Treatment of acrylonitrile quadruple effect evaporation condensate by electrochemical oxidation-electrodialysis united technology

doi:10.19965/j.cnki.iwt.2021-0854

Abstract

Abstract:

Treating acrylonitrile quadruple effect evaporation condensate by electrochemical oxidation-electrodialysis united technology not only solves the problem of high salt content in the effluent of electrochemical oxidation inconvenient for subsequent biochemical treatment，but also decreases the operation cost. The results showed that the effect of three-dimensional electrochemical oxidation was obviously better than that of two-dimensional electrochemical oxidation，and a variety of organic pollutants were greatly removed. The concentration of total nitrogen（TN） and total organic carbon（TOC） in the effluent of three-dimensional electrochemical oxidation were reduced to 125.8 mg/L and 335.2 mg/L，respectively，which were 18.36% and 26.31% lower than the latter，and the operation energy consumption decreased by 14.4%. The desalination rate of the electrochemical oxidation effluent was close to 100% by electrodialysis，and the electrodialysis concentrated water had little effect on the removal rate of pollutants when the concentrated water was reused to electrochemical oxidation. Finally，B/C raised to 0.43，and the biodegradability was greatly improved.

Key words: electrochemical oxidation, electrodialysis, united technology, acrylonitrile quadruple effect evaporation condensate

摘要：

采用“电化学氧化-电渗析”联合处理丙烯腈四效蒸发凝液，既解决了电化学氧化出水盐含量高，不利于后续生化处理的难题，又节约了运行成本。结果表明，三维电化学氧化效果明显优于二维电化学氧化，多种有机污染物被大幅去除，三维电化学氧化出水中总氮（TN）和总有机碳（TOC）质量浓度分别降至125.8、335.2 mg/L，比二维电化学氧化分别降低了18.36%、26.31%，运行能耗也降低了14.4%；采用电渗析处理氧化出水，脱盐率接近100%，且浓水回用对污染物的去除率影响较小，最终出水B/C提升至0.43，可生化性大大提高。

关键词: 电化学氧化, 电渗析, 技术联用, 丙烯腈四效蒸发凝液

CLC Number:

X703.1

Wenhu WANG, Shanshan ZHAO, Wei WANG, Guangxu YAN. Treatment of acrylonitrile quadruple effect evaporation condensate by electrochemical oxidation-electrodialysis united technology[J]. Industrial Water Treatment, 2022, 42(5): 150-156.

王文虎, 赵姗姗, 王伟, 阎光绪. 电化学氧化-电渗析联合处理丙烯腈四效蒸发凝液[J]. 工业水处理, 2022, 42(5): 150-156.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-0854

https://www.iwt.cn/EN/Y2022/V42/I5/150

Figures/Tables 11

References 21

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膜类型	厚度/mm	交换容量/（mmol·g^-1）	含水量/%	膜面电阻/（Ω·cm²）	离子迁移数/%	爆裂强度/MPa
阳离子交换膜	0.16	1.8~2.2	33~40	1.5~2.5	95~99	>3
阴离子交换膜	0.16	1.8~2.0	24~28	3	90~95	>3

膜类型	厚度/mm	交换容量/（mmol·g^-1）	含水量/%	膜面电阻/（Ω·cm²）	离子迁移数/%	爆裂强度/MPa
阳离子交换膜	0.16	1.8~2.2	33~40	1.5~2.5	95~99	>3
阴离子交换膜	0.16	1.8~2.0	24~28	3	90~95	>3

序号	种类	电化学氧化前		电化学氧化后
序号	种类	数目/种	占比/%	数目/种	占比/%
1	有机腈类	32	46.27	15	50.01
2	有机酸及酯类	15	21.63	20	18.88
3	醇醛酮类	3	0.85	22	14.47
4	含N杂环类	14	26.50	10	6.64
5	烷烯炔烃类	2	0.55	8	4.24
6	胺类	3	1.39	5	3.45
7	卤代烃	0	0	1	0.15
8	芳烃类	3	1.05	0	0
9	酚类	1	0.54	0	0
10	其他	6	1.22	7	2.16
总计		79	100	88	100

序号	种类	电化学氧化前		电化学氧化后
序号	种类	数目/种	占比/%	数目/种	占比/%
1	有机腈类	32	46.27	15	50.01
2	有机酸及酯类	15	21.63	20	18.88
3	醇醛酮类	3	0.85	22	14.47
4	含N杂环类	14	26.50	10	6.64
5	烷烯炔烃类	2	0.55	8	4.24
6	胺类	3	1.39	5	3.45
7	卤代烃	0	0	1	0.15
8	芳烃类	3	1.05	0	0
9	酚类	1	0.54	0	0
10	其他	6	1.22	7	2.16
总计		79	100	88	100

项目	原水	电化学氧化出水	电渗析淡水
pH	6.96	6.55	6.34
电导率/（μS·cm^-1）	174	12 500	202
NH₄ ⁺-N/（mg·L^-1）	5.2	29.6	0.56
TN/（mg·L^-1）	754	125.8	78.4
TOC/（mg·L^-1）	1 654	335.2	156.5
BOD₅/（mg·L^-1）	424	—	140
COD/（mg·L^-1）	2 824	580	324.3
B/C	0.15	—	0.43

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