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:environment@biowishtech.com

CSWT23MA11INT

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BiOWiSH™isaregisteredtrademarkofBiOWiSHTechnologiesInc.

www.biowishtech.com

Figure 5 - BiOWiSH™ Dosing Set Up

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