Sludge Solubilization and Reduction of Excess Sludge Production in Night Soil Treatment Plants using Chemical and Biological Treatments

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  • Yamaguchi Toyoshi
    Environmental Process Research Dept., Steel Research Laboratory, JFE Steel Corporation
  • Tomida Yohei
    Technology Headquarters, JFE Engineering Corporation
  • Shirage Hirokazu
    Aqua Solution Sector, Domestic Business Division, Plant Engineering Dept., JFE Engineering Corporation

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  • 薬剤と微生物処理を併用したし尿汚泥の減量化技術の開発
  • ヤクザイ ト ビセイブツ ショリ オ ヘイヨウ シタ シニョウ オデイ ノ ゲンリョウカ ギジュツ ノ カイハツ

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A novel sludge solubilization process was applied to the reduction of excess sludge production in night soil treatment plants. Chemical and biological treatments were used to reduce excess sludge. In the first step, the sludge was pretreated with alkali to enhance biological reduction. In the second step, the sludge was reduced by biological treatment. Many kinds of sludge degrading microorganisms were integrated into the sludge. The solubilization properties of batch treatment with alkali were evaluated in terms of the excess sludge in two night soil treatment plants. Successive treatments of alkali and biological solubilization were conducted. The excess sludge was solubilized approximately 30-50 % during the experimental period. This solubilization efficiency indicated that this process was able to reduce excess sludge production in night soil treatment plants.

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