化工进展 ›› 2022, Vol. 41 ›› Issue (2): 1009-1016.DOI: 10.16085/j.issn.1000-6613.2021-0601

• 资源与环境化工 • 上一篇    下一篇

Mn2+催化臭氧氧化活性污泥强化溶胞

韦婷婷1,2(), 王先恺3, 詹咏2, 陈思思1, 董滨1()   

  1. 1.同济大学环境科学与工程学院,上海 200092
    2.上海理工大学环境与建筑学院,上海 200093
    3.中国长江三峡集团有限公司长江生态环境工程研究中心,北京 100038
  • 收稿日期:2021-03-25 修回日期:2021-08-30 出版日期:2022-02-05 发布日期:2022-02-23
  • 通讯作者: 董滨
  • 作者简介:韦婷婷(1996—),女,硕士研究生,主要研究方向为水污染控制。E-mail:wtt_usst1030@163.com
  • 基金资助:
    中国长江三峡集团有限公司项目(202003166);国家重点研发计划(2020YFC1908704)

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

WEI Tingting1,2(), WANG Xiankai3, ZHAN Yong2, CHEN Sisi1, DONG Bin1()   

  1. 1.College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
    2.School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
    3.Yangtze Eco-Environment Engineering Research Center, China Three Gorges Corporation, Beijing 100038, China
  • Received:2021-03-25 Revised:2021-08-30 Online:2022-02-05 Published:2022-02-23
  • Contact: DONG Bin

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

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