Dynamics, mechanisms and countermeasures of nitrous oxide emission at a full scale sewage treatment plant

• Project/Area Number: 25289173
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Civil and environmental engineering
• Research Institution: Kochi University
• Principal Investigator: FUJIWARA TAKU 高知大学, 自然科学系, 教授 (10314981)
• Co-Investigator(Kenkyū-buntansha): TSUTSUI HIROFUMI 東京工科大学, 応用生物学部, 助教 (70620649) ; NISHIMURA FUMITAKE 京都大学, 大学院工学研究科, 准教授 (60283636) ; TERADA AKIHIKO 東京農工大学, 大学院工学研究院, 准教授 (30434327)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000); Fiscal Year 2015: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2014: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2013: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000)
• Keywords: 亜酸化窒素 / 実下水処理施設 / 用排水システム / 生成機構 / 排出動態 / 対策手法

Outline of Final Research Achievements

Nitrous oxide (N2O) emission at a full scale wastewater treatment plant (WWTP) was investigated, in which the same influent sewage was treated by three different activated sludge systems in parallel, to clarify dynamics, mechanisms and countermeasures of the emission. Lower dissolved (D-) N2O concentrations were observed in an anoxic/oxic process with three-step feeding, while higher concentrations were detected at third oxic tank in an anoxic/oxic process. It was also found that sudden decrease of dissolved oxygen concentration induced N2O production in the tank. Evaluation of functional genes associated with N2O production and decomposition indicated that almost no N2O reduction occurred in the oxic tank and dynamics of N2O producing bacteria should be studied more in detail. In conclusion, aeration management is important to mitigate N2O emission from a full scale WWTP.

Research Products

• [Journal Article] CHARACTERISTICS OF EMISSION OF NITROUS OXIDE BY PARTIAL NITRIFICATION-ANAMMOX PROCESS (2014)
  • Author(s): 西村 文武、村角 浩平、楠田 育成、高部 祐剛、水野 忠雄
  • Journal Title: Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) Volume: 70 Issue: 7 Pages: III_243-III_249
  • DOI: 10.2208/jscejer.70.III_243
  • NAID: 130004962640
  • ISSN: 2185-6648
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] 嫌気好気活性汚泥法実施設における亜酸化窒素濃度の時間変動と影響因子の検討 (2016)
  • Author(s): 藤原拓， 陳小強，Sijing JIA，西村文武，寺田昭彦， 筒井裕文， 石川 進
  • Organizer: 第50回日本水環境学会年会
  • Place of Presentation: アスティとくしま
  • Year and Date: 2016-03-17
• [Presentation] Nitrous oxide variations in a full-scale anoxic/oxic wastewater treatment system (2015)
  • Author(s): Sijing JIA, Xiaoqiang CHEN, Hirofumi TSUTSUI, Taku FUJIWARA, Susumu ISHIKAWA, Fumitake NISHIMURA, Shaolan DING
  • Organizer: Water and Environment Technology Conference 2015 (WET2015)
  • Place of Presentation: 日本大学
  • Year and Date: 2015-08-06
  • Int'l Joint Research
• [Presentation] Characteristics of nitrogen removal and nitrous oxide emission through partial nitrification-anammox process (2015)
  • Author(s): Fumitake NISHIMURA
  • Organizer: International Conference on Biofiltration and Bioconversion (Biofiltration-2015)
  • Place of Presentation: 中国・長沙、湖南大学
  • Year and Date: 2015-07-09
  • Int'l Joint Research
• [Presentation] 生物学的硝化反応時における亜酸化窒素生成に及ぼすアンモニア濃度変化の影響 (2015)
  • Author(s): 西村文武. 村角浩平, 水野忠雄, 高部祐剛
  • Organizer: 日本水環境学会年会
  • Place of Presentation: 金沢大学
  • Year and Date: 2015-03-16 – 2015-03-18
• [Presentation] Temporal and spatial variations of nitrous oxide in a full-scale anoxic/oxic process with three-step feeding (2014)
  • Author(s): Q. Zhang, X. Chen, H. Tsutsui, T. Fujiwara, F. Nishimura, S. Ishikawa, S. Ding
  • Organizer: 9th IWA International Symposium on Waste Management Problems in Agro-Industries
  • Place of Presentation: ザ クラウンパレス新阪急高知
  • Year and Date: 2014-11-24 – 2014-11-26