废水
反硝化
化学
污水处理
铵
氮气
污染物
环境化学
电化学
氨
硝酸盐
制浆造纸工业
废物管理
环境科学
环境工程
电极
有机化学
物理化学
工程类
作者
Zhenyu Wu,Wenjie Zhu,Yang Liu,Pai Peng,Xiuyan Li,Xiaoqi Zhou,Juan Xu
出处
期刊:Chemosphere
[Elsevier]
日期:2020-05-01
卷期号:246: 125703-125703
被引量:33
标识
DOI:10.1016/j.chemosphere.2019.125703
摘要
Coking wastewater is highly toxic and refractory industrial wastewater, and is thus extremely challenging to treat. Currently, most treatment technologies focus on degrading carbonaceous pollutants, while insufficient attention is placed on ammonium nitrogen (NH4+-N), the most important nitrogenous contaminant in coking wastewater and with a high biological toxicity. In the current study, we developed an integrated electrochemical system comprising two three-dimensional electrochemical reactors (3DERs), two three-dimensional biofilm electrode reactors (3DBERs) and one three-dimensional biofilm electrode reactor for denitrification (3DBER-De) to treat coking wastewater rich in NH4+-N. Our integrated system is able to remove 70.7% of total nitrogen (TN) at the low energy consumption of 1.29 kWh m-3, and can reduce COD by 55.8%. The 3DERs primarily degrade NH4+-N, nitrate nitrogen (NO3--N), and COD by electrochemical redox reactions, while the 3DBERs convert residual NH4+-N to NO3--N by fusing biofilm and electricity. Moreover, the 3DBER-De further eliminates NO3--N by bio-electrochemical denitrification. The coking wastewater is purified as it flows through the integrated treatment system, with only a few hydrocarbon residuals detected that are able to be readily biodegraded by conventional biological treatments. The proposed 3DERs/3DBERs/3DBER-De system provides a new solution for coking wastewater with high concentrations of NH4+-N.
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