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1000 Friends of FloridaPresentation on May 12, 2005Presenter: Kart Vaith/CDM vaithk@cdm.com: 

1000 Friends of Florida Presentation on May 12, 2005 Presenter: Kart Vaith/CDM vaithk@cdm.com

Wastewater Treatment can be really simple and it is in all our control: 

Wastewater Treatment can be really simple and it is in all our control “Quit Producing it (and we’ll find ways to quit treating and getting rid of it )” QUOTE AT MANY WASTEWATER OPERATOR TRAINING SCHOOLS

Wastewater treatment plant effluent has only two places to go: surface water and/or groundwater: 

Wastewater treatment plant effluent has only two places to go: surface water and/or groundwater What we do with the treated wastewater defines what’s needed for treatment Groundwater Discharges: Land Application (slow rate) Reuse, etc. Land Application (high rate) Rapid infiltration basins Exfiltration trenches, etc. Injection Surface Water Discharges Wetlands Treatment Systems Into surface water bodies Biosolids Treatment requirements are defined similarly, and are not considered in this presentation

Wastewater disposal application rates and effluent parameter limits are dictated by stringent FDEP regulations: 

Wastewater disposal application rates and effluent parameter limits are dictated by stringent FDEP regulations

Wastewater Treatment technologies must consider effluent disposal needs: 

Wastewater Treatment technologies must consider effluent disposal needs

Conventional Wastewater Treatment will meet reasonable effluent parameters of 20/20/10* : 

Conventional Wastewater Treatment will meet reasonable effluent parameters of 20/20/10* NH3 O2 NO3 O2 O2 O2 O2 O2 O2 O2 O2 BOD Biomass Secondary Clarifier Clarified Effluent 10-20 mg/l N Excess Biomass (6 – 10 % N) * Wastewater effluent concentrations are reported as BOD/TSS/N/P

Biological Nutrient Removal (BNR) wastewater treatment will remove a high percentage of total nitrogen: 

Biological Nutrient Removal (BNR) wastewater treatment will remove a high percentage of total nitrogen Aerobic (C removal) Anoxic (N removal) N2 NO3 Food NO3 NO3 NO3 NO3 NO3 NO3 NO3 NO3 NO3 NO3

Environmental Conditions For Denitrification must be Created for Nitrogen Removal: 

Denitrifying (facultative heterotrophic) bacteria Food (BOD or methanol) Nitrate No oxygen Environmental Conditions For Denitrification must be Created for Nitrogen Removal Anoxic Condition

Modified Ludzack-Ettinger (MLE) can meet limits of 5/5/6: 

Modified Ludzack-Ettinger (MLE) can meet limits of 5/5/6 Secondary Clarifier Aeration Return Activated Sludge Sand Filter Waste Activated Sludge Anoxic

5-Stage Bardenpho™ can produce effluent parameters of 5/5/3/1: 

5-Stage Bardenpho™ can produce effluent parameters of 5/5/3/1 Secondary Clarifier Aeration Return Activated Sludge Sand Filter Waste Activated Sludge Anoxic Anaerobic Anoxic Reaeration Internal Recycle

3-Stage Bardenpho™ w/ Denitrification Filters can produce an effluent of 5/5/2/1: 

3-Stage Bardenpho™ w/ Denitrification Filters can produce an effluent of 5/5/2/1 Secondary Clarifier Aeration Return Activated Sludge Sand Filter Waste Activated Sludge TRADITIONAL Secondary Clarifier Aeration Return Activated Sludge Denitrification Sand Filter Waste Activated Sludge Anoxic Anaerobic Internal Recycle Methanol

Choosing the right technology for implementation is critical to manage utility rates: 

Choosing the right technology for implementation is critical to manage utility rates

In conclusion, planning to meet effluent limits will drive level of treatment, but there are limits: 

In conclusion, planning to meet effluent limits will drive level of treatment, but there are limits Treating to the appropriate level is important, difficult to treat better than 5/5/2 Over treating can result in additional costs for no benefit: Treating with a nutrient removal process and then disposing the effluent through reuse may require fertilizer addition Determining the desired effluent level of BOD, TSS, TN, and TP (if applicable) will allow cost optimization for the ratepayers