Process optimization and degradation mechanism of organic matter in Fenton oxidation treatment of coking wastewater

RAN Yu-fang; XU Chun; LI Xin-peng; GONG Yao; FENG Wei-bo; HU Jia-shuo; ZHAO Cheng-wang

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China Environmental Science ›› 2023, Vol. 43 ›› Issue (12) : 6329-6340.

Water Pollution Control

Process optimization and degradation mechanism of organic matter in Fenton oxidation treatment of coking wastewater

RAN Yu-fang¹, XU Chun¹, LI Xin-peng¹, GONG Yao¹, FENG Wei-bo², HU Jia-shuo², ZHAO Cheng-wang²

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Abstract

In this study, Fenton reaction was used to oxidize pollutants in coking wastewater, and the degradation effects of time, pH, H₂O₂/COD mass ratio and Fe²⁺/H₂O₂ molar ratio on coking wastewater were investigated. The response surface method (RSM) was used to optimize parameters, and the change rule of organic compounds in the reaction was explored. The results show that Fenton oxidation has a good treatment effect on coking wastewater. Under the conditions of pH=3.19, m(H₂O₂/COD) 1.72, n(Fe²⁺/H₂O₂) 0.74 and reaction time 40min, the COD removal rate was 72.69%. The B/C ratio of treated wastewater increased from 0.24 to 0.32. According to the analysis of organic matter in coking wastewater before and after the reaction, there were 21 kinds of organic matter in raw water, most of which were macromolecular substances with complex types, while the number of organic matter in Fenton effluent was significantly reduced to 14. Among them, nitrogen-containing organic matter was completely degraded, some aromatic compounds in the benzene ring cracked, most of the long chain organic matter was broken into short chain organic matter, and the overall molecular weight decreased.

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coking wastewater / fenton oxidation / mechanism / organics analysis / response surface method

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RAN Yu-fang, XU Chun, LI Xin-peng, GONG Yao, FENG Wei-bo, HU Jia-shuo, ZHAO Cheng-wang. Process optimization and degradation mechanism of organic matter in Fenton oxidation treatment of coking wastewater[J]. China Environmental Science. 2023, 43(12): 6329-6340

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