工业水处理 ›› 2024, Vol. 44 ›› Issue (10): 60-67. doi: 10.19965/j.cnki.iwt.2023-1003

• 现代养殖业水处理技术专题 • 上一篇    下一篇

养殖废水中Fe3+累积对藻菌共生体EPS分泌及膜污染特征的影响

田茂芝(), 丁梓尧, 孙晨, 周玮钰, 王圣智, 万瀚宇, 李昆()   

  1. 南昌大学资源与环境学院,鄱阳湖环境与资源利用教育部重点实验室,江西 南昌 330031
  • 收稿日期:2024-07-22 出版日期:2024-10-20 发布日期:2024-10-23
  • 作者简介:

    田茂芝(2000— ),硕士研究生。E-mail:

    李昆,博士,副教授。E-mail:

  • 基金资助:
    国家自然科学基金项目(51768043); 江西省自然科学基金项目(20212BAB203035); 江西省研究生创新专项资金项目(YC2023-S169)

Effects of Fe3+ on EPS secretion and membrane fouling of microalgae-bacteria symbionts for breeding wastewater treatment

Maozhi TIAN(), Ziyao DING, Chen SUN, Weiyu ZHOU, Shengzhi WANG, Hanyu WAN, Kun LI()   

  1. Key Laboratory of Poyang Lake Environment and Resources Utilization, Ministry of Education, School of Resource & Environment, Nanchang University, Nanchang 330031, China
  • Received:2024-07-22 Online:2024-10-20 Published:2024-10-23

摘要:

通过在养殖废水中分别投加不同浓度的Fe3+进行藻菌共生体的培养,探究Fe3+对藻菌共生体胞外聚合物(EPS)分泌的影响,并将提取的EPS各组分拆分,结合膜污染测试实验考察藻菌共生体混合液和其各组分导致的膜污染特征变化情况。实验结果表明,Fe3+的加入通过影响EPS各组分的含量可有效减缓膜污染,在其投加质量浓度为150 mg/L时,膜污染最轻。采用Hermia经典模型对膜通量衰减过程进行拟合分析,结果发现,滤饼层的形成是膜污染形成的主要原因之一,此外Fe3+增加会引起微生物絮体粒径变化,进而对膜污染产生显著影响。膜面污染物成分分析发现,其主要组成成分为色氨酸类蛋白质、酪氨酸类蛋白质和微生物代谢副产物。

关键词: 藻菌共生体, 胞外聚合物, 养殖废水, Fe3+, 膜污染

Abstract:

By cultivating microalgae-bacteria consortia in breeding wastewater with varying concentrations of Fe3+, this study investigated the impact of Fe3+ on the secretion of extracellular polymeric substances(EPS) by the consortia. The extracted EPS components were fractionated, and membrane fouling tests were conducted to examine the changes in membrane fouling characteristics by the microalgae-bacteria mixed liquor and each component. The experimental results indicated that the addition of Fe3+ effectively mitigated membrane fouling, with the least fouling observed at iron mass concentration of 150 mg/L. The Hermia classic model was used to fit and analyze the membrane flux attenuation process. The results showed that the formation of the filter cake layer was one of the main causes of membrane fouling. In addition, an increase of Fe3+ would cause changes in the particle size of microbial flocs, which would have a significant impact on membrane fouling. Analysis of the membrane surface foulants showed that the main components were tryptophan-like proteins, tyrosine-like proteins, and microbial metabolic by-products.

Key words: microalgae-bacteria symbionts, extracellular polymeric substances, swine wastewater, Fe3+, membrane fouling

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