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首页> 外文期刊>Separation and Purification Technology >Role of membrane pore size in tertiary flocculation/adsorption/ ultrafiltration treatment of municipal wastewater
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Role of membrane pore size in tertiary flocculation/adsorption/ ultrafiltration treatment of municipal wastewater

机译：膜孔径在城市污水三级絮凝/吸附/超滤处理中的作用

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Flocculation, adsorption onto powered activated carbon (PAC), and ultrafiltration (UF), alone and in combination, were tested for tertiary treatment of the secondary effluent from municipal wastewater treatment at the Ashkelon plant (in southern Israel). Encouraging and reliable results of total organic carbon (TOC) of <3 mg/l were achieved with a combination of 130 mg/l FeCl3,0.6 g/l PAC and UF. The relative contribution of the UF membrane to the reduction of TOC changed with the molecular weight cut-off (MWCO) of the membrane, from a negligible 2.9% for a 100-kDa-MWCO membrane to 17% for 10- and 2-kDa membranes. The latter membranes, however, developed significant fouling, with a 35% drop in flux during first 30 min of the filtration cycle. The flux drop for the 50- and 100-kDa membranes was in the low range of ～3%. The optimal MWCO interval of 20- to 50-kDa in combination with flocculation/PAC pretreatment gave a significant reduction in organic content with minimal membrane fouling. Detailed GC-MS analysis showed that the combined treatment gave very efficient retention of organic compounds with molecular weights below 800 Da, with the consequent absence of harmful compounds in the tertiary effluent. It was therefore concluded that the recommended flocculation/adsorption protocol constitutes an effective pretreatment for UF and that the obtained tertiary effluent can be used for unrestricted irrigation.
机译：在Ashkelon工厂（位于以色列南部），对絮凝，吸附在动力活性炭（PAC）和超滤（UF）上进行了单独处理和组合处理，以测试市政污水处理产生的二次废水的第三级处理。 130 mg / l FeCl3、0.6 g / l PAC和UF的组合获得了令人鼓舞且可靠的总有机碳（TOC）<3 mg / l的结果。 UF膜对TOC降低的相对贡献随膜的分子量截留值（MWCO）的变化而变化，从100 kDa-MWCO膜的2.9％可以忽略不计，到10 kDa和2 kDa的膜可以达到17％。膜。但是，后面的膜会形成明显的结垢，在过滤周期的前30分钟内通量下降35％。 50 kDa和100 kDa膜的通量下降在约3％的低范围内。絮凝/ PAC预处理的最佳MWCO间隔为20至50kDa，可显着减少有机物含量，同时减少膜污染。详细的GC-MS分析表明，联合处理可非常有效地保留分子量低于800 Da的有机化合物，从而在三次流出物中不存在有害化合物。因此，得出的结论是，推荐的絮凝/吸附规程构成了超滤的有效预处理，并且所获得的第三级废水可用于无限制灌溉。

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