下水処理廃棄汚泥の固体培養処理と乾燥

概要

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Digesed sludge producted from wastewater treatment plants in Osaka was subjected to aerobic solid state cultivation to obtain fertilizer or improver of farm soil. Species of Fusarium and Streptomyces were selected as the inoculum for alkaline (pH 12) and acidic sludge (pH4.2,treated with Fe^<2+> and H_2O_2). Both digested sludges immediately after production were almost free from aerobic microorganisms. The seed culture obtained using and same sludge was mixed with equal or ten time weight of digested sludge. Wood chips or sawdust was added to the sludge in 5 to 10% by weight to enhance the aerobic state. The mixture was piled up in a mound on air pipe with many holes. The test was done on a scale of 2 to 3 tons and the average atmospheric temperature at noon during the test was 8〜14℃. The piled sludge generated heat in 4 to 9 days, and the temperature rose to 55〜66℃. Then, compressed air was blown to dry the mixture.The dried sludge appeared to be soil rich in humic materials, but showed much less colloidality than the original digested sludge. It was easy to handle and transport. However, the ratio of C/N was changed by the culture, being somewhat decreased in the acidic sludge and considerably increased in the alkaline sludge. In the dried sludge, various microorganisms other than the inoculum were observed.
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