Waste Product to Resource Waste Product to Resource – – Biosolids Biosolids Handling at City of Handling at City of Wisconsin Rapids Wisconsin Rapids Wisconsin Wastewater Operators Wisconsin Wastewater Operators ’ ’ Association 46 Association 46 th th Annual Conference Annual Conference October 11, 2012 October 11, 2012 Presented by Phil Presented by Phil Korth Korth
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Waste Product to Resource – Biosolids Biosolids Handling ... · PDF fileWaste Product to Resource – – Biosolids Biosolids Handling at City ... Sludge Handling Anaerobic Sludge
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Waste Product to Resource Waste Product to Resource –– BiosolidsBiosolids Handling at City of Handling at City of
Limited Activated Sludge CapacityLimited Activated Sludge Capacity Sludge Storage Tank Limited to 132 Days Sludge Storage Tank Limited to 132 Days
StorageStorage
What Happened?What Happened?
Ocean Spray Added Larger Juice LineOcean Spray Added Larger Juice Line High Strength Cranberry Waste Discharged High Strength Cranberry Waste Discharged
to Sewerto Sewer No Communication from Ocean SprayNo Communication from Ocean Spray
Industrial Agreement ReachedIndustrial Agreement Reached Second Cranberry Company Requested Second Cranberry Company Requested
Annexation for Wastewater ServiceAnnexation for Wastewater Service
Design ConditionsDesign Conditions
5.28 MGD5.28 MGD BOD Load BOD Load –– 18,386 lbs/day18,386 lbs/day TSS Load TSS Load –– 10,994 lbs/day10,994 lbs/day TKN TKN –– 1,181 lbs/day1,181 lbs/day P P –– 177 lbs/day177 lbs/day
City Design PhilosophyCity Design Philosophy
Design for Projected ConditionsDesign for Projected Conditions Allow for Expansion on Site and in Allow for Expansion on Site and in
StructuresStructures Include Sustainable Features Where Include Sustainable Features Where
PracticalPracticalWWTP to be a Resource to CityWWTP to be a Resource to CityAttract Industry/JobsAttract Industry/JobsCapture Value in WasteCapture Value in Waste
Expand Mesophilic Anaerobic DigestionExpand Mesophilic Anaerobic Digestion Convert Anaerobic Digestion Process to Convert Anaerobic Digestion Process to
Temperature Phased Anaerobic Digestion Temperature Phased Anaerobic Digestion (TPAD)(TPAD)
Class A vs. Class BClass A vs. Class B
TPADTPAD
ProsProsReduce Fecal Coliforms to Class A LevelReduce Fecal Coliforms to Class A LevelHigher VSS DestructionHigher VSS Destruction
More BiogasMore Biogas
Less Sludge for DisposalLess Sludge for Disposal
ConsConsHigher Initial CostHigher Initial Cost
TPADTPAD
Design for Class ADesign for Class AConvert Existing Mesophilic Digesters to Convert Existing Mesophilic Digesters to
Thermophilic DigestersThermophilic DigestersUse Time/Temperature Criteria to Meet Class Use Time/Temperature Criteria to Meet Class
A RequirementsA RequirementsNew Mesophilic DigesterNew Mesophilic Digester
Dewater Sludge/Sludge Drying and StorageDewater Sludge/Sludge Drying and Storage75% 75% -- 90% Solids90% SolidsRemote Site Remote Site –– Drying PadDrying PadLowest Cost DisposalLowest Cost DisposalClass A Class A –– Use as Soil Conditioner/LandscapingUse as Soil Conditioner/Landscaping
Sludge HandlingSludge Handling
Dewater and Drying SelectedDewater and Drying Selected Dewater at WWTPDewater at WWTP Store and Drying Pad in Industrial ParkStore and Drying Pad in Industrial Park Class A Sludge to be Used in City Class A Sludge to be Used in City
LandscapingLandscapingReduced CostReduced CostWaste to ResourceWaste to Resource
Digester Heating in Biogas BoilerDigester Heating in Biogas Boiler Biogas Engine Driven Equipment Biogas Engine Driven Equipment
(Blowers/Pumps)(Blowers/Pumps) Electrical GenerationElectrical Generation Combined Heat and PowerCombined Heat and Power
Biogas UtilizationBiogas Utilization
Combined Heat and Power SelectedCombined Heat and Power Selected Engine Generator Selected Based on Engine Generator Selected Based on
