Upgrading of anaerobic digestion of waste activated sludge by temperature-phased process with recycle

Li Jie Wu, Yu Qin, Toshimasa Hojo, Yu You Li

研究成果: Article査読

30 被引用数 (Scopus)

抄録

Thermophilic (55°C)-mesophilic(35°C) and hyper-thermophilic(70°C)-mesophilic TPAD-R (temperature-phased anaerobic digestion with recycle) were conducted to compare and evaluate the operation performance to treat WAS (waste activated sludge) with the MD (conventional mesophilic anaerobic digestion). TPAD-R was based on the TPAD (temperature-phased anaerobic digestion), and introduced a recycle system from the end mesophilic stage to the front stage. Thermophilic-mesophilic TPAD-R produced more biogas 0.99L/g VS (volatile solids) reduced/d than MD 0.83L/g VS reduced/d. In thermophilic-mesophilic TPAD-R 35.7% and 18.7% of WAS was converted to methane in the thermophilic stage and in the mesophilic stage, respectively, according to a COD balance. Solids reduction was improved to a similar extent in thermophilic-mesophilic TPAD-R and hyper-thermophilic-mesophilic TPAD-R, which was 10% higher than that in MD (approximately 40% of VS reduction). Hydrolysis, acidogenesis and methanogenesis analysis indicated that thermophilic and hyper-thermophilic stage accelerated the hydrolysis rate of TPAD-R, 0.053gCOD/gVS/d and 0.040gCOD/gVS/d, respectively, compared to about 0.025gCOD/gVS/d in MD. In addition, thermophilic-mesophilic TPAD-R achieved more surplus energy than hyper-thermophilic-mesophilic TPAD-R and MD.

本文言語English
ページ(範囲)381-389
ページ数9
ジャーナルEnergy
87
DOI
出版ステータスPublished - 2015 7 1

ASJC Scopus subject areas

  • 土木構造工学
  • 建築および建設
  • 汚染
  • 機械工学
  • 産業および生産工学
  • 電子工学および電気工学

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