Factors Affecting Performance of Alcaligenes faecalis in Activated Sludge Process under Aerobic Conditions.

• WU Xiao-Lei

  The Science and Technology Promotion Foundation of Ibaraki

• INAMORI Yuhei

  National Institute for Environmental Studies

• EBISUNO Toichi

  Faculty of Science, Toho University

Bibliographic Information

Other Title

• Ａｌｃａｌｉｇｅｎｅｓ　ｆａｅｃａｌｉｓを導入した好気活性汚泥法におけるＮ２Ｏ放出および窒素除去特性
• Alcaligenes faecalis オ ドウニュウ シタ コウキカッセイ オデイホウ ニ オケル N2O ホウシュツ オヨビ チッソ ジョキョ トクセイ

Abstract

Immobilized Alcaligenes faecalis, a typical heterotrophic nitrifier, was added into activated sludge to make A. faecalis predominant genus in the activated sludge. Responses of the systems to variation of DO, pH and quantities of inoculated A. faecalis were tested and behaviors of the systems were evaluated. Experimental results showed that: the systems containing A. faecalis generally produced N₂O 5 times less than those containing only activated sludge. In addition, the systems containing A. faecalis had a higher total nitrogen removal capability, average total nitrogen removal efficiencies of them were 10% higher than those of the activated sludge systems. Little influences appeared to TOC removal after the addition of immobilized A. faecalis. Among the experimental conditions, low DO concentration, high amount of A. faecalis and neutral pH led to low N₂O emission and high total nitrogen removal. Therefore, increasing quantity of A. faecalis in activated sludge should be encouraged for controlling N₂O emission and removing nitrogen in wastewater treatment. N₂O producing ways were put forth to explain the influences of DO on N₂O emission, and relative quantities of autotrophic nitrifying denitrifying organisms and heterotrophic nitrifiers were suggested to have significance in affecting behaviors of activated sludge toward N₂O emission. On the other hand, serious accumulation of NO₂-N and NO₃-N resulted in high N₂O emission, to reduce NO₂-N and NO₃-N quickly and thoroughly was thus suggested for both reducing N₂O emission and improving nitrogen removal.

Journal

• Journal of Japan Society on Water Environment

  Journal of Japan Society on Water Environment 22 (3), 215-221, 1999

  Japan Society on Water Environment

Keywords

• global warming
• nitrous oxide (N₂O)
• nitrification
• denitrification
• wastewater treatment

Details

• CRID: 1390001205081513344
• NII Article ID: 10004451920
• NII Book ID: AN10372439
• DOI: 10.2965/jswe.22.215
• COI: 1:CAS:528:DyaK1MXivF2jtLY%3D
• ISSN: 18813690
• ISSN: 09168958
• ISSN: http://id.crossref.org/issn/09168958
• NDL BIB ID: 4682954
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4682954
• Web Site: https://www.jstage.jst.go.jp/article/jswe/22/3/22_3_215/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed