剩余污泥厌氧发酵和微塑料的相互作用机制

郑晓英; 杨珊珊; 杨萌萌; 赵志琳; 张会杰; 韩宗朔; 周超

doi:10.13205/j.hjgc.202304013

剩余污泥厌氧发酵和微塑料的相互作用机制

doi: 10.13205/j.hjgc.202304013

1. 河海大学环境学院浅水湖泊综合治理与资源开发教育部重点实验室, 南京 210098;
2. 中机国际工程设计研究院有限责任公司华东分院, 南京 210049

基金项目:

国家自然科学基金项目(51678214)

国家重点研发计划项目(2016YFC0400804)

江苏高校优势学科建设工程资助项目(PAPD)

详细信息

作者简介:
郑晓英(1976-),女,教授,主要研究方向为污水资源化利用理论与技术。zhxyqq@hhu.edu.cn

通讯作者:
杨珊珊(1999-),女,硕士研究生,主要研究方向为污水资源化利用理论与技术。Yangss99@163.com

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出版历程
- 收稿日期: 2022-08-03
- 网络出版日期: 2023-05-26
- 刊出日期: 2023-04-01

INTERACTION BETWEEN ANAEROBIC FERMENTATION OF WASTE ACTIVATED SLUDGE AND MICROPLASTICS

1. Key Laboratory of Integrated Regulation & Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China;
2. East China Branch, China Machinery International Engineering Design & Research Institute Co., Ltd., (CMIE), Nanjing 210049, China

摘要

摘要: 以聚乙烯(PE)微塑料作为典型微塑料,在恒定碱性条件(pH=10)和非恒定碱性(初始pH=10)条件下,研究PE和剩余污泥厌氧发酵之间的相互作用机制。结果表明:在污泥厌氧发酵初始阶段,PE对产酸有明显的促进作用,而在后期呈相反趋势。厌氧发酵60 d时,恒定碱性条件下,投加PE组(R2)的VFAs产量与空白组R1相比降低了31.46%;在非恒定碱性条件下,投加PE组(R4)中VFAs产量与空白组R3相比降低了15.78%,说明PE长期胁迫对污泥厌氧发酵VFAs的产生有抑制作用。同时,PE会刺激微生物分泌更多的EPS(主要成分为蛋白质),降低Zeta电位并破坏EPS的结构。另外,综合扫描电子显微镜(SEM)、拉曼光谱、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)、水接触角分析微塑料的性质特征发现,由于环境条件和微生物活动的影响,污泥厌氧发酵会导致PE老化,且非恒定碱性条件下微塑料的老化速率更快。
- 聚乙烯(PE) /
- 剩余污泥 /
- 厌氧发酵 /
- 产酸 /
- 老化
Abstract: The interaction mechanism between the typical microplastic of polyethylene (PE) and waste activated sludge anaerobic fermentation was studied under constant alkaline condition (constant pH=10) and unsteady alkaline (initial pH=10) condition. The results showed that PE had a significant contribution to acid production in the initial stage of anaerobic sludge fermentation, and showed the opposite trend in the later period. Under constant alkaline condition, compared to the blank group(R1), the VFAs production in the PE group (R2) decreased by 31.46%; under unsteady alkaline fermentation, compared to the blank group(R3), the VFAs production in the PE group (R4) decreased by 15.78%, indicating that PE had an inhibitory effect on the production of VFAs in anaerobic fermentation. Simultaneously, PE stimulated microorganisms to secrete more EPS (mainly proteins), decreased the zeta potential and disrupted the structure of EPS. In addition, the microplastic samples were characterized by SEM, Raman spectroscope, FTIR, XPS, and contact angle meter. The analysis results revealed that anaerobic fermentation of waste activated sludge system led to PE ageing due to environmental conditions and microbial activities, and the ageing rate of microplastics was faster under unsteady alkaline condition.
- polyethylene (PE) /
- waste activated sludge /
- anaerobic fermentation /
- acid production /
- aging

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