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AnaerobicTreatment_to_post_2010

AnaerobicTreatment_to_post_2010 - A. 1.IntheabsenceofO2,...

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ANAEROBIC WASTEWATER TREATMENT MICROBIOLOGY
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ANAEROBIC WASTEWATER TREATMENT MICROBIOLOGY
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Anaerobic Wastewater Treatment Microbiology A. Anaerobic treatment of organic maBer ‐ Anaerobic digesEon 1. In the absence of O 2 , organic maBer is fermented to carbon dioxide and methane: 2CH 2 O ‐‐‐‐‐‐‐‐> CH 4 + CO 2 2. More than 75% of treatment plants in the US use anaerobic digesEon to reduce the sludge yields, also energy produced. Sludge [though less of it] is sEll produced. Some faciliEes burn the sludge (costly), while other haul it away, e.g. landfill cover, off‐shore dump site, land applicaEon of 'biosolids'. 3. Also used directly for treatment of municipal wastewater, mostly in Europe, and for agriculture/farm wastes. In addiEon, in Europe, used for high organic industrial wastes (e.g. canning/food wastes). 4. GeneraEng energy from refuse, 20 yrs ago energy crisis ‐ from fast growing plants, e.g. kelp; again being considered by USDA, DOE. 5. Municipal solid waste is 60‐70% organic or carbon based. If all the refuse in the US were put into methane digesters 11‐15% of the enEre US energy consumpEon could be saEsfied.
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B. A number of anaerobic process designs are described in the literature. VariaEons are designed to largely to improve the operaEon of the process. 1. ConvenEonal flow through process θ = θ c = 6 to 30 days 2. Anaerobic contact process θ = 0.5 several days 3. Anaerobic filter θ = few hours, θ c = ~100 days 4. Upflow anaerobic sludge blanket (UASB) Anaerobic fluidized bed (low strength wastewater) All of these can separate the hydraulic reten.on .me from the cell reten.on .me . This is more important when the process is being used for waste treatment rather than when it is used for solids or sludge reducEon.
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