Generation and application of reactive chlorine species by electrochemical process combined with UV irradiation: Synergistic mechanism for enhanced degradation performance

化学 废水 电化学 矿化(土壤科学) 降级(电信) 激进的 盐度 环境化学 氮气 无机化学 核化学 电极 环境工程 有机化学 物理化学 工程类 生物 电信 计算机科学 生态学
作者
Yunting Wang,Yudong Xue,Chunhui Zhang
出处
期刊:Science of The Total Environment [Elsevier]
卷期号:712: 136501-136501 被引量:66
标识
DOI:10.1016/j.scitotenv.2020.136501
摘要

Saline wastewater originates from many industries, containing a large amount of salt (NaCl) and other toxic and harmful organic matter, which have a great impact on the soil and groundwater. However, the treatment of saline wastewater is a serious problem because organic contents are hard to degrade with the high salinity by the common water treatment technologies. Herein, an electrochemical process coupled with ultraviolet (UV) irradiation was proposed for the saline wastewater treatment. High efficiency of p-nitrophenol (p-NP) and ammonia degradation were contributed from the in situ electrochemical produced active chlorine and photo-induced chlorine radicals. Under the optimal conditions (0.10 A, 0.05 M NaCl, and pH 6.00), approximately 98.91% p-NP was removed after 60 min with the rate constant of 7.521 × 10−2 min−1 in the electrochemical process, and 28.99% mineralization rate was obtained, while with the synergistic effect of UV and electrochemistry, approximately 100% of p-NP removal (k = 9.331 × 10−2 min−1) was achieved by 30 min treatment and about 83.70% of p-NP can be mineralized to CO2 after 60 min. The study on the synergistic mechanism of enhanced degradation performance illustrated that Cl with high oxidation capacity played an important role in the p-NP oxidation. Besides, based on the chlorine radical reactions, this method was also effectively applied to remove ammonia nitrogen (92.00% removal of total nitrogen in 100 min) for nitrogen-containing wastewater. Thus, this study offers a promising approach for the treatment of saline industry wastewater.
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