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Discovering the Importance of ClO• in a Coupled Electrochemical System for the Simultaneous Removal of Carbon and Nitrogen from Secondary Coking Wastewater Effluent.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-05-27 , DOI: 10.1021/acs.est.9b07704 Wenxiao Zheng 1 , Liuyi Zhu 1 , Sheng Liang 1 , Jinshao Ye 2 , Xin Yang 3 , Zhenchao Lei 1 , Zhang Yan 1 , Yongdong Li 1 , Chaohai Wei 1 , Chunhua Feng 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-05-27 , DOI: 10.1021/acs.est.9b07704 Wenxiao Zheng 1 , Liuyi Zhu 1 , Sheng Liang 1 , Jinshao Ye 2 , Xin Yang 3 , Zhenchao Lei 1 , Zhang Yan 1 , Yongdong Li 1 , Chaohai Wei 1 , Chunhua Feng 1
Affiliation
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Inorganic constituents in real wastewater, such as halides and carbonates/bicarbonates, may have negative effects on the performance of electrochemical systems because of their capability of quenching HO•. However, we discovered that the presence of Cl– and HCO3– in an electrochemical system is conducive to the formation of ClO•, which plays an important role in promoting the simultaneous elimination of biorefractory organics and nitrogen in secondary coking wastewater effluent. The 6-h operation of the coupled electrochemical system (an undivided electrolytic cell with a PbO2/Ti anode and a Cu/Zn cathode) at a current density of 37.5 mA cm–2 allowed the removal of 87.8% of chemical oxygen demand (COD) and 86.5% of total nitrogen. The electron paramagnetic resonance results suggested the formation of ClO• in the system, and the probe experiments confirmed the predominance of ClO•, whose steady-state concentrations (8.08 × 10–13 M) were 16.4, 26.5, and 1609.5 times those of Cl2•– (4.92 × 10–14 M), HO• (3.05 × 10–14 M), and Cl• (5.02 × 10–16 M), respectively. The rate constant of COD removal and the Faradaic efficiency of anodic oxidation obtained with Cl– and HCO3– was linearly proportional to the natural logarithm of the ClO• concentration, and the specific energy consumption was inversely correlated to it, demonstrating the crucial role of ClO• in pollutant removal.
中文翻译：
发现ClO•在耦合电化学系统中同时去除焦化二次废水中的碳和氮的重要性。
实际废水中的无机成分（例如卤化物和碳酸盐/碳酸氢盐）可能会因其淬灭HO •的能力而对电化学系统的性能产生负面影响。然而，我们发现，氯的存在-和HCO 3 -电化学系统，有利于形成CLO的•，这对促进难生化有机物的同时消除和氮在二次焦化废水排放具有重要作用。耦合电化学系统（具有PbO 2 / Ti阳极和Cu / Zn阴极的不分隔电解池）在37.5 mA cm –2的电流密度下运行6小时允许去除87.8％的化学需氧量（COD）和总氮的86.5％。电子顺磁共振结果表明系统中形成了ClO •，探针实验证实了ClO •的优势，其稳态浓度（8.08×10 –13 M）是ClO •的16.4、26.5和1609.5倍2 •–（4.92×10 –14 M），HO •（3.05×10 –14 M）和Cl •（5.02×10 –16 M）。COD去除率和有Cl得到的阳极氧化的法拉第效率的速率常数-和HCO 3 -它与ClO •浓度的自然对数成线性比例，单位能耗与它成反比，证明了ClO •在污染物去除中的关键作用。
更新日期：2020-07-21
中文翻译：
发现ClO•在耦合电化学系统中同时去除焦化二次废水中的碳和氮的重要性。
实际废水中的无机成分（例如卤化物和碳酸盐/碳酸氢盐）可能会因其淬灭HO •的能力而对电化学系统的性能产生负面影响。然而，我们发现，氯的存在-和HCO 3 -电化学系统，有利于形成CLO的•，这对促进难生化有机物的同时消除和氮在二次焦化废水排放具有重要作用。耦合电化学系统（具有PbO 2 / Ti阳极和Cu / Zn阴极的不分隔电解池）在37.5 mA cm –2的电流密度下运行6小时允许去除87.8％的化学需氧量（COD）和总氮的86.5％。电子顺磁共振结果表明系统中形成了ClO •，探针实验证实了ClO •的优势，其稳态浓度（8.08×10 –13 M）是ClO •的16.4、26.5和1609.5倍2 •–（4.92×10 –14 M），HO •（3.05×10 –14 M）和Cl •（5.02×10 –16 M）。COD去除率和有Cl得到的阳极氧化的法拉第效率的速率常数-和HCO 3 -它与ClO •浓度的自然对数成线性比例，单位能耗与它成反比，证明了ClO •在污染物去除中的关键作用。
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