Methane gas production from fishmeal factory wastewater.
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概要
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Fishmeal factory wastewater (FFW) was anaerobically fermented. Volatile solid (VS) and BOD of FFW were 78, 200mg/l and 60, 100mg/l, respectively. BOD/VS ratio was 0.77. It was thought that FFW is subjected to biochemical degradation. But, constant methane production was low because of containing colloidal protein in the proportion of 80% to VS. The authors made it possible by development of the following processes.<BR>1) The colloidal protein from FFW was aggregated to remove by addition of acetic acid in the proportion of 1%.<BR>2) Methane gas was constantly generated by removing NH<SUB>3</SUB> and H<SUB>2</SUB>S from digested water by stripping using H<SUB>2</SUB>SO<SUB>4</SUB> and Fe<SUB>2</SUB>O<SUB>3</SUB> as adsorbents. Gas production ratio was 0.62l/g-VS. On the methane gas production of FFW, the removal ratio of BOD and COD were 91.4%, 40.4% respectively.
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