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Sludge Happens. Louise Heffernan Metropolitan Council Environmental Services . Empire Wastewater Treatment Plant Anaerobic Digester Pilot Project. Introduction. Empire wastewater facility Dewaterability issues Designed to produce cake solids content~16-18% Recent years ~ 11-12%

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empire wastewater treatment plant anaerobic digester pilot project
Louise Heffernan

Metropolitan Council

Environmental Services

Empire Wastewater Treatment Plant Anaerobic Digester Pilot Project
introduction
Introduction
  • Empire wastewater facility
  • Dewaterability issues
  • Designed to produce cake solids content~16-18%
  • Recent years ~ 11-12%
  • Storage pad usage, hauling and land application
  • Impacts operational costs
why does this matter
Why does this matter?
  • Empire current operations
    • 11% cake – $310,000/year land application cost
  • Target operations
    • 18% cake – $200,000/year land application cost
purpose
Purpose
  • Evaluate treatment options
  • Improve dewaterability
  • Establish stable pilots
  • Monitor performance
  • Gather data
  • Analyze system results
  • Examine methods to achieve target cake
  • Implement at the Empire WWTP
biofloc makeup
Biofloc Makeup
  • Bacteria only make up 10-20% of the organic matter mass in a floc
  • Most of the remainder is biopolymer (protein and polysaccharides)

Higgins, 2012

chemical addition treatments
Chemical Addition Treatments
  • Chemical conditioning prior to BFP
  • Alter biomass matrix
  • Good floc formation and settling
    • DCB negatively charged biopolymers
  • Lower soluble P
stored thickened was treatment
Stored/Thickened WAS Treatment
  • Current practice at Empire
    • WAS is thickened, accounts for 50% digester feed
    • Not stored at any point
  • S.T.WAS treatment
    • Unaerated storage of WAS prior to thickening
    • Allows time for P, K, Mg release
    • Removal prior to digestion
  • Research suggests dewatering ability linked to cation concentration
pilot test variables
Pilot Test Variables
  • Pilot # 1 : Stored/Thickened WAS (S.T.W.A.S.)
    • Unaerated storage > 4 days
  • Pilot # 2 : Chemical addition (FeCl3)
  • Pilot # 3 : Control
  • Pilot # 4 : Chemical addition (MgCl2)
summary and conclusions
Summary and Conclusions
  • Empire has low cake solids (11-12%)
  • Potential methods to improve dewaterability investigated
  • System will continue to run past 3 SRTS
  • Results from 2013 pilot digesters:
    • Stability was achieved
    • All treatments showed decrease in soluble P and K
    • All treatments showed increase in cake solids
    • Dewatering performance below target values
recommendations
Recommendations
  • Must investigate more alternatives to achieve 18%
  • Future option: STWAS & chemical addition
  • Thermal pretreatment technologies
  • Other chemicals
    • Mg(OH)2
my experience
My Experience
  • Networking opportunities
  • Communicate with wide range of professionals
  • Great educational experience
  • Met Council tours
  • Lead into independent study