Pre-coagulation coupled with sponge-membrane filtration for organic matter removal and membrane fouling control during drinking water treatment.
Pre-coagulation coupled with sponge-membrane filtration for organic matter removal and membrane fouling control during drinking water treatment.
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DOI：
10.1016/j.watres.2019.03.052
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发表时间：
2019-06
期刊：
影响因子：
12.8
通讯作者：
L. Deng;H. Ngo;Wenshan Guo;Hongwei Zhang
中科院分区：
文献类型：
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作者：
L. Deng;H. Ngo;Wenshan Guo;Hongwei Zhang
本研究开发了一种新的复合系统，用于饮用水的处理，包括预混凝使用聚合氯化铝（PAC）和膜过滤（MF）与海绵立方体作为生物质载体（P-SMF）。与常规MF（CMF）和PAC混凝后MF（P-MF）相比，P-SMF对营养物、UV 254和溶解有机碳（DOC）的去除效果更好（>65%）。生物聚合物（包括多糖和蛋白质），腐殖物质，亲水性有机物，和其他小分子量（MW）的有机物在CMF中的积累导致最严重的膜污染，再加上最高的孔堵塞和滤饼阻力。预混凝对小分子量和亲水性有机物的去除效果不佳。相反，较大分子量的有机物（即生物聚合物和腐殖物质），小分子量的有机物和亲水性有机化合物可以在P-SMF中通过PAC混凝以显著更大的量去除。这是通过吸附和生物降解附着在这些海绵和悬浮污泥。进一步的微生物群落分析表明，PAC和海绵的组合添加产生了Zoolgloea，Amaricoccus和Reyranella的高度富集，导致生物聚合物的减少，而芽孢杆菌和鞘氨醇菌与腐殖物质的降解有关。此外，P-SMF中的一些α-变形菌可能负责去除低分子量有机物。这些结果表明，预混凝过程耦合添加海绵在微滤系统是一个很有前途的技术，以减轻膜污染。
A new hybrid system was developed in this study for the treatment of drinking water consisting of pre-coagulation using polyaluminium chloride (PACl) and membrane filtration (MF) with sponge cubes acting as biomass carriers (P-SMF). When compared to a conventional MF (CMF) and a MF after coagulation by utilizing PACl (P-MF), better removal of nutrients, UV254and dissolved organic carbon (DOC) (>65%) was obtained from the P-SMF. The accumulation of biopolymers (including polysaccharides and proteins), humic substances, hydrophilic organics, and other small molecular weight (MW) organic matter in the CMF led to the most severe membrane fouling coupled with the highest pore blocking and cake resistance. Pre-coagulation was ineffective in eliminating small MW and hydrophilic organic matter. Conversely, the larger MW organics (i.e. biopolymers and humic substances), small MW organics and hydrophilic organic compounds could be removed in significantly larger quantities in the P-SMF by PACl coagulation. This was achieved via adsorption and the biodegradation by attached biomass on these sponges and by the suspended sludge. Further analyses of the microbial community indicated that the combined addition of PACl and sponges generated a high enrichment ofZoolgloea,AmaricoccusandReyranellaleading to the reduction of biopolymers, andFlexibacterandSphingobiumwere linked to the degradation of humic substances. Moreover, some members ofAlphaproteobacteriain the P-SMF may be responsible for the removal of low MW organics. These results suggest that the pre-coagulation process coupled with adding sponge in the MF system is a promising technology for mitigating membrane fouling.