Earl J. Kenzie, P.E., Ann Arbor WWTP Manager Nicole B. Spieles ...
Earl J. Kenzie, P.E., Ann Arbor WWTP Manager Nicole B. Spieles ...
Earl J. Kenzie, P.E., Ann Arbor WWTP Manager Nicole B. Spieles ...
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<strong>Earl</strong> J. <strong>Kenzie</strong>, P.E., <strong>Ann</strong> <strong>Arbor</strong> <strong>WWTP</strong> <strong>Manager</strong><strong>Nicole</strong> B. <strong>Spieles</strong>, P.E., Greeley and HansenMWEA <strong>Ann</strong>ual ConferenceTuesday, June 28, 2011
<strong>Ann</strong> <strong>Arbor</strong> <strong>WWTP</strong> Background•West Plant (9.5 MGD): 1937 - 1939•East Plant (20 MGD): 1977 - 1981•Serves City of <strong>Ann</strong> <strong>Arbor</strong> andTownships of <strong>Ann</strong> <strong>Arbor</strong>, Pittsfield andScio
<strong>Ann</strong> <strong>Arbor</strong> <strong>WWTP</strong> Background•Modified A/O process‣Activated sludge‣Biological phosphorus removal•Tertiary filtration•UV disinfection
<strong>Ann</strong> <strong>Arbor</strong> <strong>WWTP</strong> Background
History of Biosolids Management• 1960s:• 1970s:• 1980s:• 1990s:Digestion/IncinerationLand application (liquid) anddigestion/incinerationIncineration and landfillingLand application (liquid) in nonwintermonths; incinerationotherwise• Current: Land application (liquid) in nonwintermonths; dewatering andlandfill otherwise
Former Solids Handling Facilities• Three Gravity Thickeners (Comingled)• Four Sludge Holding Tanks• Lime Stabilization (Liquid Biosolids)• Three Plate and Frame Presses
Former Solids Handling Facilities
Former Solids Handling Facilities
Former Solids Handling Facilities
Former Solids Handling Facilities
Project Drivers•Existing systems became obsolete•Increasing O&M costs•Declining operating efficiencyLABOR INTENSIVE!
Project Study•Stakeholder Engagement‣Plant Staff‣Community Members•Selection Criteria‣Operating History‣O & M‣Aesthetics‣Implementation•Alternatives Evaluation
Project Design•Stakeholder Engagement•Site Visits to <strong>WWTP</strong>s•Pilot Testing•Project Workshops
Design Goals•Provide process flexibility•Improved efficiency•Removal of obsolete equipment•Reuse of existing facilities
Removal of Obsolete Equipment
Removal of Obsolete Equipment
Construction•Schedule‣Construction Start: February 2009‣Anticipated Completion: October 2011•Budget‣Bid: $42,444,927‣Change Orders: $500,000 to date
Construction Challenges•Maintaining plant operations‣Temporary Liquid Biosolids LoadingStation‣Temporary Cake Conveyor‣Temporary Ferric Chloride Tank•Retrofit of new equipment into existingstructure
Temporary Liquid BiosolidsLoading
Temporary Cake Conveyor
Temporary Ferric Chloride Tank
New Solids Handling Facilities• Rehabilitated Gravity Thickener (primarysludge)• Converted Two Gravity Thickeners toBlend Tanks• Two New Gravity Belt Thickeners (WAS)• Three New Centrifuges• New Truck Loading Facility• New Odor Control Equipment
Gravity Thickener Tank
Blend Tanks
Gravity Belt Thickeners
Centrifuges
Solids Handling Building BeforeAddition
New Truck Loading Facility
New Truck Loading Facility -Cake Lime Addition
New Truck Loading Facility –Liquid Biosolids Loading
New Truck Loading Facility -Cake Loading
Odor Control
Benefits - Solids Concentrations40353025201510ThickeningDewateringDewatering Chemicals50Pre-project averagePost-project average
Benefits – Biosolids Storage1,2001,000800600400Thickened biosolids(mGal)Dewatered cake (CY)2000Pre-project volumePost-project volume
How Staff Adapted•New Equipment & Processes•Management Strategy Changes•Staff Scheduling
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