EFFECTS OF TOTAL SOLIDS CONCENTRATION ON MESOPHILIC ANAEROBIC DIGESTION OF DEWATERED MUNICIPAL SEWAGE SLUDGE

  • HIDAKA Taira
    独立行政法人土木研究所 材料資源研究グループ
  • TSUMORI Jun
    独立行政法人土木研究所 材料資源研究グループ

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  • 都市下水処理場の脱水汚泥の中温嫌気性消化に及ぼす固形物濃度の影響
  • トシ ゲスイ ショリジョウ ノ ダッスイ オデイ ノ チュウオン ケンキセイ ショウカ ニ オヨボス コケイブツ ノウド ノ エイキョウ

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Abstract

 Co-digestion of sewage sludge and regional organic waste, such as kitchen garbage, is a promising energy recovery method for small facilities. Dewatered sludge is effective for transporting sewage sludge to a centralized wastewater treatment plant. Effects of substrate concentration on mesophilic anaerobic digestion performance and characteristics of digested sludge were investigated by a continuously operated experiment fed with dewatered sludge of approximately 20 (undiluted) – 5% total solids (TS). Substrate concentration less than 10% TS resulted in stable operation with methane production of 0.47 NL/ gVS, viscosity less than 5 dPa·s, and ammonia concentration less than 3, 000 mgN/ L. Substrate concentration greater than 15% TS resulted in digested sludge of more than 10% TS and unstable performance with accumulation of volatile fatty acids.

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