3/hr 80

Total Required CentrifugesOperating - 20Standby - 2




Quantity of Dry Sludge Solids kg DS/d 895,306Sludge Cake Solids Percent % 30Quantity of Dewatered Wet Sludge Solids kg WS/d 2,984,353Sludge Density 1.075Volume of Dewatered Sludge per Day m3/d 2,776Desired Cake Storage Time hrs 13Volume of Cake Storage Required m3 1,504Number of Existing Silos (Duty, Standy) 5 , 0Number of Silos for Phase 1 (Duty, Standy) 2 , 0Volume of Existing & Phase 1 Silos






Tonnes of Wet Solids to be Hauled t WS/d 2,984Capacity of Each Container tonnes 14.5Number of Containers per day 206Total Number of Containers Required (5 Sets) - 1029Existing Containers - 400Containers for Phase I - 298Additional Containers Required - 331


Unit Processes Design Criteria for Existing SCI Site - Option B Phase 1


Average Day Flow (ADF) m3/d 2,207,369ADF x 1.5 peaking factor m3/d 3,311,054ADF x 2.0 peaking factor m3/d 4,414,738




Rapid Mix Chambers - Existing SCI PlantUnits Design Criteria

No. of Chambers (Trains) - 4Compartments Per Chambers (Each Train) - 2Size of Each Compartment (W x H x SWD) m x m x m 5 x 5 x 10Volume of Each Compartment m3 250Type of Mixer - Vertical ShaftNo. of Mixers (Total) - 8Drive - 2 speedInfluent Isolation Gate - Motorized Penstock

Flocculation Tanks - Existing SCI Plant

No. of Trains - 2Units Per Train - 2 pairs in seriesCapacity Each Train m3/d 295914

591828Size Each Tank (W x L x SWD) m x m x m 7 x 64 x 8.5Volume, Each Tank m3 3808Detention Time, Each Tank min 25.4

min 6.35Type of Flocculator - Air*Aeration System

Air Supply System m3/min/m 0.47 (minimum)Length of each train m 240Total of air required, each train m3/min 115

No. of Blowers unit 6Each Stage duty 2

standby 1Blower Size, Each m3/min 60 (minimum)Discharge Pressure mbar 800 (minimum)Type of Blower - Positive DisplacementInstalled Power, Each kW 132Type of Diffusers - Tube-type rubber membraneType of Diffuser Head - Swing-type with control valve

Appendix FAppendix F.xls/SCI Option B Phase 1 1 of 4

Sedimentation Tank System - For Existing SCI and Future Flows


New - 6Total - 44

Capacity Each Tank @ ADF m3/d 54361Tank Dimensions

Effective LengthUpper Tank m 56Lower Tank m 60.5Width (upper and lower) m 7Liquid Depth (upper and lower) m 3.5 +/-Effective Surface Area, Each Tank m2 815.5Total Surface Area (New Tanks) m2 4893Total Surface Area (All Tanks) m2 35882

Volume Each Tank m3 2855Tank Detention Time @ ADF hrs 1.37Surface Loading Rates






New Influent Pumping Station

Peak Phase 2 Flow m3/s 11.35Type -Number (Duty, Standby) - 6 , 2Power hpDrive - VFD










Number of Storage Tanks (Duty, Standby) 1 , 1Height m 8Diameter m 4.6



Sludge Quantities




Additional Storage Tanks - 0Volume of Tanks (each) m3 2,400Total Tank Volume m3 0


Sludge Dewatering

Total Volume m3/d 18,715Sludge Flow m3/hr 780Existing Centrifuges - 10Existing Centrifuge Capacity m3/hr 80





Quantity of Dry Sludge Solids kg DS/d 478,134Sludge Cake Solids Percent % 30Quantity of Dewatered Wet Sludge Solids kg WS/d 1,593,780Sludge Density 1.075Volume of Dewatered Sludge per Day m3/d 1,483Desired Cake Storage Time hrs 13Volume of Cake Storage Required m3 803Number of Existing Silos (Duty, Standy) 4 , 1Volume of Existing Silos

Each m3 200


Total m3 800Number of Additional Silos - 1 , 0Volume of Additional Silos




Tonnes of Wet Solids to be Hauled t WS/d 1,594Capacity of Each Container tonnes 14.5Number of Containers per day 110Total Number of Containers Required (5 Sets) - 550Existing Containers - 400Additional Containers Required - 150

