Fast granulation of halophilic activated sludge treating low-strength organic saline wastewater via addition of divalent cations
Fast granulation of halophilic activated sludge treating low-strength organic saline wastewater via addition of divalent cations
复制标题
添加二价阳离子的嗜盐活性污泥快速颗粒化处理低浓度有机盐废水
DOI：
10.1016/j.chemosphere.2020.128396
复制
发表时间：
2021-02-01
期刊：
影响因子：
8.8
通讯作者：
Alam, Fakhri
中科院分区：
文献类型：
--
作者：
Cui, You-Wei;Huang, Ji-Lin;Alam, Fakhri
嗜盐活性污泥造粒是解决含盐废水生物处理中固液分离问题的重要解决方案。本研究表明，通过在低有机负荷的盐水进水中添加二价阳离子，可以培养平均直径为910+/-10μm的嗜盐颗粒污泥。二价阳离子和粒径之间的密切相关性表明Ca2+在造粒过程中发挥了主要作用。 Ca2+在嗜盐颗粒污泥中积累，为微生物聚集提供了无机载体，导致黄杆菌科嗜盐细菌占优势。嗜盐细菌分泌大量胞外聚合物(EPS)，其中含有70.0+/-0.02%的蛋白质。通过增强蛋白质和Ca2+的EPS网络，形成嗜盐颗粒污泥。 Mg2+ 的添加增强了 Mg2+ 的网络和松散结合的 EPS，而这种网络可能会因 Na+ 取代而被破坏。本研究为嗜盐活性污泥提供了一种有效的颗粒化方法。 (C) 2020 Elsevier Ltd. 保留所有权利。
Granulation of halophilic activated sludge is an important solution to solve the problem of solid-liquid separation in biological treatment of saline wastewater. This study demonstrated that by adding divalent cations into the saline influent with low organic load, halophilic granular sludge with an average diameter of 910 +/- 10 mu m can be cultivated. The close correlation between divalent cations and particle size indicated that Ca2+ played a major role in the granulation process. Ca2+ was accumulated in halophilic granular sludge, which provided an inorganic carrier for microbial aggregation and leaded to the dominance of halophilic bacteria of the family Flavobacteriaceae. The halophilic bacteria secreted a large amount of extracellular polymeric substances (EPS), which contained 70.0 +/- 0.02% protein. By enhancing the EPS network of protein and Ca2+, halophilic granular sludge was formed. The addition of Mg2+ enhanced the network of Mg2+ and loosely bound EPS, which could be destroyed due to Na+ substitution. This study provides an effective granulation method for halophilic activated sludge. (C) 2020 Elsevier Ltd. All rights reserved.