Experimental and mechanism studies on degradation of the organics in biochemical influent of coal chemical industry by ozone catalytic oxidation

doi:10.16085/j.issn.1000-6613.2021-0872

Abstract

Abstract:

The process conditions and mechanism of ozone catalytic oxidation degradation of organic compounds in the biochemical influent of coal chemical industry were studied. Taking a coal chemical biochemical influent in Xinjiang as model, the types and amounts of refractory organics in wastewater were determined. Then, ozone catalytic oxidation tests of the refractory organics were carried out and the removal rates of chemical oxygen demand (COD) under different technological conditions were investigated to determine the best reaction conditions. Finally, dissolved organic matter (DOM) was taken as the research object to analyze the degradation law of refractory organics in wastewater. The results showed that the organic compounds were mainly phenol and humic acid. The optimal process parameters were as follows: catalyst dosage was 1.2L/L, ozone concentration was 500mg/L, and ozone aeration rate was 2.5m³/h. The UV₂₅₄ of each component decreased after the reaction, and the removal rates were in the order of hydrophobic neutral substance(HoN)>hydrophilic basic substance(HiB)>hydrophobic basic substance(HoB)>hydrophilic acid substance(HiA)>hydrophobic acid substance(HoA)>hydrophilic neutral substance(HiN). After the catalytic oxidation by ozone, the fluorescence intensities of fulvic acids, humic acids, protein and soluble biological metabolites all decreased.

Key words: ozone catalytic oxidation, coal chemical, refractory organic matter, degradation law, dissolved organic matter

摘要：

研究了臭氧催化氧化降解煤化工生化进水有机物的工艺条件及机理。本文以新疆某煤化工生化进水为研究对象，确定废水中难降解有机物的种类及含量，开展臭氧催化氧化试验，探讨工艺条件对化学需氧量（COD）的去除率，最后以溶解性有机物（DOM）为对象，解析废水难降解有机物的降解规律。结果表明：废水中主要为苯酚及腐殖酸；最佳工艺参数为催化剂投加量1.2L/L、臭氧浓度500mg/L、臭氧通气量2.5m³/h；反应后各组分的UV₂₅₄均下降，去除率从高到低为疏水性中性物质（HoN）>亲水性碱性物质（HiB）>疏水性碱性物质（HoB）>亲水性酸性物质（HiA）>疏水性酸性物质（HoA）>亲水性中性物质（HiN），富里酸类、腐殖酸类、蛋白质类及溶解性生物代谢产物等荧光强度均降低。

关键词: 臭氧催化氧化, 煤化工, 难降解有机物, 降解规律, 溶解性有机物

CLC Number:

X703

WANG Jikun, LI Yang, CHEN Guifeng, LIU Min, LI Wenbo, HE Yicong. Experimental and mechanism studies on degradation of the organics in biochemical influent of coal chemical industry by ozone catalytic oxidation[J]. Chemical Industry and Engineering Progress, 2021, 40(10): 5837-5844.

王吉坤, 李阳, 陈贵锋, 刘敏, 李文博, 何毅聪. 臭氧催化氧化降解煤化工生化进水有机物的实验及机理[J]. 化工进展, 2021, 40(10): 5837-5844.

Figures/Tables 14

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序号	保留时间 /min	质量分数 /%	组成
1	8.721	45.247	苯酚
2	10.172	7.153	2-甲基苯酚
3	10.550	30.556	3-甲基苯酚
4	11.389	1.010	2，5-二甲基苯酚
5	11.590	0.716	4-乙基苯酚
6	11.606	3.954	2，3-二甲基苯酚
7	11.817	1.294	3，4-二甲基苯酚
8	12.050	7.257	1-（2-羟基-6-甲氧基苯基）乙基-1-酮
9	12.310	0.215	2-乙基-4-甲基苯酚
10	12.434	0.300	2-羟基-5-甲基间苯二甲醇
11	12.629	0.851	6-羟基-4-甲氧基-2，3-二甲基苯
12	12.694	0.597	5-茚醇
13	12.840	0.442	4-烯丙基苯酚
14	13.809	0.406	2-萘酚

序号	保留时间 /min	质量分数 /%	组成
1	8.721	45.247	苯酚
2	10.172	7.153	2-甲基苯酚
3	10.550	30.556	3-甲基苯酚
4	11.389	1.010	2，5-二甲基苯酚
5	11.590	0.716	4-乙基苯酚
6	11.606	3.954	2，3-二甲基苯酚
7	11.817	1.294	3，4-二甲基苯酚
8	12.050	7.257	1-（2-羟基-6-甲氧基苯基）乙基-1-酮
9	12.310	0.215	2-乙基-4-甲基苯酚
10	12.434	0.300	2-羟基-5-甲基间苯二甲醇
11	12.629	0.851	6-羟基-4-甲氧基-2，3-二甲基苯
12	12.694	0.597	5-茚醇
13	12.840	0.442	4-烯丙基苯酚
14	13.809	0.406	2-萘酚

序号	分子量/Da	总有机碳值/mg·L^-1
1	1000	3690
2	5000	4521
3	10000	4630
4	30000	4630
5	100000	4665

序号	分子量/Da	总有机碳值/mg·L^-1
1	1000	3690
2	5000	4521
3	10000	4630
4	30000	4630
5	100000	4665

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