Secondary effluent including different kinds of foulants, e.g. extracellar polymeric substances (EPS), soluble microbial products (SMP), and humic acids was considered as a major barrier for wastewater reuse and reclamation when a membrane was applied to obtain high quality treated water. A new hybrid system of photocatalytic oxidation and non-woven membrane separation was studied for treating secondary effluent. Initially, the foulant properties, such as polysaccharide, protein, and biopolymer, etc., were examined in a batch test. The experimental results revealed that foulants in secondary effluent could be photodegraded. Then, a continuous experiment with this new hybrid system, three applied fluxes of 16.6, 33.3, and 50.0 L/m(2) A (LMH), was applied to investigate the photodegradation ability and the filtration behavior. The results revealed that the concentration of foulants in permeate increased with increasing applied flux, due to the reduction of hydraulic retention time (HRT). In comparison with the system using microfiltration (MF) or ultrafiltration (UF) membrane, larger specific flux was obtained in our non-woven membrane system. In addition, a batch-stirred cell test using UF membrane was performed to compare filtration performance before and after photodegradation in secondary effluent. Such results proved that this new hybrid system was an effective treatment process for foulant removal in secondary effluent.
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机译:次要废水,包括不同种类的污垢,例如当使用膜获得高质量的处理水时,细胞外聚合物(EPS),可溶性微生物产品(SMP)和腐殖酸被认为是废水回用和再生的主要障碍。研究了一种新的光催化氧化与非织造膜分离混合系统,用于处理二次废水。最初,在分批测试中检查了诸如多糖,蛋白质和生物聚合物等的污垢特性。实验结果表明,二级废水中的污垢可以被光降解。然后,使用此新的混合系统进行的连续实验,分别应用了三种分别施加的通量16.6、33.3和50.0 L / m(2)A(LMH),以研究其光降解能力和过滤行为。结果表明,由于水力停留时间(HRT)的减少,渗透液中污染物的浓度随施加的通量的增加而增加。与使用微滤(MF)或超滤(UF)膜的系统相比,在我们的非织造膜系统中获得了更大的比通量。另外,进行了使用超滤膜的间歇搅拌池测试,以比较二次废水中光降解前后的过滤性能。这些结果证明,这种新的混合系统是去除次级污水中污垢的有效处理方法。
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