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In-situ ion exchange electrocatalysis biological coupling (i-IEEBC) for simultaneously enhanced degradation of organic pollutants and heavy metals in electroplating wastewater

[Display omitted] •The i-IEEBC were applied to treat electroplating wastewater.•CD of 0.40 mA/(cm)2 exhibited the highest COD, TOC, Cr and Cu removal rates.•The biodegradability increases after operation under the optimal CD.•Cation exchange properties improve the catalytic lifetime of the particle...

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Bibliographic Details
Published in:Journal of hazardous materials 2019-02, Vol.364, p.562-570
Main Authors: Feng, Yan, Yang, Shumin, Xia, Liu, Wang, Zhongwei, Suo, Ning, Chen, Hao, Long, Yingying, Zhou, Bo, Yu, Yanzhen
Format: Article
Language:English
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Summary:[Display omitted] •The i-IEEBC were applied to treat electroplating wastewater.•CD of 0.40 mA/(cm)2 exhibited the highest COD, TOC, Cr and Cu removal rates.•The biodegradability increases after operation under the optimal CD.•Cation exchange properties improve the catalytic lifetime of the particle electrodes.•The i-IEEBC is a high efficient alternative technology to electroplating wastewater. The goal of this research was to develop a new process for simultaneously removing organics and heavy metals of electroplating wastewater by in-situ ion exchange electrocatalysis biological coupling (i-IEEBC). The study evaluated the removal efficiency of coexisting refractory organics and heavy metal ions, and investigated the effects of current density (CD) on the removal performance of the i-IEEBC method. The results indicated the i-IEEBC reactor exhibited higher average removal rates of COD, TOC, Cr and Cu ions, i.e. 87.23%, 80.42%, 91.25%, and 95.97% in that order, which represented an increase by 32.59%, 40.10%, 31.86%, and 33.82%, respectively, compared with BAF. The optimum CD for simultaneously removing organics and heavy metals of electroplating wastewater in i-IEEBC was 0.40 mA/(cm)2. The change of biodegradability and the presence of short chain organic compounds also indirectly confirmed the excellent removal organic pollutants performance of i-IEEBC at the optimum CD. In addition, the composition and construction of CER before and after the application, under the optimum CD, SEM, EDS and FT-IR spectroscopy also showed that the cation exchange properties of CER improved the catalytic lifetime of the particle electrodes. This research provides a highly efficient new alternative to electroplating wastewater treatment technology.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2018.10.068