改性活性炭纤维活化过硫酸盐深度处理焦化废水及降解吡啶

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Abstract In this study, NaOH-modified activated carbon fiber (ACF) was used to activate peroxymonosulfate (PMS) for the advanced treatment of coking wastewater and degradation of pyridine. The effects of NaOH-ACF dosages, PMS concentrations, and initial pH values on chemical oxygen demand (COD), chroma, and pyridine removal efficiency were investigated using batch experiments. Experimental results indicated that NaOH-ACF/PMS system could effectively degrade organics and chroma, and completely degrade pyridine. The characterization analysis showed that NaOH-ACF had many surfaces functional groups and preferable performance of adsorptive and catalytic. The removal efficiency of COD and chroma reached to 85.7% and 93.8% after the treatment of 120min, respectively, under the optimal conditions of 2.0g/L NaOH-ACF, 6.0mmol/L PMS, pH 7.0, and reaction temperature 25℃. Under the same conditions, the degradation efficiency of pyridine reached to 100% with the initial concentration of 10mg/L. Photobacteria acute toxicity tests showed that the detoxification could be achieved under the optimal operation by NaOH-ACF/PMS system. Free radical quenching experiments confirmed the existence of both SO₄^-· and ·OH in the system. GC-MS analysis presented that those complex substances of macromolecules in coking wastewater could be effectively removed and further converted into small-molecule matters in the NaOH-ACF/PMS system. In addition, pyridine could be completely degraded through hydroxylation and dehydrogenation.

Key words： NaOH-modified activated carbon fiber peroxymonosulfate coking wastewater advanced treatment degradation of pyridine reaction mechanism toxicity evaluation

Received: 27 June 2022

PACS:

X703

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	SU Bing-qin
	WEN Yu-tao
	LIN Yu-ting
	PENG Ya-ya
	WANG Peng-ying
	GUO Yue
	LI Rui

Cite this article:

SU Bing-qin,WEN Yu-tao,LIN Yu-ting等. Advanced treatment of coking wastewater and degradation of pyridine using modified activated carbon fiber activating peroxymonosulfate[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(2): 576-591.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I2/576

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