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首页> 外文会议>2011 Membrane technology conference amp; exposition. >Effect of Biological Activated Carbon Filters on the Removal of Biodegradable NOM, Molecular Weight Membrane Fouling
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Effect of Biological Activated Carbon Filters on the Removal of Biodegradable NOM, Molecular Weight Membrane Fouling

机译：生物活性炭过滤器对生物可降解NOM，分子量和膜污染去除的影响

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Natural organic matter is a complex mixture of various organics including humic substances, carbohydrates, amino acids and carboxylic acids that exist in natural waters. Integrated treatment processes that combine oxidation processes (such as ozonation or UV/H2O2) and activated carbon biofilters have been shown to be very effective at reducing natural organic matter (NOM) levels by transforming a significant portion of NOM into biodegradable organic matter (BOM). Previous work has shown that changes in the structure of NOM can affect the fouling behaviour of membranes. Many pretreatment technologies are currently being developed to reduce the fouling rate during filtration and extend the operating lifetime of membranes. It has been hypothesized that decreasing the molecular weight of NOM can reduce the extent of fouling at the membrane surface, therefore the relationship between molecular weight distribution of oxidized NOM and fouling is of importance. The current research project investigated the effect of ozone and advanced oxidation at various doses on specific parameters including: biodegradability, formation of disinfection by-products, change in molecular weight and organic carbon content. The effect of different oxidations processes on the rate of biodegradation was investigated. Initially, biodegradation occurs quite rapidly in activated carbon biofilters. However, a residual amount of biodegradable organic matter (BOM) typically remains in the effluent of the bio filter. Of particular interest was the change in molecular weight throughout biodegradation within the activated carbon biofilters and the effect of different oxidation doses. Membrane filtration with raw water, oxidized water and biofiltered water was performed in order to determine the ability of integrated treatment processes to reduce fouling. This project provides insight into the benefits and shortcomings of oxidation processes, in terms of generating biodegradable organic matter, and the effects of these oxidation processes on the molecular weight of NOM. In addition, it provides insight into the suitability these integrated oxidation processes as pre-treatment options to reduce the rate of fouling in membrane filtration.
机译：天然有机物是天然水中存在的各种有机物的复杂混合物，包括腐殖质，碳水化合物，氨基酸和羧酸。结合氧化工艺（例如臭氧化或UV / H2O2）和活性炭生物滤池的综合处理工艺已显示出非常有效的降低自然有机物（NOM）水平的作用，方法是将NOM的大部分转化为可生物降解的有机物（BOM）。 。先前的工作表明，NOM结构的变化会影响膜的结垢行为。当前正在开发许多预处理技术以降低过滤过程中的结垢率并延长膜的使用寿命。已经假设降低NOM的分子量可以减少膜表面的结垢程度，因此氧化的NOM的分子量分布与结垢之间的关系是重要的。当前的研究项目研究了不同剂量的臭氧和高级氧化对特定参数的影响，这些特定参数包括：生物降解性，消毒副产物的形成，分子量和有机碳含量的变化。研究了不同氧化过程对生物降解速率的影响。最初，生物降解在活性炭生物滤池中非常迅速地发生。但是，残留量的可生物降解的有机物（BOM）通常保留在生物过滤器的流出物中。特别令人感兴趣的是活性炭生物滤池中整个生物降解过程中分子量的变化以及不同氧化剂量的影响。用原水，氧化水和生物过滤水进行膜过滤，以确定综合处理工艺减少结垢的能力。该项目从产生可生物降解的有机物的角度，洞察了氧化过程的优缺点，以及这些氧化过程对NOM分子量的影响。另外，它提供了对这些集成氧化工艺作为预处理选项的适用性的见解，以减少膜过滤中的结垢率。

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