Mn2+催化臭氧氧化活性污泥强化溶胞

doi:10.16085/j.issn.1000-6613.2021-0601

摘要/Abstract

摘要：

研究了不同浓度活性炭、活性焦和Mn²⁺催化作用下臭氧氧化污泥碳源释放情况，发现Mn²⁺为较佳催化剂。本文进一步对比考察了不同Mn²⁺投加量对催化臭氧化污泥溶胞释放有机物的影响以及反应前后污泥特性的差异，探究了Mn²⁺催化臭氧化促进溶胞作用的机理。结果表明，在臭氧氧化污泥时添加Mn²⁺能促进污泥碳源的释放，其中当Mn²⁺投加量为1.5mmol/L时，污泥碳源的释放效果较佳，溶解性化学需氧量的变化值（ΔSCOD）质量浓度为76mg/L，约为单独臭氧氧化（O₃组）的4倍；污泥絮体胞外聚合物溶解性蛋白和腐殖质含量较原泥（空白组）和O₃组相比均有显著增加，分别为2倍和2.3倍，证实了Mn²⁺催化氧化促进了活性污泥胞内有机物的溶出。进一步的机理探究得出，O₃+Mn²⁺组·OH产量为O₃组的1.15～1.74倍，说明Mn²⁺催化氧化促进了反应过程中活性自由基尤其是·OH的生成。Mn²⁺催化臭氧氧化活性污泥在强化污泥破胞的同时，对污泥的理化性质影响较小，基本与单独臭氧氧化维持在同一水平，后续将其应用于基于臭氧旁路处理的污泥原位减量连续工艺有较大的可行性和实际意义。

关键词: 均相催化臭氧氧化, 锰离子, 活性污泥, 碳源释放

Abstract:

The release of carbon source from ozonation sludge under the catalysis of activated carbon, activated coke and Mn²⁺ at different concentrations was studied, and it was found that Mn²⁺ was an appropriate one. The effects of different dosage of Mn²⁺ on organic matter release and the differences in sludge characteristics before and after reaction were compared, and the mechanism of catalytic ozonation of Mn²⁺ to promote cellular dissolution was further explored. Results showed that the carbon source solubilization and biodegradability was significantly improved by adding a certain amount of Mn²⁺, and 1.5mmol/L of Mn²⁺ addition was the optimal dosage with the concentration of ΔSCOD of 76mg/L which was about 4 times higher than traditional one (O₃ group). The contents of soluble protein and humus of extracellular polymer in sludge floc were significantly increased compared with that of blank group and O₃ group, which were 2 times and 2.3 times, respectively. It was confirmed that Mn²⁺ catalyzed oxidation promoted the dissolution of intracellular organic matter in activated sludge. Based on further mechanism exploration, it was concluded that Mn²⁺ catalytic oxidation promoted the generation of active free radical especially for ·OH during the reaction, and the yield of ·OH was 1.15—1.74 times that of the O₃ group. Mn²⁺ catalytic ozonation activated sludge can enhance cell lysis with little effect physicochemical properties of it and basically maintains the same level as O₃ group. It has great feasibility and practical significance to apply it to the continuous process of in-situ sludge ozone-reduction system.

Key words: homogeneous catalytic ozonation, Mn²⁺, activated sludge, carbon source solubilization

中图分类号:

韦婷婷, 王先恺, 詹咏, 陈思思, 董滨. Mn²⁺催化臭氧氧化活性污泥强化溶胞[J]. 化工进展, 2022, 41(2): 1009-1016.

WEI Tingting, WANG Xiankai, ZHAN Yong, CHEN Sisi, DONG Bin. Enhancement of cell lysis in activated sludge by catalytic ozonation of Mn²⁺[J]. Chemical Industry and Engineering Progress, 2022, 41(2): 1009-1016.

图/表 10

图1 催化臭氧氧化实验装置运行示意图

表1 三种催化剂的投加量设置

编号	Mn²⁺/mmol·L^-1	活性炭/g·L^-1	活性焦/g·L^-1
1	0	0	0
2	0.25	0.25	0.25
3	0.5	0.5	0.5
4	0.75	0.75	0.75
5	1.0	1.0	1.0
6	1.25	1.25	1.25
7	1.5	1.5	1.5
8	1.75	1.75	1.75
9	2.0	2.0	2.0

图2 不同催化剂及投加量催化臭氧氧化污泥碳源释放的效果

图3 空白组、O3组和O3+Mn2+组污泥絮体EPS中有机组分的含量

图4 空白组、O3组和O3+Mn2+组污泥絮体EPS中有机组分的组成分布

图5 空白组、O3组和O3+Mn2+组污泥比阻、毛细吸水时间和zeta电位对比

图6 空白组、O3组和O3+Mn2+组污泥粒径的分布示意图

图7 Mn2+催化臭氧氧化污泥溶胞机理示意

图8 O3组和O3+Mn2+组·OH产量对比

图9 催化剂Mn2+经臭氧催化后的Mn 2p XPS图谱

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Mn²⁺催化臭氧氧化活性污泥强化溶胞

Enhancement of cell lysis in activated sludge by catalytic ozonation of Mn²⁺

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