Changes in characteristics of soluble microbial products in membrane bioreactors associated with different solid retention times: Relation to membrane fouling
Changes in characteristics of soluble microbial products in membrane bioreactors associated with different solid retention times: Relation to membrane fouling
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DOI：
10.1016/j.watres.2008.11.024
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发表时间：
2009-03-01
期刊：
影响因子：
12.8
通讯作者：
Watanabe, Yoshimasa
中科院分区：
文献类型：
--
作者：
Kimura, Katsuki;Naruse, Takuro;Watanabe, Yoshimasa
膜生物反应器（MBR）是一种有前途的废水处理技术，但需要有效控制膜污染，这增加了操作和维护成本。据报道，在用于废水处理的MBR的操作中，可溶性微生物产物（SMP）充当主要污染物。在这项研究中，SMP在MBR操作与不同的污泥停留时间（SRT）进行了调查，通过各种分析技术和它们的关系，膜污染的演变被认为是。在实验室中用合成废水进行了实验室规模的过滤实验，以消除使用真实的废水时会发生的波动，这会导致SMP组成的波动。三个相同的浸没式MBR在相同的条件下运行约50天，除了SRT（17，51和102天）。通过常规分析方法（即，苯酚-硫酸法和Lowry法）在短SRT的情况下具有显著性。然而，膜生物反应器中的膜污染程度并不直接相关的SMP在反应器中的浓度估计由传统的分析方法。非传统的分析方法，如激发-发射矩阵（EEM）荧光光谱显示，SMP在三个反应器中的特性显着不同，这取决于SRT。在操作结束时，从污染的膜中提取污垢，并与每个MBR中的SMP进行比较。它清楚地表明，污垢的特性是不同的，这取决于SRT，和SMP和提取的污垢之间的相似性被认为是在每个MBR的EEM测量结果的基础上。然而，根据SMP的常规分析方法得到的结果，没有发现这种相似性。本研究的结果表明，使用传统的方法分析SMP是不适合的膜生物反应器中的膜污染的调查。(C)2008爱思唯尔有限公司保留所有权利。
A membrane bioreactor (MBR) is a promising wastewater treatment technology, but there is a need for efficient control of membrane fouling, which increases operational and maintenance costs. Soluble microbial products (SMP) have been reported to act as major foulants; in the operation of MBRs used for wastewater treatment. In this study, SMP in MBRs operated with different sludge retention times (SRTs) were investigated by means of various analytical techniques and their relations to the evolution of membrane fouling were considered. Bench-scale filtration experiments were carried out in a laboratory with synthetic wastewater to eliminate fluctuations that would occur with the use of real wastewater and that would lead to fluctuations in compositions of SMP. Three identical submerged MBRs were operated for about 50 days under the same conditions except for SRT (17, 51 and 102 days). Accumulation of SMP in the MBRs estimated by conventional analytical methods (i.e., the phenol-sulfuric acid method and the Lowry method) was significant in the cases of short SRTs. However, the degrees of membrane fouling in the MBRs were not directly related to the concentrations of SMP in the reactors estimated by the conventional analytical methods. Non-conventional analytical methods such as excitation-emission matrix (EEM) fluorescence spectroscopy revealed that characteristics of SMP in the three reactors considerably differed depending on SRT. Foulants were extracted from the fouled membranes at the end of the operation and were compared with SMP in each MBR. It was clearly shown that characteristics of the foulants were different depending on SRT, and similarities between SMP and the extracted foulants were recognized in each MBR on the basis of results of EEM measurements. However, such similarities were not found on the basis of results obtained by using the conventional methods for analysis of SMP. The results of this study suggest that the use of conventional methods for analysis of SMP is not appropriate for investigation of membrane fouling in MBRs. (C) 2008 Elsevier Ltd. All rights reserved.