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从膜生物反应器运行不同工况下的三重污染层角度评价膜污染。

A triple fouling layers perspective on evaluation of membrane fouling under different scenarios of membrane bioreactor operation.

机构信息

Faculty of Civil Engineering, Sharif University of Technology, Tehran, Iran.

Institute of Water and Energy, Sharif University of Technology, Tehran, Iran.

出版信息

J Environ Health Sci Eng. 2014 Jun 6;12:91. doi: 10.1186/2052-336X-12-91. eCollection 2014.

DOI:10.1186/2052-336X-12-91
PMID:25002969
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4079216/
Abstract

One of the main factors affecting membrane fouling in MBRs is operational conditions. In this study the influence of aeration rate, filtration mode, and SRT on hollow fiber membrane fouling was investigated using a triple fouling layers perspective. The sludge microbial population distribution was also determined by PCR method. Through various applied operational scenarios the optimal conditions were: aeration rate of 15 LPM; relaxation mode with 40s duration and 8 min. interval; and SRT of 30 days. The similarity between SMP variations in triple fouling layers with its corresponding hydraulic resistance confirmed the effect of SMP on membrane fouling. Among three fouling fractions, the upper (rinsed) layer found to have the most effect on membrane fouling which implies the critical role of aeration, but as for multilateral effects of aeration, the optimal aeration rate should be determined more precisely. Relaxation interval was more effective than its duration for fouling control. SRT variations in addition to influencing the amount of SMP, also affect on the structure of these material. At longer SRTs (20, 30 days) a greater percentage of SMP could penetrate into the membrane pores and for shorter SRTs they accumulate more on membrane surface. Results showed that there is a very good correlation between total hydraulic resistance (Log R) and protein to carbohydrate ratio at the rinsed layer (P1/C1). Considering significant effects of aeration and SRT conditions on this ratio (according to data), it is very determinative to apply the optimal aeration and SRT conditions.

摘要

影响 MBR 膜污染的主要因素之一是操作条件。本研究从三层污垢层的角度出发，考察了曝气速率、过滤方式和污泥停留时间（SRT）对中空纤维膜污染的影响。同时，还采用 PCR 方法确定了污泥微生物种群的分布。通过各种应用操作场景，确定了最佳条件为：曝气速率为 15 LPM；松弛模式持续时间为 40s，间隔 8min；SRT 为 30 天。三层污垢层中 SMP 变化与相应水力阻力之间的相似性证实了 SMP 对膜污染的影响。在三种污垢层中，上（冲洗）层对膜污染的影响最大，这意味着曝气的作用至关重要，但就曝气的多方面影响而言，最佳曝气速率还需要更精确地确定。与持续时间相比，松弛间隔对控制污染更有效。SRT 的变化不仅会影响 SMP 的量，还会影响这些物质的结构。在较长的 SRT（20、30 天）下，更多的 SMP 可以渗透到膜孔中，而在较短的 SRT 下，它们会在膜表面上积累更多。结果表明，在冲洗层（P1/C1）中，总水力阻力（Log R）与蛋白质与碳水化合物的比值之间存在很好的相关性。考虑到曝气和 SRT 条件对该比值的显著影响（根据数据），应用最佳的曝气和 SRT 条件非常重要。

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