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Impact of Thermal Hydrolysis Solids Pretreatment on Sidestream Treatment Process Selection at the DC Water Blue Plains AWTP

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In 2014, the District of Columbia Water and Sewer Authority (DC Water) will begin operating a new solids processing train consisting of thermal hydrolysis pretreatment and mesophilic anaerobic digestion at the Blue Plains Advanced Wastewater Treatment Plant. Dewatering the digested biosolids with belt filter presses will result in a dewatering sidestream (filtrate) with high ammonium-N and VFA concentrations (2,500 to 3,000 mg-N/L of ammonium and VFA potentially in excess of 2,000 mg/L) . Since separate sidestream treatment is required at Blue Plains, a range of physical/chemical and biological treatment systems were reviewed to assess their advantages and disadvantages and to determine if a more concentrated sidestream makes one type of process preferred over another in terms of cost and operability.
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Keywords: air stripping; ammonia; ammonium; centrate; deammonification; filtrate; nitritation; nitrogen; sidestream; thermal hydrolysis

Document Type: Research Article

Publication date: 2010-01-01

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