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| Study on the characteristics of 2, 4-dichlorophenol in water degraded by UV/PS |
| CHEN Ju-xiang1,2, GAO Nai-yun2, YANG Jing1, WANG Chao-hui3, GU Zhen-chuan2, Jiang Chuang2 |
1. College of Architecture and Civil Engineering, Xinjiang University, Urumqi 30047, China;
2. State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;
3. School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, China |
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Abstract The study compared the removal effects and the first order reaction kinetics constants of 2, 4-DCP with PS、UV and UV/PS processes, respectively. Investigated the contribution rate of OH· and SO4·- in the photolysis reaction, calculated the two order kinetics constants for SO4·- with 2, 4-DCP reactions. Meanwhile, the degradation rates in actual water conditions were tested and the economic budge of UV and UV/PS processes were calculated and compared. The results showed that the removal rate of 2, 4-DCP was only 4% in the PS process alone, 46.2% in UV process. The degradation percentage can reach as high as 96.4% with UV/PS process, which effectively improved the degradation effect of 2, 4-DCP, meanwhile 2, 4-DCP degradation by PS, UV and UV/PS fitted the pseudo-first-order reaction equation and the kobs (reaction rate constant) was 0.4×10-3, 6.2×10-3 and 35.1×10-3min-1, respectly. The main contribution function of the photolysis reaction was SO4·-, the second-order-reaction constants for SO4·- with 2, 4-DCP was 7.07×109(mol/L)-1s-1. The photo-degradation rates of 2, 4-DCP in three actual water conditions (Xidong water works, Xijiu reservoir, Hengshan reservoir) were higher than in the ultrapure water. The energy utilization rate of UV/PS cooperative system is the highest during economic calculation.
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Received: 17 October 2016
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