The Combination of Coagulation and Adsorption for Controlling Ultra-Filtration Membrane Fouling in Water Treatment
The Combination of Coagulation and Adsorption for Controlling Ultra-Filtration Membrane Fouling in Water Treatment
复制标题
混凝与吸附相结合控制水处理中超滤膜污染
DOI：
10.3390/w11010090
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发表时间：
2019-01-01
期刊：
影响因子：
3.4
通讯作者：
Shen, Xue
中科院分区：
文献类型：
--
作者：
Bu, Fan;Gao, Baoyu;Shen, Xue
超滤技术由于膜性能的提高和成本的降低，在饮用水处理中得到越来越多的应用。然而，膜污染是限制超滤技术应用的主要因素。在这项研究中，我们研究了四种不同的预处理：混凝，吸附，混凝后吸附（C-A），同时混凝和吸附（C+A），对膜污染和天然有机物的去除效率的影响。结果表明，吸附过程需要大量的吸附剂，并在膜表面形成致密的滤饼层，导致严重的膜污染。与单独吸附相比，混凝和C-A过程降低了4.9 kPa的跨膜压力。这是由于在膜表面上的颗粒较少积聚。在水质方面，C-A超滤工艺对天然有机物和消毒副产物前体物的去除效率最高。因此，混凝后投加吸附剂是缓解超滤膜污染、提高处理效果的重要途径。
Ultra-filtration technology has been increasingly used in drinking water treatment due to improvements in membrane performance and lowering of costs. However, membrane fouling is the main limitation in the application of ultra-filtration technology. In this study, we investigated the impact of four different pre-treatments: Coagulation, adsorption, coagulation followed by adsorption (C-A), and simultaneous coagulation and adsorption (C+A), on membrane fouling and natural organic matter removal efficiency. The results showed that adsorption process required a large amount of adsorbent and formed a dense cake layer on the membrane surface leading to severe membrane fouling. Compared to adsorption alone, the coagulation and C-A processes decreased the transmembrane pressure by 4.9 kPa. It was due to less accumulation of particles on the membrane surface. As for water quality, the C-A ultra-filtration process achieved the highest removal efficiencies of natural organic matter and disinfection by-product precursors. Therefore, the addition of adsorbent after coagulation is a potentially important approach for alleviating ultra-filtration membrane fouling and enhancing treatment performance.