| Summary: | 碩士 === 中原大學 === 生物環境工程研究所 === 103 === Nowadays,treatment program of membrane is the choice for industrial, municipal water and wastewater treatment with wide using, Permanent flux decline, loss of product quality, affecting water quality, and reduce the life of film are the main problem because of membrane fouling accumulation with long operating time.
Literature shows that nano-materials with photocatalyst coating and coat on membrane surface can enhance hydrophilicity and reduce effect of fouling. In this study, PVDF membrane was reformed by low-temperature plasma modification and coated with N-doped ZnO on PVDF membrane. Change characteristics of membrane surface and Minimize fouling effects and remove them.
In experiment of adding dose, shows that photocatalytic degradation of efficiency tend to be slower after add more than 0.5g of N-doped ZnO; In experiments of different Reactive Black 5(RB5) initial concentrations shows that RB5 concentration of is higher, visible light transmittance is lower. After N-doped ZnO coating on the membrane, the efficiency of photocatalytic degradation RB5 obviously reduced, but still has capacity of photocatalysis.
In the experiment of the simulation of pollutant membrane fouling that chooses amount of coating for 0.25g, 0.5g, 1g with N-doped ZnO membrane to operate. In alginic acid placing, unmodified PVDF films still in fouling state in the end, the highest recovery rate is coated 0.5g of N-doped ZnO membrane that can reach to 96% of water flux test. In bovine serum albumin placing, unmodified PVDF and coating with membrane of 0.25g of N-doped ZnO still in fouling state in the end, the highest recovery rate is coated 1G of N-doped ZnO membrane that can reach to 85% of water flux test. In the activated sludge test, recovery rate in Physical cleaning stage of all the N-doped ZnO flux are better than PVDF membrane and recover to the initial flux in illumination satge. It shows that N-doped ZnO has certain efficiency on different kinds of antifouling, the flux recovery of N-doped ZnO membrane in different pollutants accumulated can reach more than 80% after light for 60 minutes.
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