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| Catalytic ozonation of dairy wastewater using Mn-Co-Ce/γ-Al2O3 and its mechanism |
| Received:October 08, 2021 |
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| KeyWord:Mn-Co-Ce/γ-Al2O3 catalyst;catalytic ozonation;dairy wastewater;reactive oxygen specy |
| Author Name | Affiliation | E-mail | | CHEN Shuqi | School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China | | | SONG Weifeng | School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China | weifengsong@gdut.edu.cn | | QIU Tongqiang | Guangzhou Huamei Milk Co., Ltd., Guangzhou 510940, China | | | HUANG Hengxin | Guangzhou Huamei Milk Co., Ltd., Guangzhou 510940, China | | | YANG Zuoyi | School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China | | | QIU Yifan | School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China | | | BAI Xiaoyan | School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China | |
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| Abstract: |
| Certain organic compounds are hardly biodegradable in dairy wastewater, rendering it difficult to treat. In this study, a ternary catalyst（Mn-Co-Ce/γ-Al2O3）was prepared using an impregnation method. By selecting tertiary aerobic dairy wastewater as the treatment object, the effects of roasting temperature, roasting time, catalytic reaction time, pH, ozone dosage, and catalyst dosage on the catalytic oxidation effect were investigated. The results showed that the removal rate of CODCr reached approximately 50% in 30 min under optimal reaction conditions：catalyst dosage of 15 g·L-1, pH=9, and ozone dosage of 12.5 mg·L-1·min-1. The catalysts were characterized via XRD, SEM, BET, and XPS, which showed that the metal oxides were successfully supported on spherical γ-Al2O3 and highly dispersed. A cycle test was performed and showed that the catalyst maintained high activity even after 5 cycles, indicating its good stability. Reactive oxygen quenching revealed that O2-· , HO·, and 1O2 could be generated in the system, while 1O2 plays a dominant role. |
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