Green treatment of electronic industrial wastewater containing toxic chemicals by advanced utilization of anaerobic bacterial consortium

2022 Fiscal Year Final Research Report

• Project/Area Number: 20H04366
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 64020:Environmental load reduction and remediation-related
• Research Institution: National Institute for Environmental Studies
• Principal Investigator: SYUTSUBO KAZUAKI 国立研究開発法人国立環境研究所, 地域環境保全領域, 副領域長 (80293257)
• Co-Investigator(Kenkyū-buntansha): 竹村 泰幸 国立研究開発法人国立環境研究所, 地域環境保全領域, 特別研究員 (10837199)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: メタン発酵 / 有機化学物質 / 常温処理

Outline of Final Research Achievements

As a result of this research, while supplying easy degradable organic substances (sugars, volatile fatty acids), organic chemicals (iso-propyl alcohol:IPA, tetramethylammonium hydroxide:TMAH, monoethanolamine:MEA) are gradually mixed with wastewater to acclimatize the sludge resulted successful methanogenic treatment of synthetic electronics industrial wastewater at ambient temperature. Finally, the UASB (Upflow Anaerobic Sludge Blanket) achieved an organic load of 8.6 kgCOD/m3/day and a high COD removal efficiency of 96% under the ambient temperature. Also, important findings for operation management of the UASB were obtained, such as that an increase in the content of TMAH in wastewater leads to deterioration of the physical properties of retained sludge, and that an increase in the content of MEA is effective in improving the physical properties. Furthermore, we succeeded in obtaining novel TMAH-degrading methanogenic strain that is effective for the early start-up of the UASB.

Free Research Field

環境工学

Academic Significance and Societal Importance of the Research Achievements

本研究では、省・創エネルギー型の廃水処理技術であるUASB法の適用がなされていない有機化学物質を含有する電子産業廃水に対しての同手法の適用手段の基礎を確立したもので、産業廃水の低炭素化、資源循環に貢献するものである。また、当該廃水に含まれる有機化学物質（IPA, TMAH, MEA）の嫌気分解特性や分解細菌群についての新たな基礎知見は、学術的に大きな意義を持つ。新たに取得したTMAH分解古細菌は、TMAHを含む廃水の嫌気性処理における植種菌やバイオレメディエーションにも応用可能で産業利用上も有用である。