电化学氧化法去除兰炭废水中COD和NH<sub>3</sub>-N

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Abstract Electro-chlorination and oxidation method was applied to treat the high concentration harmful components in blue-coke wastewater. The influence of dosage of sodium chloride bearing, external voltage, and initial pH on removal efficiency of chemical oxygen demand (COD) and ammonia nitrogen (NH₃-N) were investigated, the processing and pollutant oxidation mechanism of electrochemical oxidation were systematical analyzed. The results indicated that the removal efficiency of COD and NH₃-N both increased with the increasing of the addition of dosage of sodium chloride, applied voltage, and electrolysis time. Under the processing condition of sodium chloride 60g/L, voltage 6V, electrode distance 10mm, initial pH 9, and 3h electrolysis time, the COD and NH₃-N removal efficiency reached 84.31% and 95.77% respectively, which extremely exceeded the removal efficiency 41.18% and 34.10% without NaCl as the electrolyte. The degradation of COD and NH₃-N mainly depended on indirect oxidation of anode, the chlorine gas produced on the anode would occur hydrolysis reaction to produce active chlorine such as ClO^- in the solution. During electrolysis, most of ammonia nitrogen were converted to N₂at the action of ClO^-, and a small part existed in form of the compounds of containing nitrogen in the bulk solution. The major organic pollutants, phenolic substances in blue-coke wastewater decreased greatly after treatment, part of them could be converted into ethers or alkanes.

Key words： electrochemical oxidation blue-coke wastewater chemical oxygen demand (COD) ammonia nitrogen (NH₃-N)

Received: 18 May 2021

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X703

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	LI Jin-cheng
	SONG Yong-hui
	TANG Jie-li

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LI Jin-cheng,SONG Yong-hui,TANG Jie-li. Removing of COD and NH₃-N from blue-coke wastewater by electrochemical oxidation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(2): 697-705.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I2/697

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