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Treat the Symptom or the Disease
Big choice Do you / can you prevent it from ever happening? Potential huge cost ramifications
Where is it coming from?
Different processes have different smells Once ID, how do you collect odor laden air? If contain, then corrosion?
Treatment Options
Chemicals Caustic, Hydrogen Peroxide, Bioxide or equivalent
Scrubbers Masking Agents Salts Enzymes Carbon Ozone Seal it and forget it.
Case #1 – Feasibility Study
What about using the odor laden air? Collect and use as feed air for treatment process Caution needed
Quantity of air constant vs. end use
Quality of air Depends on source
Potentially cost effective Understand risks
Case #2 – NKSA Collection EPA recommends laminar flow of wastewater Significant Odor Issue System Sealed to prevent odor complaints Collection System failure(s) from H2S Corrosion
Case #2 – NKSA Collection Proposed Alternate
System Reconstruction Required
Add carbon filters and open the system up
Add re-aeration to system (turbulence)
Use available grade Prevent from becoming
anaerobic
Case #2 – NKSA Collection
Results Eliminated odor
complaints No active odor
treatment in reconstructed lines
Eliminated H2S generation
Reduced overall construction cost
Case #3 – NKSA Four Mile LS
Original Built in 1968 Significant Odor and
Corrosion Problem Located in Residential
Neighborhood Previously Tried
Chlorine Scrubber Station Sealed
Case #3 – NKSA Four Mile LS
Biofilter Treatment for wet well 150 ppm ave. Hydrogen
Sulfide, Mercaptans Air Volume = 2,000 scfm Two Modules (package) 36 second bed time Negative pressure Redundant blowers Roof Discharge
Case #4 - MCWMS
Rehab of Existing Odor Stripper and Treatment Rehab odor reduction building Replace control gates and mixers Update electrical Address issues with significant chamber corrosion Still issue with channels – long term proposed to cover Estimated cost ~$750,000
Proposed alternate – eliminate both!
Case #4 - MCWMS
Alternate - Plant Feed Rerouting Prevent the odor from ever getting to the air Simple No active treatment system, eliminate existing system Complete as part of overall system improvement Eliminate O&M costs Capital cost ~$600,000
Case #5 – NKSA CWP
Process Control NKSA Biosolids Holding Tanks Avoid odor issues Minimize Energy Accomplish with Process Control
SCADA with DO and ORP probes Cost – Minimal cost for probe and
programming Saving – Significant reduction in
operating costs
Case #6 – NKSA CWP
Biofilter Treatment for Headworks and Solids Handling Rooms Air Volume = 15,000 scfm Hydrogen Sulfide, VOCs, Mercaptans, Ammonia 30 second bed time Built in Place – equipment cost 310K Positive Pressure Redundant blowers w/VFDs
Cost of Biofilter Equipment = $310,000*
Case #6 – NKSA CWP
Lower Irrigation Maintain negative pressure in rooms
Upper IrrigationLower Irrigation