Biological nitrogen removal from industrial wastewater discharged from metal recovery processes

A. Hirata*, Y. Nakamura, S. Tsuneda

*この研究の対応する著者

研究成果: Article査読

31 被引用数 (Scopus)

抄録

The wastewater generated from the processes of recovering precious metals from industrial wastes contains high concentrations of acids and alkalis such as nitric acid and aqueous ammonia, and of salts such as sodium chloride and sodium sulfate. Biological nitrogen removal from this wastewater was attempted by using a circulating bioreactor system equipped with an anaerobic packed bed and an aerobic three-phase fluidized bed. As a result of acclimating microorganisms with change of the hydraulic residence time, this system effectively removed nitrogen from diluted wastewater (T-N: from 2,000 to 4,000 g/m3), such that the total nitrogen concentration in the effluent met the sewage discharge control criteria in Japan (240 g/m3). The removal ratio of total nitrogen was 90% to 98% and that of ammonia was 80% to 92%. In addition, the characteristics equations for biological treatment were applied to this system on the assumption that both reactions of denitrification in the anaerobic reactor and nitrification in the aerobic reactor can be approximated to a first-order reaction. This simplified approach successfully led to a new analytical method for simulating the optimum volume ratio of anaerobic reactor to aerobic reactor for minimizing the total hydraulic residence time.

本文言語English
ページ(範囲)171-179
ページ数9
ジャーナルWater Science and Technology
44
2-3
DOI
出版ステータスPublished - 2001

ASJC Scopus subject areas

  • 環境工学
  • 水の科学と技術

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