Studies on Operational Conditions for Single-stage Nitrogen Removal Process using the Anammox Reaction

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  • Okamoto Hiroyuki
    Research & Development Laboratories for Sustainable Value Creation, Asahi Breweries, Ltd.
  • Nomura Atsuko
    Research & Development Laboratories for Sustainable Value Creation, Asahi Breweries, Ltd.
  • Nishimura Toshio
    Research & Development Laboratories for Sustainable Value Creation, Asahi Breweries, Ltd.
  • Uchihashi Yasumitsu
    Research & Development Laboratories for Sustainable Value Creation, Asahi Breweries, Ltd.
  • Miyahara Teruo
    Research & Development Laboratories for Sustainable Value Creation, Asahi Breweries, Ltd.
  • Sato Hideaki
    Research Laboratories for Food Technology, Asahi Breweries, Ltd.
  • Nishiyama Takashi
    Department of Applied Life Science, Sojo University
  • Fujii Takao
    Department of Applied Life Science, Sojo University
  • Furukawa Kenji
    Graduate School of Science and Technology, Kumamoto University

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Other Title
  • 一槽式ａｎａｍｍｏｘリアクタの運転条件に関する研究
  • イッソウシキ anammox リアクタ ノ ウンテン ジョウケン ニ カンスル ケンキュウ

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Abstract

This study was carried out into unexpected nitrogen removal in a fixed bed partial nitrification process, which is an essential pretreatment process for anaerobic ammonium oxidation (anammox). Two statistical methods, multiple regression analysis and the response surface method by spline (RSM-method), were applied to identify the main operational factors for this efficient one-step nitrogen removal using the anammox process. The RSM-method shows the requirements for higher removal rate using explanatory variables with high contribution values. It was found that nitrogen removal rates were obtained under high aeration rates and high flux of influent. It will be possible to attain a high volumetric removal rate of 1.5–2.9 kg-NH4–N/(m3·d) in this reactor. New anammox bacteria (Asahi-BRW) were detected in this swim-bed reactor, with few detected in the sludge from this reactor. Ammonium oxidizing bacteria, including many types of Nitrosomonas europaea, were detected in free sludge from this reactor.

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