Intermittent On/Off Aeration
- Determination of Denitrification Rate
- Effluent Quality of Ashland WWTP Before and After On/Off Intermittent Aeration
- Denitrification Efficiency of Intermittent On/Off Aeration
- A 24 hour cycling monitoring
- A pilot test of effluent water-level control technology
- Cost Saving
- Summary
- Table of Figures
- Table of Tables
Biological Phosphorus Removal Design
- Characterization for Evaluation
- Potential Test
- Demonstration of Intermittent On/Off Aeration
- Biological Nutrient Removal Theory and Design
- Design of Biological Nutrient Removal Processes
- ENBIR computer-design program
Demonstration of Intermitttent On/Off Aeration at a Municipal Wastewater Treatment Plant for Denitrification and Energy Savings
Final Report
Description of Ashland Wastewater Treatment Plant
The city of Ashland is located in northern Wisconsin with a population of about 8,500. The Ashland WWTP receives mostly domestic wastewater. No industrial wastewater influent has been reported. The design flow is 1.92 MGD and the average plant flow is 1.0 MGD. Biological treatment of the wastewater takes place in two circular oxidation ditches with centered clarifiers. The outside radius of the oxidation ditches are 52 ft while the inside radius is 27 ft. The water depth is 15 ft. Thus, each oxidation ditch has an effective aeration basin of 113,040 ft3 (0.85 MG). The oxidation ditches are aerated by jet aerators with 12 nozzles each. Flow from the oxidation ditches enters the final clarifiers. The flow comes up through the center and slowly moves to the outside of the clarifiers. The final effluent is then discharged into Lake Superior.
More information on this topic: Gerry Novotny
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