絮凝-电化学氧化协同工艺处理兰炭废水

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摘要采用絮凝-电化学氧化协同工艺处理兰炭废水,探究了反应过程中絮凝剂投加量、反应时间、初始pH值、外加电压以及NaCl添加量对化学需氧量(COD)和氨氮(NH₃-N)去除的影响及絮凝-电化学氧化协同作用机制.结果表明,随着絮凝剂聚合氯化铝铁(PAFC)投加量和外加电压的增加,兰炭废水中COD和NH₃-N的去除率逐渐升高.当PAFC投加量为50g/L、电压6V、反应时间4h,初始pH=9,NaCl添加量30g/L时,COD和NH₃-N去除率分别为82.37%和100%,更换极板进行二次电解COD去除率可达100%.兰炭废水中有机污染物主要是苯酚类、醇类和酰胺类物质,处理后酚类物质含量大幅减少,酮类、醇类和酸类物质相对占比有所增加.絮凝-电化学氧化过程中,PAFC既是絮凝剂又是Cl^-的提供者,其水解产生的Cl^-与NaCl引入的Cl^-在电场作用下向阳极定向迁移.阳极表面发生氧化反应产生的有效氯(Cl₂/ClO^-)将兰炭废水中有机污染物氧化成中间产物氯酚,与絮凝剂中Al³⁺的水解产物Al(OH)²⁺、Al(OH)₂⁺及Al(OH)₃通过静电和吸附作用结合形成絮凝体被去除.废水中剩余少量的氯酚及酰胺、环己二醇等有机污染物及NH₃-N则在ClO^-的间接氧化作用下转化为N₂、CO₂和H₂O得以去除.

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	王亚
	宋永辉
	李金城
	尹宁
	董萍
	王一帆
	龙江
	李弯弯

关键词 ：兰炭废水, 絮凝, 电解, 电化学氧化, 协同作用, 聚合氯化铝铁(PAFC)

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)

收稿日期: 2023-09-13

PACS:

X703.1

基金资助:陕西省自然科学联合基金项目(2019JLM-44)

通讯作者: 宋永辉,教授,syh1231@126.com E-mail: syh1231@126.com

引用本文:

王亚, 宋永辉, 李金城, 尹宁, 董萍, 王一帆, 龙江, 李弯弯. 絮凝-电化学氧化协同工艺处理兰炭废水[J]. 中国环境科学, 2024, 44(4): 2063-2072. WANG Ya, SONG Yong-hui, LI Jin-cheng, YIN Ning, DONG Ping, WANG Yi-fang, LONG Jiang, LI Wan-wan. Treatment of semi-coking wastewater by synergistic process of flocculation-electrolytic oxidation. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(4): 2063-2072.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I4/2063

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