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USING CENTRATE NITRIFICATION TO REDUCE ODORS AT THE 91st AVENUE WWTP

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While some municipalities use Bioxide® (nitrate salts) to control odors from wastewater by oxidizing hydrogen sulfide (H2S) or preventing its formation, the City of Phoenix (City) conceived the idea of discharging nitrite/nitrate (NOx) rich, treated dewatered sludge centrate to the headworks of its 91st Avenue Wastewater Treatment Plant (WWTP) to reduce H2S emissions. The primary reason for incorporating dedicated centrate treatment into the plant's process flow scheme was to reduce the ammonia load on the main activated sludge facilities through ammonia oxidation in a separate nitrification reactor and discharge of the oxidized nitrogen to the plant headworks for subsequent denitrification. However, full-scale testing and preliminary air dispersion modeling results indicate that the City may be able to avoid a 30 million capital expenditure for a traditional odor control system by achieving dual benefits from this process.
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Document Type: Research Article

Publication date: 2003-01-01

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