EfficiencyEfficiencyMicroturbines Evaluated but Had Lower Microturbines Evaluated but Had Lower
Overall EfficiencyOverall Efficiency
Engine GeneratorEngine Generator
Dual Fuel Operation Possible (Biogas and Dual Fuel Operation Possible (Biogas and Natural Gas)Natural Gas)
Heat Recovery from Engine CoolantHeat Recovery from Engine Coolant Heat Recovery from Engine ExhaustHeat Recovery from Engine Exhaust Overall Energy Efficiency = 83%Overall Energy Efficiency = 83% Biogas Boiler Available as BackBiogas Boiler Available as Back--upup
TPAD Process OperationTPAD Process Operation
Volatile Solids Reduction Volatile Solids Reduction –– 63.7%63.7%10% Improvement from Mesophilic Operation10% Improvement from Mesophilic Operation
TPAD Design FeaturesTPAD Design Features
Two Thermophilic TanksTwo Thermophilic Tanks Feed One Tank Each 24 HoursFeed One Tank Each 24 Hours Automated Feed SystemAutomated Feed System Complex PipingComplex Piping Simple OperationSimple Operation Sludge Feed Small Amounts Each HourSludge Feed Small Amounts Each Hour
TPAD Design FeaturesTPAD Design Features
Common Feed TankCommon Feed TankPrimary SludgePrimary SludgeThickened WASThickened WAS
Piped to Accept High Strength WastePiped to Accept High Strength Waste Caustic Feed for pH ControlCaustic Feed for pH Control
TPAD Design FeaturesTPAD Design Features
Automated Withdrawal SequenceAutomated Withdrawal SequenceMesophilic Sludge to DewateringMesophilic Sludge to DewateringThermophilic A Sludge to MesophilicThermophilic A Sludge to MesophilicFresh Sludge to Thermophilic AFresh Sludge to Thermophilic AThermophilic B Holds at 131Thermophilic B Holds at 131°°
FF..
Mesophilic Digester Has Cooling Heat Mesophilic Digester Has Cooling Heat ExchangerExchanger
Biogas ProductionBiogas Production
Biogas Production = 70,000 cubic feet/dayBiogas Production = 70,000 cubic feet/day48,000 cubic feet/day From Volatile Solids 48,000 cubic feet/day From Volatile Solids
DestructionDestruction22,000 cubic feet/day From High Strength 22,000 cubic feet/day From High Strength
Cranberry Waste Fed Directly to DigestersCranberry Waste Fed Directly to Digesters
Electrical GenerationElectrical Generation
Biogas Engine Provides 29% of Total Biogas Engine Provides 29% of Total Electrical DemandElectrical Demand
Biogas Engine Operates During Peak Biogas Engine Operates During Peak Demand Hours (8 AM to 9 PM)Demand Hours (8 AM to 9 PM)
Hot Water UsageHot Water Usage
Waste Heat from Biogas Engine Used for Waste Heat from Biogas Engine Used for Process Heat in BuildingProcess Heat in BuildingSludge HeatingSludge HeatingBuilding HeatBuilding Heat
Sludge DewateringSludge Dewatering
Rotary Press SelectedRotary Press Selected Enclosed System Enclosed System –– Low OdorLow Odor Low Water UseLow Water Use Can be Stopped For Truck UnloadingCan be Stopped For Truck Unloading
Sludge DewateringSludge Dewatering
Land Available in Industrial Park for Land Available in Industrial Park for Storing and Air Drying SludgeStoring and Air Drying Sludge
Asphalt Pad Built by CityAsphalt Pad Built by City Runoff Collected in Basin with Outlet to Runoff Collected in Basin with Outlet to
Sanitary SewerSanitary Sewer Sludge Stored and Dried in WindrowsSludge Stored and Dried in Windrows
Class A Requirement = <1,000 MPN FecalClass A Requirement = <1,000 MPN Fecal Time/Temperature = 24 hours at 131Time/Temperature = 24 hours at 131°°FF
SummarySummary
Before ProjectBefore ProjectBiosolids are Waste ProductBiosolids are Waste ProductHigh Cost for DisposalHigh Cost for DisposalRestrictions on HandlingRestrictions on HandlingSludge Handling Capacity LimitedSludge Handling Capacity Limited
SummarySummary
After ProjectAfter ProjectBiosolids are ResourceBiosolids are ResourceCapacity Available to Attract CustomersCapacity Available to Attract CustomersFuel to Make BiogasFuel to Make Biogas