2022 Fiscal Year Annual Research Report
Complete elimination with a combined system of aerobic granular sludge and photocatalytic technology for the treatment of petroleum refinery wastewater
| Project/Area Number |
21J10826
|
|---|
| Research Institution | University of Tsukuba |
|---|
Principal Investigator |
MING Jie 筑波大学, 生命環境科学研究科, 特別研究員(DC2)
|
|---|
| Project Period (FY) |
2021-04-28 – 2023-03-31
|
| Keywords | Water purification / Photocatalysis / Z-scheme / High-efficiency / Public health |
|---|
| Outline of Annual Research Achievements |
In this fiscal year, the study was carried out through the following key points: (1) Develop Z-scheme g-C3N4-Ag/Ag2O/BiPO4/Bi2WO6 (CN-Ag/P/BWO) for water purification; (2) Investigate the disinfection activity for Enterococcus sp.; (3) Clarify the disinfection mechanism for Enterococcus sp.; (4) Evaluate the practicability to environmental water disinfection; (5) Reveal the cyclic ability of CN-Ag/P/BWO immobilized system; (6) Explore the degradation activity of CN-Ag/P/BWO for organics (phenol/tetracycline). The results showed that Z-scheme CN-Ag/P/BWO was successfully constructed with remarkable disinfection performance for Enterococcus sp.. The disinfection mechanism demonstrated the major roles of photogenerated holes, superoxide radicals and hydroxyl radicals. The deteriorated antioxidant system was responsible for the damaged cell membrane and energy system, further leading to the leakage of intracellular components and final collapse of bacteria. CN-Ag/P/BWO exhibited high practicability to environmental water disinfection. Besides, the immobilized CN-Ag/P/BWO system showed high activity for Enterococcus sp. disinfection during five cycles. Although, CN-Ag/P/BWO exhibited poor performance for phenol degradation due to its stable π-conjugated structure, 97% of tetracycline was removed after 60-min treatment, indicating its high photocatalytic activity and prospect for antibiotics degradation. Therefore, this work provides a high-efficiency technology for water purification, contributing to the improvement of public health and environment.
|
| Research Progress Status |
令和4年度が最終年度であるため、記入しない。
|
| Strategy for Future Research Activity |
令和4年度が最終年度であるため、記入しない。
|