Filtered Effluent Tunnel

Number of Conduits - 1Diameter m 6Velocity


Final Effluent Conduit

Number of Conduits - 2Dimension (each) mxm 4 x 4Velocity



Unit Processes Design Criteria for PRT Site - Option B Phase 2

Conduits from SCI to PRT Site



Conduits Feeding BOD Filters



BOD Filters













Backwash Channel/Wet Well

Number of Channels - 1Dimensions (w x h) m x m 6.4 x 6.4Velocity



Number of Channels - 1Dimensions (w x h) m x m 6.1 x 6.1Velocity (BW water has been removed)











Conduit to Effluent Pump Station

Number of Conduits - 2Dimensions (w x h) m x m 3.9 x 3.9Appendix FAppendix F.xls/SCI Option B Phase 2 3 of 7

VelocityADF m/s 0.841.5X Flow m/s 1.262.0X Flow m/s 1.68

Effluent Pump Station

Type of Pump - vertical mixed flowNumber of Pumps - 14Capacity of Each Pump m3/s 4.7Total Dynamic Head m 30Number of Pump Station Effluent Channels - 2Effluent Channel (w x h) m x m 4.5 x 4.5Velocity






Backwash Flow (Based on flows and durations above) m3/d 291,150Backwash Flow (16% of ADF) m3/d 353,179* Used 16% of ADF to be conservative


Backwash PumpsType -Number (Duty, Standby) - 6 , 4Power hp 500Drive - VFDMax Flow (each pump) m3/s 1

Waste Backwash System Rapid Mix Chambers

No. of Chambers (Trains) - 4Compartments Per Chambers (Each Train) - 1Size of Each Compartment (W x H x SWD) m x m x m 6.1 x 6.1 x 10Volume of Each Compartment m3 372Type of Mixer Vertical Shaft

Waste Backwash System Flocculation Tanks

No. of Trains - 4Units Per Train - 1Size Each Tank (W x L x SWD) m x m x m 6.1 x 26.3 x 8.5Volume, Each Tank m3 1364Volume, Total m3 5456Detention Time, Each Train min 22.2Type of Flocculator - Air

Backwash Chemically Enhanced Sedimentation (BCES) Tanks

Process with chemicalType of Tank Double trayNo. of Tanks - 8Tank Dimensions

Effective LengthUpper Tank m 51.62Lower Tank m 56.15Width (upper and lower) m 7Liquid Depth (upper and lower) m 3.5 +/-Effective Surface Area, Each Tank m2 754.6Total Surface Area (All Tanks) m2 6036.8

Volume Each Tank m3 2641Tank Detention Time at Backwash Flow of 16% hrs 1.79Surface Loading Rate

All Basins (design value = 55.7) m3/m2/d 58.52 tanks out of service m3/m2/d 78.0



Sludge Solids Concentration % 2 (+/-)Scum Collection Mechanism

Type of Mechanism Tilting WeirNo. of Scum Mechanisms 104No. of Scum Mechanisms 104


Waste Backwash Pumps

Type -Number (Duty, Standby) - 6 , 4Power hp 500Drive - VFDMax Flow (each pump) m3/s 1

BOD and Nitrification Air Supply System

Type -Number (Duty, Standby) - 5 , 2Total Power hp 3200Drive - VFDTotal Maximum Flow scfm 63000

BAF HVAC SystemBlowers Required (1 per 24 BAF units) - 14Power hp 50Air Changes per hour - 6Volume of Ventilated space m3 55,650

Methanol Storage




Fine Screen



Sludge Quantities


BAF SludgeQuantity kg DS/d 197,546Volume m3/d 9,982Percent Solids % 1.98

Total SludgeQuantity kg DS/d 758,986Volume m3/d 28,697




Storage Tanks for Phase 1 - 0Volume of Tanks (each) m3 2,400Total Tank Volume m3 0



Sludge Dewatering

Total Volume m3/d 28,697Sludge Flow m3/hr 1,196Existing Centrifuges - 10Centrifuge for Phase 1 - 3Existing Centrifuge Capacity m3/hr 80





Quantity of Dry Sludge Solids kg DS/d 683,087Sludge Cake Solids Percent % 30Quantity of Dewatered Wet Sludge Solids kg WS/d 2,276,957Sludge Density 1.075Volume of Dewatered Sludge per Day m3/d 2,118Desired Cake Storage Time hrs 13Volume of Cake Storage Required m3 1,147Number of Existing Silos (Duty, Standy) 4 , 1Number of Silos for Phase 1 (Duty, Standy) 1 , 0Volume of Existing & Phase 1 Silos






Tonnes of Wet Solids to be Hauled t WS/d 2,277Capacity of Each Container tonnes 14.5Number of Containers per day 157Total Number of Containers Required (5 Sets) - 785Existing Containers - 400Containers for Phase I - 150Additional Containers Required - 235


