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首页> 外文期刊>International Biodeterioration & Biodegradation >Reduction of organic matter in drinking water using a hybrid system combined with a rock biofilter and membrane in developing countries
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Reduction of organic matter in drinking water using a hybrid system combined with a rock biofilter and membrane in developing countries

机译：在发展中国家使用混合系统结合岩石生物滤池和膜减少饮用水中的有机物

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In many developing countries, inadequate access to safe drinking water is a major cause of morbidity and mortality. Furthermore, approximately 100 million people worldwide are exposed to arsenic (As) in drinking water. The World Health Organization is thus now encouraging the development and supply of a low-cost technology that can treat domestic water. The present study combined the use of a trickling filter (IT) with a biosand filter (BSF). Additionally, to remove As (V) from water, the use of the absorbents Fe-Mn-Si (FM-alpha) and zero-valent iron was experimentally investigated. Different compositions of influent were supplied in five stages. Efficiency was analyzed in terms of the total organic carbon, turbidity, UV254, As (V) content, flux, power consumption, total solids, and volatile solids of samples taken from four treatment systems (M-1: membrane, M-2: BSF + membrane, M-3: TF + membrane, and M-4: TF + BSF + membrane). Results show that the removal of organic matter and decline in flux over 45 d reduced in the order M-4 > M-2 > M-3 > M-1. The combination of TF, BSF, and M-4 was shown to have the most stable operation even under shock loading. The biofilm of the BSF and sieving effect played an important role in reducing the content of organic matter. The recovered flux of M-1 decreased and the M-1 membrane was backwashed four times. In comparison, M-3 required backwashing four times, M-2 required backwashing once, and M-4 did not require backwashing during operation. The M-4 system removed 95% of organic matter without any cleaning of the top soil throughout the experiment and reduced turbidity by 99%. Between systems M-1 to M-4, the most effective system was M-4 because of its stable operation without backwashing of the membrane throughout the experimental period. The M-2 system with FM-alpha embedded in the layers of sand removed 77% of As (V), while the M-4 system, using zero-valent iron adsorbents, removed 97% of As (V). (C) 2015 Elsevier Ltd. All rights reserved.
机译：在许多发展中国家，获得安全饮用水的不足是发病率和死亡率的主要原因。此外，全世界大约有1亿人暴露于饮用水中的砷（As）。因此，世界卫生组织现在正在鼓励开发和供应可以处理生活用水的低成本技术。本研究结合了滴滤池（IT）和生物砂滤池（BSF）的使用。此外，为了从水中去除As（V），还对吸附剂Fe-Mn-Si（FM-alpha）和零价铁的使用进行了实验研究。分五个阶段提供不同的进水成分。根据总有机碳，浊度，UV254，As（V）含量，通量，功耗，总固体和挥发性固体的效率进行了分析，这些样品来自四个处理系统（M-1：膜，M-2： BSF +膜，M-3：TF +膜，M-4：TF + BSF +膜）。结果表明，在45 d内，有机物的去除和通量的下降按M-4> M-2> M-3> M-1的顺序减少。 TF，BSF和M-4的组合即使在冲击载荷下也显示出最稳定的操作。 BSF的生物膜和筛分作用在减少有机物含量方面起着重要作用。回收的M-1通量降低，并且将M-1膜反洗四次。相比之下，M-3需要四次反洗，M-2需要一次反洗，而M-4在操作期间不需要反洗。在整个实验过程中，M-4系统去除了95％的有机物，而没有对表层土壤进行任何清洁，并且使浊度降低了99％。在系统M-1至M-4之间，最有效的系统是M-4，因为它的操作稳定，并且在整个实验期间都不会反洗膜。在砂层中嵌入了FM-α的M-2系统去除了77％的As（V），而M-4系统使用零价铁吸附剂去除了97％的As（V）。 （C）2015 Elsevier Ltd.保留所有权利。

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