Investigation of dissolved organic matter in treated wastewater that affects water reuse in destination water bodies

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K20455
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0303:Civil engineering, social systems engineering, safety engineering, disaster prevention engineering, and related fields
• Research Institution: National Institute for Land and Infrastructure Management
• Principal Investigator: Ishii Yoshihiro 国土技術政策総合研究所, 下水道研究部, 研究官 (10911331)
• Project Period (FY): 2021-08-30 – 2023-03-31
• Keywords: 下水処理 / 溶存有機物 / 精密質量分析 / 微量化学物質 / 下水処理水の非意図的な再利用 / 固相抽出

Outline of Final Research Achievements

In this study, the solid-phase extraction method which is suitable for analyzing dissolved organic matter in wastewater treatment plants' process water with the high resolution mass spectrometer was clarified. Using this method, dissolved organic matter in the samples from wastewater treatment plants was analyzed, and the removal rates of individual organic matter in multiple treatment process could be roughly estimated. It became clear that even if the overall organic matter removal rates evaluated by BOD and DOC were equivalent among several wastewater treatment processes, the removal rates differed greatly among treatment processes when individual organic matter was analyzed.

Free Research Field

下水処理

Academic Significance and Societal Importance of the Research Achievements

下水処理方式が異なる場合、BODやDOCで評価した有機物の除去率が同等であっても、個別の溶存有機物を見るとその除去特性は様々であることが示された。より高度な下水処理とより安全な水道水供給を実現するためには、有機物全体の指標だけでなく、個別の溶存有機物を網羅的に監視していくことが重要であり、そのためには本研究で示した固相抽出法および精密質量分析計による分析手法が有効であることが示された。