紙・パルプ工場により排出される微細繊維のメタン発酵による処理

概要

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Paper-mill waste sludge (settled or filtrated cake of straw pulp, KP, CGP, waste paper, white water and bark) were treated under thermophilic and mesophilic digestion. Raw sludge contained 50〜70% of crude fiber in volatile matter.These waste sludges were broken down producing 150〜600ml of gases per g of volatile matter after about 10 days of thermophilic batch-wise digestion.As nutrient matter for the continuous digestion, effects of pepton, soya-bean acid hydrolysate press cake (SAH) and activated sludge were investigated useing 5% of cellulose powder solution. It was found that activated sludge was more effectively than the other nutrients.Then, 2 and 4% of activated sludge was added to raw waste sludge contained 2.5% of volatile matter and these mixtures were used for digestion test.Under thermophilic digestion, 40〜70% of crude fiber in waste sludge was broken down and 300〜500ml of gas per g of crude fiber were produced, the gas contained about 70% CH_4.The sludge, after treatment by anaerobic digestion, was settled rapidly and the settled volume was reduced to 1/3〜1/2 of the original. Thermophilic digestion was better than mesophilic in the breaking down of volatile matter and gas production.
社団法人日本生物工学会の論文
1967-07-25