Biomethanation of Spent Wash : Bacterial Pretreatment to Remove Heaby Metals by Adsorption

概要

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In a semicontinuous fermentation system, biomethanation of diluted spent wash (DW, initial COD 25-27 g/l) resulted in only 0.2 l/l of methane production in 20 d. Two capsular Gram-negative strains of bacteria were used for adsorption of heavy metals such as lead, copper, and zinc from spent wash. Strain I removed 64% of the lead in 1 h and 82% of the copper in 2 h, while strain II removed 76% of the zinc in 2 h. The diluted spent wash from which heavy metals were removed was supplemented with synthetic medium and an acidophilic strain of Candida sp. This treatment improved methanogenesis. In 12 d, 4.9 l/l of biogas containing 63% methane was produced.
社団法人日本生物工学会の論文
1990-05-25