Unit Processes Design Criteria for Lamma Island - Option B Phase I


Average Day Flow (ADF) m3/d 597,834ADF x 1.5 peaking factor m3/d 896,751ADF x 2.0 peaking factor m3/d 1,195,668




Rapid Mix ChambersUnits Design Criteria

No. of Chambers (Trains) - 2Compartments Per Chambers (Each Train) - 2Size of Each Compartment (W x H x SWD) m x m x m 7 x 5.7 x 10Volume of Each Compartment m3 399Type of Mixer - Vertical ShaftNo. of Mixers (Total) - 4Drive - 2 speedInfluent Isolation Gate - Motorized Penstock

Flocculation Tanks

No. of Trains - 2Units Per Train - 2Total No. of Tanks - 4Size Each Tank (W x L x SWD) m x m x m 11.8 x 33.1 x 9Volume, Each Tank m3 3515.2Type of Flocculator - AirAeration System

Air Supply System m3/min/m 0.47 (minimum)Length of each train m 33.1Total air required, each train m3/min 15.6

Type of Blower - Positive DisplacementType of Diffusers - Tube-type rubber membraneType of Diffuser Head - Swing-type with control valve

Sedimentation Tank System


Total - 20Capacity Each Tank @ ADF m3/d 28789Tank Dimensions

Effective Length (Upper and Lower) m 42

Appendix FAppendix F.xls/Lamma Option B Phase 1 1 of 3

Width (Upper and Lower) m 7Depth (Upper and Lower) m 3.7Effective Surface Area, Each Tank m2 588Total Surface Area (All Tanks) m2 11760

Volume Each Tank m3 2175.6Tank Detention Time @ ADF hrs 1.75Surface Loading Rates


Sludge Generated (Total) t/d 199




Inlet Pumping Station

Peak Phase 2 Flows m3/s 13.84Type -Number (Duty, Standby) - 4, 2Power hpDrive - VFD









Number of Storage Tanks (Duty, Standby) 1 , 1Height m 6Diameter m 4.0




Sludge Quantities



Storage Tanks - 3Volume of Tanks m3 2,400Total Tank Volume m3 7,200


Sludge Dewatering

Total Volume m3/d 7,078Sludge Flow m3/hr 295Centrifuge Capacity m3/hr 80


Centrifuges - 4

Sludge Feed Pumps - 6


Quantity of Dry Sludge Solids kg DS/d 129,496Sludge Cake Solids Percent % 30Quantity of Dewatered Wet Sludge Solids kg WS/d 431,653Sludge Density 1.075Volume of Dewatered Sludge per Day m3/d 402Desired Cake Storage Time hrs 13Volume of Cake Storage Required m3 217Number of Silos - 2 , 1Volume of Silos




Tonnes of Wet Solids to be Hauled t WS/d 432Capacity of Each Container tonnes 14.5Number of Containers per day 30Total Number of Containers Required (5 Sets) - 149


Unit Processes Design Criteria for Lamma Site - Option B Phase 2

BOD Filters Influent Conduits

Type of Channel - squareNumber of Channels - 2Width m 2Depth m 2Velocity (at largest channel area)


BOD Filters


No. of Tanks Required - 25Total No. of Tanks Provided - 32Allowance for Redundancy - 7




Media Type - expanded clayMedia Size mm 3.5 - 6






Type of Channel - square


Number of Channels - 2Width m 2Depth m 2Velocity (at largest channel area)















Number of Channels - 2DimensionsWidth m 2


Depth m 2Velocity (BW water has been removed)










Hydraulic Loading RatesADF (All Tanks) m3/m2/hr 12.8ADF (4 out of service) m3/m2/hr 16.11.5X Flow (All Tanks) m3/m2/hr 19.22X Flow (All Tanks) m3/m2/hr 25.6





Backwash Flow (16% of ADF) m3/d 95,653


* Used 16% of ADF to be conservative

Methanol Storage




Fine Screen



Sludge Quantities



Storage Tanks for Phase 1 - 3Volume of Tanks (each) m3 2,400Total Tank Volume m3 7,200

Additional Storage Tanks - 0Volume of Tanks (each) m3 2,400Total Tank Volume m3 0


Sludge Dewatering

Total Volume m3/d 7,078Sludge Flow m3/hr 295Centrifuge for Phase 1 - 4Existing Centrifuge Capacity m3/hr 80






