Treatment of raw sewage in a temperate climate using a UASB reactor and the hanging sponge cubes process

Lalit K. Agrawal, Yasuhiro Ohashi, Etsuo Mochida, Hiroyuki Okui, Yasuko Ueki, Hideki Harada, Akiyoshi Ohashi

研究成果: Conference article

76 引用 (Scopus)

抜粋

The treatability of raw sewage in a temperate climate (wintertime around 10-20°C) using an upflow anaerobic sludge blanket (UASB) reactor and the hanging sponge cubes process was evaluated. After being seeded with digested sewage sludge, a 47.1 L UASB reactor was continuously operated for more than 2 years by feeding raw sewage, which had average COD around 300 mg/L (41% soluble). During summertime at an HRT of 7 h, effluent COD approximately 70 mg/L total, 50 mg/L soluble and BOD5 20 mg/L total, 12 mg/L soluble was obtained. During wintertime also, treatment efficiency and process stability was good. With the hanging sponge cubes process using the effluent of the UASB reactor treating raw sewage, the following results were obtained. The ammonia oxidation rates of 1.9 and 3.5 g NH4-N·m-2·d-1 in a downflow hanging sponge cubes biofilter, under natural air intake only were obtained during wintertime and summertime, respectively. With post-denitrification and an external carbon source, 84% in average N(NO3 + NO2) was removed with an HRT of less than 1 hour and in the temperature range of 13 to 30°C using an upflow submerged hanging sponge bed bioreactor, under anaerobic conditions. The overall system using a UASB reactor and the hanging sponge cubes process could be quite an attractive treatment alternative.

元の言語English
ページ(範囲)433-440
ページ数8
ジャーナルWater Science and Technology
36
発行部数6-7
DOI
出版物ステータスPublished - 1997 12 17
イベントProceedings of the 1997 8th IAWQ International Conference on Anaerobic Digestion - Sendai, Jpn
継続期間: 1997 5 251997 5 29

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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