a new activated sludge process control test uncovers secondary clarifier inefficiencies
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A New Activated Sludge Process Control Test Uncovers Secondary Clarifier Inefficiencies. by E.J. Wahlberg, S. Biesterfeld, G. Farmer, D. Kinnear, L. Robb. The Littleton/Englewood WWTP. Constructed in 1977 as 20 mgd pure oxygen activated sludge plant

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a new activated sludge process control test uncovers secondary clarifier inefficiencies

A New Activated Sludge Process Control Test Uncovers Secondary Clarifier Inefficiencies

by

E.J. Wahlberg, S. Biesterfeld,

G. Farmer, D. Kinnear, L. Robb

the littleton englewood wwtp
The Littleton/Englewood WWTP
  • Constructed in 1977 as 20 mgd pure oxygen activated sludge plant
  • Modified in 1993 to a 32 mgd trickling filter/ activated sludge plant (TF/AS)
  • Upgraded in 1999 to a 36.3 mgd trickling filter/solids contact plant (TF/SC)
  • Currently in pre-design for 50 mgd TF/SC
process objectives in tf sc and activated sludge
Process Objectives in TF/SC and Activated Sludge

To grow a biomass that:

  • Flocculates
  • Settles
  • Compacts
typical approach to activated sludge control inappropriate
Typical Approach to Activated Sludge Control Inappropriate
  • “Performance in the activated sludge process is typically measured by monitoring secondary clarifier effluent for TSS, BOD, COD….”
  • Inappropriate: effluent quality includes secondary clarifier inefficiencies.
modified settleometer test
Modified Settleometer Test
  • Collect secondary clarifier and mixed liquor effluent samples
  • Pour mixed liquor sample into square flocculation jar
  • Mix for 30 minutes at 50 rpm
  • Settle for 30 minutes
  • Record 5 and 30 minute SSV
  • Collect supernatant sample
  • Analyze supernatant and effluent samples for TSS
sludge quality measurements
Sludge Quality Measurements
  • SSV5: Settling characteristic
  • SSV30: Compacting characteristic
  • Supernatant TSS: Flocculating characteristic
flocculated suspended solids
Flocculated Suspended Solids
  • Supernatant TSS (FSS) indicates effluent TSS possible with a perfect secondary clarifier.
  • Difference between FSS and TSS measures clarifier inefficiency
conclusions
Conclusions
  • SSV30 (SVI) may not be appropriate for control
  • FSS better control parameter than TSS
  • Secondary clarifier inefficiencies result in TSS increase between 2 and 10 mg/L
  • Secondary clarifier inefficiency increases with decreasing wastewater temperature
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