絮凝-电化学氧化协同工艺处理兰炭废水

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Abstract The synergistic process of flocculation-electrochemical oxidation was used to treat the semi-coking wastewater. The effects of flocculant dosage, reaction time, initial pH, applied voltage, and NaCl addition on the removal of chemical oxygen demand (COD) and ammonia nitrogen (NH₃-N) and the synergistic mechanism of flocculation-electrochemical oxidation were investigated. The results indicated that the removal rate of COD and NH₃-N in the semi-coking wastewater gradually increased with the increase of polyaluminium ferric chloride (PAFC) dosage and applied voltage. Under optimal conditions of 50g/L PAFC dosage, 6V voltage, 4h reaction time, initial pH of 9, and 30g/L NaCl addition, the removal rates for COD and NH₃-N were 82.37% and 100%, respectively. By replacing the electrode plate for the secondary electrolysis, the COD removal rate could reach 100%. The organic pollutants in the semi-coking wastewater before treatment were mainly phenols, alcohols and amides. After treatment, the content of phenols decreased significantly, and the relative proportion of ketones, alcohols and acids increased. During the flocculation- electrochemical oxidation process, PAFC functioned both as a flocculant and provider of Cl^-. The Cl^- dissociated from PAFC hydrolysis, together with Cl^- introduced by NaCl, migrated directionally towards the anode under an electric field. The active chlorine (Cl₂/ClO^-) generated by the oxidation reaction on the anode surface oxidized the organic pollutants in the semi-coking wastewater into intermediate products, chlorophenols, which combined with the hydrolysis products of Al³⁺ from the flocculant, Al(OH)²⁺, Al(OH)₂⁺, and Al(OH)₃, through electrostatic and adsorptive interactions to form flocs that were removed. The remaining traces of organic pollutants such as chlorophenols, amides, cyclohexanediol, and NH₃-N in the wastewater were converted into N₂, CO₂, and H₂O by the indirect oxidation action of ClO^-.

Key words： semi-coking wastewater flocculation electrolysis electrochemical oxidation synergistic polyaluminium ferric chloride (PAFC)

Received: 13 September 2023

PACS:

X703.1

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	Articles by authors
	WANG Ya
	SONG Yong-hui
	LI Jin-cheng
	YIN Ning
	DONG Ping
	WANG Yi-fang
	LONG Jiang
	LI Wan-wan

Cite this article:

WANG Ya,SONG Yong-hui,LI Jin-cheng等. Treatment of semi-coking wastewater by synergistic process of flocculation-electrolytic oxidation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(4): 2063-2072.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I4/2063

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