标题: UV/peroxysulfate/ozone (UV/PS/O<sub>3</sub>) oxidation system for efficient degradation of organic matters in nanofilter membrane concentrates
作者: Li, XY (Li, Xinyi); Li, Y (Li, Yan); Wang, Z (Wang, Zhuo); Xu, T (Xu, Tao); Hong, MQ (Hong, Minqiang); Zhao, XB (Zhao, Xiaobin); Mao, XH (Mao, Xuhui)
来源出版物: JOURNAL OF WATER PROCESS ENGINEERING 卷: 65 文献号: 105806 DOI: 10.1016/j.jwpe.2024.105806 Early Access Date: JUL 2024 Published Date: 2024 AUG
摘要: The dissolved organic matters in the membrane concentrates often cause scaling/blockage problems and significantly deteriorate the quality of the recovered salts when the evaporation crystallization process is used to treat membrane concentrates. It is important to find a cost-effective method to decrease the dissolved organic matters in concentrates. This study explores the feasibility of using an ultraviolet/peroxysulfate/ozone (UV/PS/ O3) process for the degradation of organic matters in nanofiltration membrane concentrates (NMCs). The UV/PS/ O3 process outperformed other processes, including UV photolysis alone, PS oxidation alone, UV/PS, and UV/O3, and achieved a complete oxidative degradation of 200 mg/L quinoline (QL) within 40 min in concentrated Na2SO4 solutions. The experiments also revealed that center dot OH and SO4 center dot- were the primary reactive radicals for QL oxidation in the UV/PS/O3 process. QL removal efficiency increased along with the amount of aerated O3, the PS dosage, and was especially enhanced under a weakly alkaline condition. The response surface analysis showed that the optimal condition for QL removal was 4.68 mM PS, 3.43 mg/L O3 gas, and pHini 8.43. The presence of chloride ions (5-15 mM) inhibited the removal of QL. When the combination of UV/PS/O3 process and evaporation crystallization was examined for the treatment of real NMC from a coking plant, it was found that the heating process could thermally activate the residual PS for the removal of organic impurity, and the whole process allowed to recycle sulfate salts with better brightness from the NMC. This study provides a prospective technology for the efficient treatment of NMC wastewater.
作者关键词: Advanced oxidation process; UV; Peroxysulfate; Ozone; Nanofiltration membrane concentrates
地址: [Li, Xinyi; Li, Yan; Xu, Tao; Hong, Minqiang; Mao, Xuhui] Wuhan Univ, Sch Resource & Environm Sci, Dept Environm Sci & Engn, Hubei Key Lab Biomass Resource Chem & Environm Bio, Wuhan 430079, Peoples R China.
[Wang, Zhuo; Zhao, Xiaobin] Wuhan Green Ring Source Purificat Engn Co Ltd, Wuhan 430070, Peoples R China.
通讯作者地址: Li, Y; Mao, XH (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Dept Environm Sci & Engn, Hubei Key Lab Biomass Resource Chem & Environm Bio, Wuhan 430079, Peoples R China.
电子邮件地址: liyan1223@whu.edu.cn; clab@whu.edu.cn
影响因子：9.7
