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Treatment of coking wastewater by a novel electric assisted micro-electrolysis filter

Journal of Environmental Sciences 2018年第4期30卷 165-172页

作者： Ruosong Xie Miaomiao Wu Guangfei Qu Ping Ning Yingying Cai Pei Lv Faculty of Environmental Science and Engineering Kunming University of Science & Technology Kunming 650500 China

A newly designed electric assisted micro-electrolysis filter（E-ME） was developed to investigate its degradation efficiency for coking wastewater and correlated characteristics. The performance of the E-ME system was compared with separate electrolysis（SE） and micro-electrolysis（ME） systems. The results showed a prominent synergistic effect on cod removal in E-ME systems. Gas chromatography/mass spectrometry（GC–MS） analysis confirmed that the applied electric field enhanced the degradation of phenolic compounds.Meanwhile, more biodegradable oxygen-bearing compounds were detected. SEM images of granular activated carbon（GAC） showed that inactivation and blocking were inhibited during the E-ME process. The effects of applied voltage and initial p H in E-ME systems were also studied. The best voltage value was 1 V, but synergistic effects existed even with lower applied voltage. E-ME systems exhibited some p H buffering capacity and attained the best efficiency in neutral media, which means that there is no need to adjust p H prior to or during the treatment process. Therefore, E-ME systems were confirmed as a promising technology for treatment of coking wastewater and other refractory wastewater.

关键词： Coking wastewater Micro-electrolysis Electrochemical COD removal

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