Chemical Industry and Engineering Progress ›› 2022, Vol. 41 ›› Issue (9): 5037-5046.DOI: 10.16085/j.issn.1000-6613.2021-2246

• Resources and environmental engineering • Previous Articles     Next Articles

Effect and mechanisms of microplastics on anaerobic digestion of sludge

LIU Yali1(), ZHANG Hongwei1, KANG Xiaorong2   

  1. 1.School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China
    2.School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, Jiangsu, China
  • Received:2021-11-02 Revised:2021-11-22 Online:2022-09-27 Published:2022-09-25
  • Contact: LIU Yali

微塑料对污泥厌氧消化的影响和机理

刘亚利1(), 张宏伟1, 康晓荣2   

  1. 1.南京林业大学土木工程学院,江苏 南京 210037
    2.南京工程学院环境学院,江苏 南京 211167
  • 通讯作者: 刘亚利
  • 作者简介:刘亚利(1982—),女,副教授,硕士生导师,研究方向为固体废弃物资源化和污水处理。E-mail:liuyali0418@163.com
  • 基金资助:
    国家自然科学基金(51808282);南京林业大学青年创新基金(CX2017025);大学生实践创新训练计划(2020NFUSPITP0355)

Abstract:

The anaerobic digestion of sludge to produce methane is of great significance to the realization of "carbon reduction" in wastewater treatment plants, however, its efficiency of methane production and the stability of process are easily affected by many factors. Microplastics, as an emerging pollutant, are treated by wastewater treatment, and about 99% are enriched in the sludge, which has an impact on the anaerobic digestion process of sludge. Therefore, in this article, the sources and properties of microplastics in wastewater and their destination in wastewater treatment processes were overviewed. Simultaneously, the effects of common microplastics such as polystyrene (PS), polyamide 6 (PA6), and polyvinyl chloride (PVC) on the solubilization, hydrolysis, acidification and methanogenesis stages of sludge were elaborated. Furthermore, the mechanism of microplastics affecting anaerobic digestion was summarized from the perspectives of cell structure, microorganisms and enzyme activities. Finally, on the basis of the current research, it was proposed that the systematic engineering researches (pretreatment technologies, operating conditions, reactor type, etc.), the suppression mechanism of microplastics and their extracts (interactions of microplastics with extracellular polymer substance and cell membrane, iconic coenzymes and cofactors, and characteristic microorganisms), and the synergy/inhibition mechanism between microplastics and other components in the sludge should be carried out in-depth, providing theoretical basis and technical support for the utilization of sludge resources.

Key words: microplastics, sludge, anaerobic digestion, enzyme activity, microorganisms

摘要:

污泥厌氧消化对实现污水处理厂“碳减排”具有重要意义,然其产甲烷效率和工艺稳定性易受多种因素干扰。微塑料作为新兴污染物经污水处理后,约有99%富集在污泥中,对污泥厌氧消化过程产生影响。因此,本文重点总结了污水中微塑料的来源、性质及其在污水处理工艺中的归宿,详细阐述了聚苯乙烯(PS)、聚酰胺6(PA6)、聚氯乙烯(PVC)等常见微塑料对污泥增溶、水解、酸化和产甲烷阶段的影响,并从细胞结构、微生物群落、酶活性等角度进一步归纳了微塑料影响厌氧消化的机理。最后,在概括当前研究成果的基础上,提出应从系统工程研究(预处理技术、运行条件、反应器类型等)、微塑料及其浸出物的抑制机制(微塑料与胞外聚合物、细胞膜的作用、标志性辅酶和辅因子、特征微生物方面)、微塑料与污泥其他组分间的协同/抑制机理等方面开展深入研究,为污泥资源化利用提供理论基础和技术支持。

关键词: 微塑料, 剩余污泥, 厌氧消化, 酶活性, 微生物

CLC Number: 

京ICP备12046843号-2;京公网安备 11010102001994号
Copyright © Chemical Industry and Engineering Progress, All Rights Reserved.
E-mail: hgjz@cip.com.cn
Powered by Beijing Magtech Co. Ltd