Quantity of Dry Sludge Solids kg DS/d 191,095Sludge Cake Solids Percent % 30Quantity of Dewatered Wet Sludge Solids kg WS/d 636,983Sludge Density 1.075Volume of Dewatered Sludge per Day m3/d 593Desired Cake Storage Time hrs 13Volume of Cake Storage Required m3 321Number of Silos for Phase 1 (Duty, Standy) 2 , 1Volume of Existing & Phase 1 Silos






Tonnes of Wet Solids to be Hauled t WS/d 637Capacity of Each Container tonnes 14.5Number of Containers per day 44Total Number of Containers Required (5 Sets) - 220Containers for Phase I - 149Additional Containers Required - 71


Unit Processes Design Criteria for Lamma Island - Option Bm


Average Day Flow (ADF) m3/d 597,834ADF x 1.5 peaking factor m3/d 896,751ADF x 2.0 peaking factor m3/d 1,195,668




Rapid Mix ChambersUnits Design Criteria

No. of Chambers (Trains) - 2Compartments Per Chambers (Each Train) - 2Size of Each Compartment (W x H x SWD) m x m x m 7 x 5.7 x 10Volume of Each Compartment m3 399Type of Mixer - Vertical ShaftNo. of Mixers (Total) - 4Drive - 2 speedInfluent Isolation Gate - Motorized Penstock

Flocculation Tanks

No. of Trains - 2Units Per Train - 2Total No. of Tanks - 4Size Each Tank (W x L x SWD) m x m x m 11.8 x 33.1 x 9Volume, Each Tank m3 3515.2Type of Flocculator - AirAeration System

Air Supply System m3/min/m 0.47 (minimum)Length of each train m 33.1Total air required, each train m3/min 15.6

Type of Blower - Positive DisplacementType of Diffusers - Tube-type rubber membraneType of Diffuser Head - Swing-type with control valve

Sedimentation Tank System


Total - 20Capacity Each Tank @ ADF m3/d 28789Tank Dimensions

Effective Length (Upper and Lower) m 42Width (Upper and Lower) m 7Depth (Upper and Lower) m 3.7Effective Surface Area, Each Tank m2 588Total Surface Area (All Tanks) m2 11760

Volume Each Tank m3 2175.6Tank Detention Time @ ADF hrs 1.75

Appendix FAppendix F.xls/Lamma Option Bm 1 of 6

Surface Loading RatesAll Basins (design value = 66.7) @ ADF m3/m2/d 59.04 tanks out of service @ ADF m3/m2/d 73.7All Basins @ 1.5X m3/m2/d 84.4All Basins @ 2.0X m3/m2/d 109.8

Sludge Generated (Total) t/d 199




BOD Filters Influent Conduits



BOD Filters






Media Type - expanded clayMedia Size mm 3.5 - 6



Type of Channel - squareNumber of Channels - 2Width m 2


Depth m 2Velocity (at largest channel area)



















Number of Channels - 2DimensionsWidth m 2Depth m 2Velocity (BW water has been removed)










Hydraulic Loading RatesADF (All Tanks) m3/m2/hr 12.8ADF (4 out of service) m3/m2/hr 16.11.5X Flow (All Tanks) m3/m2/hr 19.22X Flow (All Tanks) m3/m2/hr 25.6

UV Disinfection System

Minumum Transmissivity % 50Number of Lamps - 2,340Number of Channels - 12Channel Dimensions (l x w) m x m 17 x 2Maximum Electrical Load* kW/kVA 843/887

*Based on 60% Transmissivity






Backwash Flow (16% of ADF) m3/d 95,653* Used 16% of ADF to be conservative


Sludge Quantities



Desired Sludge Storage Time hrs 13

Number of Storage Tanks (Duty, Standy) 1 ,1Height m 10Diameter m 5


Sludge Dewatering

Sludge Flow m3/hr 295

Total Required Centrifuges - 5Operating - 4Standby - 1

Sludge Feed Pump - 6


Quantity of Dry Sludge Solids kg DS/d 191,095Sludge Cake Solids Percent % 30Quantity of Dewatered Wet Sludge Solids kg WS/d 636,983Sludge Density 1.075Volume of Dewatered Sludge per Day m3/d 593Desired Cake Storage Time hrs 24Volume of Cake Storage Required m3 594Number of Silos - 3Volume of Silos


Actual Cake Storage Time hrs 24


Tonnes of Wet Solids to be Hauled t WS/d 637Capacity of Each Container tonnes 14.5Number of Containers per day 44Total Number of Containers Required (5 Sets) - 220

Methanol Storage





Fine Screen



unit processes design criteria for existing sci site ... · influent isolation gate - motorized...

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