BiOWiSH™ Aqua FOG Benefits
• Reducessludgeproductionandhandling
• Increasesplantcapacitybyreducingcontacttime(capitalavoidance)
• Eliminatesodorousemissions
• Deliverssubstantialenergysavingsduetoreducedaeration
• Minimizesneedforchemicaladditives
• Stabilizesandimprovesplanttreatmentperformance
• Lowershydrogensulphide,ammoniaandnitratelevels
• Pre-treatsinfluentincollectionsystems
• 100%naturalandnon-toxic
Available Sizes
• 100g
• 1kg
Wastewater Treatment
Case Study
Mission Beach Wastewater Treatment Plant, Washington, USA
Summary
TheMissionBeachWastewaterTreatmentPlant(WWTP)initiatedafieldtrialofBiOWiSH™ Aqua FOGtoevaluatethereductionofsludgegeneratedfromtheirfacilityinWashington.PriortotheapplicationofBiOWiSH™ Aqua FOG,theMissionBeachWWTPwasspendinginexcessof$100,000peryeartoremovebiosolidsfromthefacilityandtohaulittoalandfill.Inaddition,effluentturbidityreducedtheeffectivenessoftheultraviolet(UV)disinfectionsystem.Afterthetrial,BiOWiSH™ Aqua FOGreducedsludgegenerationfromthesystembyover91%,basedontankertrucksludgehaulingvolumes.Asaresult,sludgehaulingbecamelessfrequent,fromeverytwotothreedaystoonceamonth.Plantoperatorsalsoobservedareductionineffluentturbidity,whichresultsinimproveddisinfectionoftheeffluentdischarge.
Background
TheMissionBeachWWTPislocatedinSnohomishCounty,WashingtonwestoftheCityofMarysvilleinaresidentialdevelopment.Ownedandoperatedbytheregionalcouncil,theWWTPsystemincludesover32kmofreticulationandcollectionsystempiping,11pumpstationsand45kmofrisingmainsandislocatedinsandy,highgroundwaterconditions.
Therearenoindustrialcontributorstothewastewatercollectionandtreatmentsystem.SeveralcommercialfacilitiesdischargesewagetothisWWTP;otherwise,allotherusersareresidential.Thesystemisoperatingwell,andthefinaltreatedeffluentiswithinpermittedeffluentdischargeconditions.Sludgeiswastedtoanaerateddigestertankandcollectedforhaulingonan“asneeded”basistoanauthorizedsludgetreatmentfacility.
System details:
• Serviceareapopulation:approximately3,200capita
• Collectionsystemtype:100%separatedsanitarysewer
• Treatmenttrain:Secondarywastewatertreatment(activatedsludge)followedbyultraviolet(UV)disinfection
• DesignFlow:616,000gallon/day,Actualflow:300,000gallon/day
• EffluentdischargedtothePossessionSound(North)inPugetSound,approx.1600ft.marineoutfallpipe;12-inchdiameterpipe;at51feetbelowMeanLowerLowWater(MLLW).
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Objectives
TheWWTPfacilitywasexperiencingsignificantcostsduetothequantityofsludgegenerationattheplant.Additionally,turbidityintheplanteffluentwasaffectingtheeffectivenessoftheUVdisinfectionprocess.Twootherminorissuesweretreatmentcapacityandprocessstability.Giventheseissuesthefieldtrialwasinitiatedwiththefollowingobjectivesinmind:
• Cutcostsassociatedwithsludgepumpoutrequirements
• Reduceeffluentturbidity
• Reducesludgevolumeforenhancedtreatmentcapacity
• Improveprocessstabilitydespiteloadandflowvariations
Solution
BiOWiSH™ Aqua FOGwasusedtoenhancethebiologicalconversionefficiencyoftheactivatedsludgetreatmentprocess.Asaresultoftheimprovedconversionefficiencythecellulargrowthratewasreducedandthustherewascorrespondingreductionofbiosolidsgeneratedfromtheaerationbasin.Themixed-liquorsuspendedsolids(MLSS)weremaintainedatpre-BiOWiSH™concentrations(approximately2,200to4,500mg/L)bymaintainingtheappropriatereturnactivatedsludge(RAS)flowrate.Asaresultofthereducedbiosolidsproduction,thewasteactivatedsludge(WAS)flowratewasreducedapproximately50-60%,basedonoperatorobservations(WASflowwasnotrecorded).TheWASflowwassenttoanaerateddigestertankwhereadditionalreductionofthesolidsoccurred.Duringsludgeremoval,thedigesteraeratorswereturnedoffandsludgedecantedtomaximizesolidsremovalandtominimizethehaulingofexcesswater.
Headworks to the Mission Beach WWTP. The overall condition
of the plant is well-maintained and the existing treatment
system consistently meets permit conditions.
Figure 2 - BiOWiSH™ Dosing system
(blue containers on the left side feeding
into headworks channel)
Figure 1 - Treatment Headworks
Splitter channel and the dosing drums (in blue on the left).
The trickle feed tube is fixed to the metal grate.
