Continuous Anaerobic Treatment of Wastewater from a Kraft Pulp Mill
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概要
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A pilot-scale study of the thermophilic anaerobic digestion of high-strength wastewater(evaporator condensate, EC)discharged form a kraft pulp production process was performed. The system consisted of a microfiltration(MF)membrane module for oily substances removal, a stripping system using evolved gas from the digester for sulfue compounds removal, an anaerobic fixed-bed bioreactor for methane fermentation, and an ultrafiltration(UF)membrane module for retention of a high density of bacterial cells. The bioreactor had a fixed-bed with an effective volume of 5 m^3 packed with pumice stone. In a continuous run with only the MF membrane module for oily substances removal, the digester efficiency declined because of methanogenic inhibition by sulfur compounds. After fitting of the stripping system which used evolved gas from the digester, the inhibitive sulfur compounds in the EC were removed more than 80%, and high-loading and high-efficiency operation could be attained. The BOD loading and BOD removal of 35.5kg BOD/m^3/d and 93%, respectively were attained. By anaerobic treatment of the evaporator condensate waste before the conventional aerobic activated sludgs method, the total costs would be reduced to \3.31/m^3 wastewater compared with \4.53/m^3-wastewater by the aerobic activated sludge method only. The stability of digester performance against interruption by feed stoppage was also examined.
- 社団法人日本生物工学会の論文
- 1991-04-25
著者
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Naritomi T
Bio‐polymer Res. Co. Ltd. Kawasaki‐shi Jpn
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NARITOMI TAKAAKI
Institute of Technology, Shimizu Corporation
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Okamura K
Advanced Technology Research Department Institute Of Technology Shimizu Corporation
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Okamura Kazuo
Institute Of Technology Shimizu Corporation
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MINAMI KIYOSHI
Advanced Technology Research Department, Institute of Technology, Shimizu Corporation
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MINAMI KIYOSHI
Institute of Technology, Shimizu Corporation
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OGAWA SHIGEMICHI
Institute of Technology, Shimizu Corporation
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Naritomi Takaaki
Institute Of Technology Shimizu Corporation
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Okamura K
Mercian Corp. Kanagawa Jpn
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Minami K
Shimizu Corp. Tokyo Jpn
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Minami Kiyoshi
Institute Of Technology Shimizu Corporation
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Ogawa Shigemichi
Institute Of Technology Shimizu Corporation
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