Nitrogen removal by recycle water nitritation as an attractive alternative for retrofit technologies in municipal wastewater treatment plants.
The recycle water from sludge processing in municipal wastewater treatment plants causes many serious problems in the efficiency and stability of the mainstream process. Thus, the design approach for recycle water is an important part of any biological nutrient removal system design when a retrofit technology is required for upgrading an existing plant. Moreover, the application of nitrogen removal from recycle water using the nitritation process has recently increased due to economic reasons associated with an effective carbon allocation as well as the minimization of aeration costs. However, for the actual application of recycle water nitritation, it has not been fully examined whether or not additional volume would be required in an existing plant. In this paper, the addition of recycle water nitritation to an existing plant was evaluated based on a volume analysis and estimation of final effluent quality. It was expected that using the reserve volume of the aeration tank in existing plants, recycle water nitritation could be applied to a plant without any enlargement. With the addition of recycle water nitritation, it was estimated that the final effluent quality would be improved and stabilized, especially in the winter season.
Gil
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Department of Civil, Construction and Environmental Engineering, Apperson Hall, Rm 202, Oregon State University, Corvallis, OR 97331, USA.
Choi
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D003247:Conservation of Natural Resources; D005160:Facility Design and Construction; D009584:Nitrogen / Q000302:isolation & purification*; D010084:Oxidation-Reduction; D014865:Waste Disposal, Fluid / Q000295:instrumentation* / Q000379:methods*; D014872:Water Movements; D014873:Water Pollutants / Q000302:isolation & purification*; D018508:Water Purification / Q000295:instrumentation* / Q000379:methods*
D014873:Water Pollutants; D009584:Nitrogen