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Methane generation from chemically pretreated cellulose by anaerobic fluidized-bed reactors
AbstractAlkali cooking of cellulose at 10% (w/v) consistency, performed at 250°C, gives a liquor containing organic acids as main components (lactic, acetic and succinic acids). A synthetic substrate, representative of this liquor, was used as feed for two anaerobic fluidized-bed reactors operating at 35°C. The effects of hydraulic retention time and influent substrate concentration on substrate consumption and methane generation were studied. Organic removals of up to 95% and methane generation rates of 1·09 litres CH4 litreR−1 day−1 were achieved at a retention time (θR) of 8·3h and at an influent substrate concentration of 1400 mg COD litre−1. At θR = 3·5 h, conversion decreased to 60%. When feeding the cooked liquor, conversions were slightly lower, around 50% at θR = 4 h and 1300 mg COD litre−1 of influent substrate concentration. However, the methane volumetric production rate was as high as 2·5 litres CH4 litreR−1 day−1 under the same conditions. The results suggest that alkaline cooking with subsequent methane fermentation offers a viable process for the treament of cellulosic materials, such as municipal solid waste.
Methane generation from chemically pretreated cellulose by anaerobic fluidized-bed reactors
AbstractAlkali cooking of cellulose at 10% (w/v) consistency, performed at 250°C, gives a liquor containing organic acids as main components (lactic, acetic and succinic acids). A synthetic substrate, representative of this liquor, was used as feed for two anaerobic fluidized-bed reactors operating at 35°C. The effects of hydraulic retention time and influent substrate concentration on substrate consumption and methane generation were studied. Organic removals of up to 95% and methane generation rates of 1·09 litres CH4 litreR−1 day−1 were achieved at a retention time (θR) of 8·3h and at an influent substrate concentration of 1400 mg COD litre−1. At θR = 3·5 h, conversion decreased to 60%. When feeding the cooked liquor, conversions were slightly lower, around 50% at θR = 4 h and 1300 mg COD litre−1 of influent substrate concentration. However, the methane volumetric production rate was as high as 2·5 litres CH4 litreR−1 day−1 under the same conditions. The results suggest that alkaline cooking with subsequent methane fermentation offers a viable process for the treament of cellulosic materials, such as municipal solid waste.
Methane generation from chemically pretreated cellulose by anaerobic fluidized-bed reactors
Reig, Milagro (author) / Toldrá, Fidel (author) / Tsai, Gow J. (author) / Jansen, Norman B. (author) / Tsao, George T. (author)
Biological Wastes ; 29 ; 201-210
1989-01-09
10 pages
Article (Journal)
Electronic Resource
English
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