Combined ozone oxidation and biological aerated filter processes for treatment of cyanide containing electroplating wastewater
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- 作者：Jiaqi Cui ; Xiaojun Wang ; Yanlei Yuan ; Xunwen Guo ; Xiaoyang Gu ; Lei Jian
- 关键词：Cyanide ; Electroplating wastewater ; Ozone ; Biological aerated filter (BAF) ; Biodegradation treatment
- 刊名：Chemical Engineering Journal
- 出版年：1 April, 2014
- 年：2014
- 卷：241
- 期：Complete
- 页码：184-189
- 全文大小：620 K
文摘
In this study, combined ozone oxidation and biological aerated filter (BAF) processes treating cyanide containing electroplating wastewater was investigated. The combined process of first BAF-ozone-second BAF (BAF1-O<sub>3sub>-BAF2) was proved the optimal combined way. Under the optimal condition of 100 mg/L ozone dosage, BAF1 HRT (hydraulic retention time) 9 h and BAF2 HRT 6 h, the CN<sup>鈭?/sup>, COD (chemical oxygen demand), Cu<sup>2+sup> and Ni<sup>2+sup> removal efficiencies were 99.7%, 81.7%, 97.8% and 95.3%, respectively and the effluent CN<sup>鈭?/sup>, COD, Cu<sup>2+sup> and Ni<sup>2+sup> concentrations of 0.16 mg/L, 55.0 mg/L, 0.38 mg/L and 0.41 mg/L, respectively satisfied the discharge standard for electroplating (China). The results show that BAF1 can tolerate higher cyanide toxicity than some other bioreactors. Furthermore, the addition of glucose into raw electroplating wastewater (EPWW) could increase contaminants removal efficiencies of BAF1. Cyanide compounds of EPWW could be used as the nitrogen source for the microorganisms.