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| Comparison of UV/NaClO and UV/Sodium percarbonate processes for degradation of salicylic acid |
| MA Xiao-yan1, YANG Fan1, LI Qing-song2,3, YANG Qing-yun1, CHEN Guo-yuan2, LI Guo-xin2 |
1. College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
2. Water Resource and Environment Institute, Xiamen University of Technology, Xiamen 361024, China;
3. Key Laboratory of Water Resources Utilization and Protection of Xiamen, Xiamen University of Technology, Xiamen 361024, China |
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Abstract The degradation of salicylic acid (SA) in aqueous solution by UV/NaClO and UV/SPC processes was investigated. The effects of oxidizer types and dosage on SA removal were compared. The free radicals in the two processes were identified by quenching method and electron paramagnetic resonance(EPR) spectroscopy. The second-order rate constants of •OH and CO3•- with SA and the contributions of different components in the reaction system were determined by competitive kinetics. The removal of SA was compared in terms of environmental water samples simulation, acute toxicity and economic benefit. The pseudo-first-order kinetic rate constants of UV/NaClO and UV/SPC processes were 0.4378 and 0.3794min-1, respectively. •OH and Cl• were detected in UV/NaClO process, while O2•-, •OH and CO3•- were detected in UV/SPC process. The second-order rate constants of •OH and CO3•- with SA were calculated to be 3.97x109 and 8x107L/(mol×s), respectively. Reactive chlorine species (RCS) (79.91%) functioned a dominant role in the removal of SA in UV/NaClO process, while O2•-(51.75%) and •OH (41.42%) functioned a dominant role in UV/SPC process. The degradation of SA in environmental water samples by UV/NaClO and UV/SPC processes was inhibited, and the removal rates were reduced by 67% and 74%, respectively. The inhibition rate of UV/SPC process (25%) was 38% lower than that of UV/NaClO process(63%). The cost of UV/SPC process[37.1$/(m3×order)] was 9.3 times higher than that of UV/NaClO process[4.0$/(m3×order)] when SA degradation rate was above 97.5%. UV/NaClO process had higher economic benefit than UV/SPC process.
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Received: 18 August 2021
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