The biological effect of metal ions on the granulation of aerobic granular activated sludge
The biological effect of metal ions on the granulation of aerobic granular activated sludge
复制标题
金属离子对好氧颗粒活性污泥颗粒化的生物效应
DOI：
10.1016/j.jes.2015.10.031
复制
发表时间：
2016-06-01
影响因子：
6.9
通讯作者：
Zhu, Jianrong
中科院分区：
文献类型：
--
作者：
Hao, Wen;Li, Yaochen;Zhu, Jianrong
作为一种特殊的生物膜结构，微生物附着被认为在好氧颗粒活性污泥（AGAS）的颗粒化过程中发挥着重要作用。本实验旨在研究废水生物处理系统中最常见的Ca2+、Mg2+、Cu2+、Fe2+、Zn2+和K+等离子对AGAS及其来源的絮状活性污泥（FAS）微生物附着的生物效应，为AGAS的快速培养和稳定性控制提供新策略。结果表明，AGAS的附着生物量比未添加金属离子的FAS高约300%。不同的金属离子对微生物的附着过程有不同的影响。 FAS和AGAS对金属离子的反应也不同，事实上，AGAS对金属离子更敏感。具体而言，Ca2+、Mg2+和K+在适当浓度下均能增强AGAS和FAS的微生物附着能力，Cu2+、Fe2+和Zn2+在低浓度下也有利于FAS的微生物附着，但Cu2+、Fe2+和Zn2+即使在极低浓度下也极大地抑制AGAS的附着过程。此外，基于酰化高丝氨酸内酯（AHL）的群体感应系统、细胞外聚合物的含量和污泥的相对疏水性受金属离子的影响很大。由于这些参数都与微生物的附着过程密切相关，因此这些参数的变化可能会影响微生物的附着。 (C) 2016 中国科学院生态环境研究中心。由 Elsevier B.V. 出版
As a special biofilm structure, microbial attachment is believed to play an important role in the granulation of aerobic granular activated sludge (AGAS). This experiment was to investigate the biological effect of Ca2+, Mg2+, Cu2+, Fe2+, Zn2+, and K+ which are the most common ions present in biological wastewater treatment systems, on the microbial attachment of AGAS and flocculent activated sludge (FAS), from which AGAS is always derived, in order to provide a new strategy for the rapid cultivation and stability control of AGAS. The result showed that attachment biomass of AGAS was about 300% higher than that of FAS without the addition of metal ions. Different metal ions had different effects on the process of microbial attachment. FAS and AGAS reacted differently to the metal ions as well, and in fact, AGAS was more sensitive to the metal ions. Specifically, Ca2+, Mg2+, and K+ could increase the microbial attachment ability of both AGAS and FAS under appropriate concentrations, Cu2+, Fe2+, and Zn2+ were also beneficial to the microbial attachment of FAS at low concentrations, but Cu2+, Fe2+, and Zn2+ greatly inhibited the attachment process of AGAS even at extremely low concentrations. In addition, the acylated homoserine lactone (AHL)-based quorumsensing system, the content of extracellular polymeric substances and the relative hydrophobicity of the sludges were greatly influenced by metal ions. As all these parameters had close relationships with the microbial attachment process, the microbial attachment may be affected by changes of these parameters. (C) 2016 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.