Advanced treatment of bio-treated coking wastewater by coupling of ferrous-activated persulfate oxidation and activated carbon adsorption
LIU Mei-qin, SONG Xiu-lan
Shanxi Engineer Research Center of Sludge Treatment and Resource Recycle, Department of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
The paper focuses on advanced oxidation process of Fe2+ activated persulfate (PS) coupled with activated carbon adsorption which was originally applied to treat bio-treated coking wastewater. The effects of PS dose, Fe2+ dose and initial pH in Fe2+/PS system on the treatment efficiency of bio-treated coking wastewater were investigated at the TOC concentration of 86.4mg/L and chroma of 338times in raw wastewaters. The results indicated that the removal rates of chroma and TOC were 87.17% and 68.16%, respectively, under the condition of 1.5mmol/L PS, 4mmol/L Fe2+, not adjusted pH value (pH=8) when reaction time was 60minutes. The advanced adsorption treatment on effluent of Fe2+/PS system was also carried out by two kinds of granular activated carbon A and B. The results showed that the activated carbon B had remarkable better adsorption performance, which could further eliminate residual persulfate by Fe2+/PS system. When the dose of activated carbon B was 15g/L, and reaction time was 120minutes, the effluent chroma and TOC concentration reached 14times and 11.86mg/L, respectively. After the treatment of Fe2+ activated persulfate oxidation coupled with activated carbon adsorption on biological treated coking wastewater, the total removal rates of chroma and TOC reached 95.86% and 86.27%, respectively. The results of three dimensional fluorescence spectra analysis for bio-treated coking wastewater, Fe2+/PS system effluent, and activated carbon adsorption effluent showed that Fe2+/PS system can decompose humic acid-like compounds in wastewater, and activated carbon adsorption may further remove residual humic acid-like compounds in wastewater.
刘美琴, 宋秀兰. Fe2+激活过硫酸盐耦合活性炭深度处理焦化废水[J]. 中国环境科学, 2018, 38(4): 1377-1384.
LIU Mei-qin, SONG Xiu-lan. Advanced treatment of bio-treated coking wastewater by coupling of ferrous-activated persulfate oxidation and activated carbon adsorption. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(4): 1377-1384.
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