Removal of β-cyclocitral by UV/persulfate and UV/chlorine process: Degradation kinetics and DBPs formation

被引：0
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作者：
Xiang, Huiming [1 ]
Shao, Yisheng [1 ]
Gao, Naiyun [1 ]
Lu, Xian [2 ]
An, Na [1 ]
Chu, Wenhai [1 ]
机构：
[1] State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, China
[2] College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai,201306, China
来源：
Chemical Engineering Journal | 2021年 / 382卷
关键词：
β-cyclocitral is a taste and odor (T&O) compounds and can cause malodorous problems in drinking water. This study focused on the kinetics and disinfection by-products (DBPs) formation of β-cyclocitral degradation by UV/persulfate (UV/PS) and UV/free chlorine processes. The degradation of β-cyclocitral in the two processes well fitted the first-order kinetic model. The second-order rate constant of β-cyclocitral with SO4·-; OH·; and Cl· were estimated to be (8.6 ± 0.12) × 109 M−1 s−1; (6.89; ±; 0.42); ×; 109; M−1; s−1; and (9.58 ± 0.38) × 109 M−1 s−1 at pH 7.0; respectively. For UV/PS system; SO4·- contributed more than OH· does; while Cl· accounted for most degradation in UV/free chlorine process. The degradation rate increased with the increasing PS and chlorine dosage. For UV/PS process; the degradation rate constant (kobs; β-cyclocitral) was observed to be the highest at pH 7.0. For UV/free chlorine process; kobs; β-cyclocitral was found to be the highest at pH 5.0 and decreased substantially at pH 9.0. Presence of high concentration (5 mM) anions (chloride; bicarbonate) showed inhibition effect on the β-cyclocitral degradation. Dramatic decreasing was observed in the presence of NOM in both UV/PS and UV/free chlorine process. Compared with UV/PS system; UV/free chlorine was more suitable for treating waters containing β-cyclocitral because of the serious inhibition in real water matrix. UV/PS pretreatment reduced the trichlormethane (TCM) yield after post-chlorination; while enhanced the yield of dichloro acetaldehyde (DCAL). UV/free chlorine pretreatment promoted the formation of both TCM and DCAL. The theoretical cytotoxicity UV/PS pretreatment and post-chlorination is observed to be the highest due to the great amount of DCAL generation. Although UV/PS and UV/free chlorine processes can effectively degrade the β-cyclocitral; the selection of two processes should be carefully balanced against the DBPs formation in post-chlorination. © 2019 Elsevier B.V;
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