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Results
Sludge Reduction
Thefacilityexperiencedslightlyover91%reductionintotalsludgevolumegeneration,asshowninFigure3.Sludgegenerationvolumewascalculatedfromthesludgehaulingrate,witheachsludgehaulingeventrepresentingapproximately3,300gallonsofsludge.Thesludgehaulingtruckwasalwayspumpedfullofsludgeduringeachremoval.Thesludgegenerationratewascalculatedbydividingthepumpedsludgevolumebytheamountoftimerequiredtogeneratethesludge.
Itappearsthattherequiredsludgeremovalwillbereducedfrom140timesperyeartoapproximately10to12timesperyear.Asaresult,significantreductionsinoperatingcostswerenoted.PriortotheapplicationofBiOWiSH™,theMissionBeachWWTPwasspendinginexcessof$100,000peryeartoremovebiosolidsfromthefacilityandtohaulittoalandfill.Annualproductcostsareestimatedtobeapproximately$44,000peryear,andthecapitalcostsofthedrumsandtubingwerearound$6,000.Overallreductioninsludgehaulingcostsareexpectedtobeapproximately$85,000(duetosomeminorfixedhaulingcosts),withanapproximatepaybackperiodof6weeks.
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Reduction in sludge generationCalculated from sludge hauling truck loads
Sludge production
BiOWiSH-Aqua FOG
Sludge reduction was due to three factors: decreased biosolids growth rate, enhanced sludge
digestion in the aerobic digesters, and improved settling during the sludge decant stage.
Figure 3 – Over 91% reduction in sludge hauling
“The great reduction in sludge generated by the plant and the associated costs of removal, which were the single largest operating cost item in our annual budget,
will allow us to re-allocate these projected savings to other uses”. Cliff Jones, Plant Manager
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Treatment Stability and Effluent Conditions
TheWWTPwasalreadyrunninganefficienttreatmentprocessandsotherewasonlyminorimprovementineffluentBODandTSS.Howevertheplantoperatorsnotedsignificantreductionineffluentturbidity.EffluentpHwasalsonotedtobemoreconsistentwhichhasaddedstabilitytotheoveralloperation.
Conclusion
BiOWiSH™ Aqua FOGwasfoundtobeveryeffectiveinmeetingalltheobjectives.ItactedasapowerfulbiocatalysttoimprovethebiologicaltransformationoftheinfluentBOD,andthusreducethesludgevolumegeneration.TurbidityreductionwasobservedintheeffluentafterapplicationoftheBiOWiSH™product.Significantreductionsinsludgegenerationwerenotedandthetruckloadscarryingsludgeoffsitewerereduced.
BiOWiSH™ Aqua FOGhasbeensuccessfulinsimilarapplicationsandhasdemonstratedasignificanttrackhistoryofprocessenhancementattreatmentplantsaroundtheworld.Ithasprovenrecordofbenefitinreductionsinsolidsandsludgebulkingissues.Itsignificantlyimprovestheefficiencyofaerobictreatmentsystems,dissolvedairflotationunits,oilwaterseparatorsandgreasetraps.
Implementation Program
GreenBioSolutions,anauthorizedBiOWiSH™distributor,ledthetechnologyroll-outattheMissionBeachWWTP.BiOWiSH™ Aqua FOGwasdosedtotheaerationchannel.DosingwasdecidedbasedontheflowrateandBODload.Forproductactivation,two55gallondrums(asshowninFigure5)wereused.Theactivationperiodwas24hoursandconstanttemperaturewasmaintainedbetween65-70oF.Submersibleheaterswereusedtomaintaintheconstanttemperatureduringthewintermonths.Theinitialdosingplanwastorequiredosing4kgperdayofBiOWiSH™ Aqua FOGfor5days,afterwhichthedosagewastobereducedto1kgperday,respectivelyequivalentto3.52mg/Land0.88mg/L,basedonflowrate.Theambienttemperatureatinitiationwasabout50degreeF.However,byday3thetemperaturehaddroppedtoabout20degreesFandbasedonobservingtheactivatedsludgetheactivationwasnotgoingasplanned.Ittook2daystoobtaindrumheaters.Inthose2daystheoperatorsdosed1kgperdayintothesystem,thenwentbacktotheshockdosephaseof4kgperdayforanother3days.
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Slight improvement in process stabilizationInfluent/effluent loads, plus BiOWiSH™-Aqua feed rate
Influent TSSEffluent TSSInfluent BODEffluent BODBiOWiSH-Aqua FOG
Figure 4 – Impact on load variation
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Oncetheshockphasewascompleted,theoperatorswenttodailymaintenancedosingof1kgperday.Dosingwascarriedoutusingperistalticpumpwithconstantflow.
Duringtheproductinitiationphase,itwasrecommendedthatthedissolvedoxygen(DO)concentrationintheaerobictreatmentprocessbemonitoredandaugmentingwithaportableaeratortomaintainDOabove1.0ppm.
Contacts
BiOWiSH Technologies
Email:[email protected]
CSWT23MA11INT
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BiOWiSH™isaregisteredtrademarkofBiOWiSHTechnologiesInc.
www.biowishtech.com
Figure 5 - BiOWiSH™ Dosing Set Up
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