Advanced Activated Sludge Process

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K21024
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 22:Civil engineering and related fields
• Research Institution: Waseda University
• Principal Investigator: Sakakibara Yutaka 早稲田大学, 理工学術院, 教授 (80143204)
• Project Period (FY): 2020-07-30 – 2024-03-31
• Keywords: 促進活性汚泥法 / バイオフェントン反応 / マグネタイト / 過酸化水素 / 嫌気好気処理 / OHラジカル / SBR

Outline of Final Research Achievements

Anaerobic and aerobic activated sludge process with magnetite particles was proposed and the treatment performances were investigated using SBR and continuous reactors. Experimental results demonstrated that simultaneous removals of COD, TN, TP and antibiotics were achieved by the process. Moreover, the oxidation and reduction cycle of Fe(Ⅱ/Ⅲ) of magnetite was established under anaerobic and aerobic conditions. Hydrogen peroxide (H2O2) was biologically produced and converted to OH radicals in aerobic conditions by biological Fenton reaction. In the same manner as the conventional anaerobic and aerobic process, nitrification and denitrification as well as phosphorous release and uptake reactions proceeded. Removal efficiencies of antibiotics increased with increasing amounts of magnetite and attained 100 % at an optimal conditon.

Free Research Field

水環境工学

Academic Significance and Societal Importance of the Research Achievements

薬剤耐性は地球規模の環境問題として顕在化している。都市下水中にはその原因物質である抗生物質や耐性菌が存在するが、現行の下排水処理法では充分に除去できず、多くが環境中に放出されている。本研究により、従来の水質項目に加えて、抗生物質を高効率で除去できることが示された。本法の適用・普及により、水環境中の抗生物質濃度や耐性菌等の出現頻度が減少すると考えられる。すなわち、本研究成果は新興汚染物質の無害化・環境放出量の減少、耐性菌による感染症死亡率の減少、水再生利用の推進などに貢献すると考えられる。