Examination of three theories for mechanisms of cation-induced bioflocculation
Examination of three theories for mechanisms of cation-induced bioflocculation
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DOI：
10.1016/s0043-1354(01)00254-8
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发表时间：
2002-02-01
期刊：
影响因子：
12.8
通讯作者：
Higgins, MJ
中科院分区：
文献类型：
--
作者：
Sobeck, DC;Higgins, MJ
来自不同研究的研究已被用来支持三种不同的理论，有关阳离子在生物絮凝中的作用。这些理论是藻酸盐理论、Derjaguin、朗道、Verwey和Overbeek（DLVO）理论和二价阳离子桥接（DCB）理论。本研究的目的是研究阳离子在生物絮凝中的作用，以确定哪种理论，如果有的话，最好的描述阳离子诱导的生物絮凝。使用实验室规模的活性污泥系统进行实验，其中细菌蛋白胨作为进料。饲料中添加浓度递增的钙、镁或钠。在稳态期间，在每个反应器中分析絮凝物的性质。向进料中单独添加钙或镁导致SVI、CST、SRF、滤饼固体和絮凝物强度的改善，并且这些二价阳离子中的每一种产生类似的结果。相对于对照反应器，向进料中添加钠导致絮凝物性质劣化。这些结果的分析表明，DCB理论最好地解释了阳离子的作用。对不同研究之间的差异进行了检查，认为是不同研究中不同实验程序的结果，特别是使用短期分批试验与连续流反应器研究。此外，DCB理论的影响表明，活性污泥系统应尝试降低一价阳离子与二价阳离子的比例，以改善絮凝物的性能和处理性能。(C)2002爱思唯尔科技有限公司版权所有。
Research from different studies has been used to support three different theories pertaining to the role of cations in bioflocculation. These theories are the alginate theory, Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory, and divalent cation bridging (DCB) theory. The objectives of this research were to examine the role of cations in bioflocculation to determine which theory, if any, best describes cation induced bioflocculation. Experiments were performed using laboratory scale activated sludge systems with bactopeptone as a feed. The feed was supplemented with either calcium, magnesium, or sodium at increasing concentrations. Floe properties were analyzed in each reactor during steady state periods. The addition of calcium or magnesium to the feed individually resulted in improvements in SVI, CST, SRF, cake solids and floe strength and each of these divalent cations produced similar results. The addition of sodium to the feed resulted in a deterioration in floe properties relative to a control reactor. Analysis of these results suggest that the DCB theory best explains the role of cations. The discrepancies between different studies were examined and are thought to be a result of different experimental procedures in different studies and in particular the use of short-term batch tests versus continuous flow reactor studies. In addition, the implications of DCB theory suggests that activated sludge systems should attempt to lower the ratio of monovalent to divalent cations to improve floe properties and treatment performance. (C) 2002 Elsevier Science Ltd. All rights reserved.