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A novel electro-catalytic membrane contactor for improving the efficiency of ozone on wastewater treatment
Li, Kuiling; Xu, Lili; Zhang, Yong; Cao, Aixin; Wang, Yujue; Huang, Haiou; Wang, Jun
2019-07-15
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL
ISSN0926-3373
Volume249Pages:316-321
AbstractA novel electro-catalytic membrane contactor was designed to break the two constrains in O-3 wastewater treatment technology simultaneously: the mass transfer of O-3-water and the decomposition rate of O-3 into (OH)-O-center dot. In the electro-catalytic membrane contact ozonation (ECMCO) process, O-2 and O-3, in the gas chamber, diffuse through the hydrophobic membrane into the water phase; O-2 is electro-reduced to H2O2 that catalyzes O-3 producing (OH)-O-center dot to degrade organic compounds rapidly. The removal rate of nitrobenzene (NB) was significantly improved by the combination of membrane contactor and electro-catalytic process. The removal rates of NB in 120 min were 85%, 55% and 23% for ECMCO, membrane contact ozonation and electrolysis, respectively. O-3 concentration and current density had positive effects on the removal of NB, which was related to the accumulated H2O2 concentration in aqueous phase. Gas flow had slight positive effects on NB removal when it was lower than 50 mL/min. The pH of the feed may affect the production and the form of H2O2 and hence the removal of NB. The highest removal rate in 120 min was up to 95.7% at the initial pH of 4.5. Mass transfer and electrolysis are synthetic in ECMCO process. On one hand, the mass transfer of O-3 increased by 2 times due to the electro-catalytic production of H2O2. On the other hand, the existence of O-3 promoted the production of H2O2. ECMCO has great potential on promoting mass transfer and decomposition of O-3 into (OH)-O-center dot for the industrial application of O-3.
Department环境水质学国家重点实验室
KeywordMass transfer Advanced oxidation process Hydrophobic membrane Membrane contactor
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/42617
Collection环境水质学国家重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, 18 Shuangqing Rd, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, 19 Yuquan Rd, Beijing 100049, Peoples R China
3.Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China
Recommended Citation
GB/T 7714
Li, Kuiling,Xu, Lili,Zhang, Yong,et al. A novel electro-catalytic membrane contactor for improving the efficiency of ozone on wastewater treatment[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2019,249:316-321.
APA Li, Kuiling.,Xu, Lili.,Zhang, Yong.,Cao, Aixin.,Wang, Yujue.,...&Wang, Jun.(2019).A novel electro-catalytic membrane contactor for improving the efficiency of ozone on wastewater treatment.APPLIED CATALYSIS B-ENVIRONMENTAL,249,316-321.
MLA Li, Kuiling,et al."A novel electro-catalytic membrane contactor for improving the efficiency of ozone on wastewater treatment".APPLIED CATALYSIS B-ENVIRONMENTAL 249(2019):316-321.
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