| This thesis aims to evaluate the application feasibility of ultrafiltration (UF)technology in both drinking water purification and advanced treatment of municipalwastewater. A pilot-scale experiment was carried out to investigate the pollutantremoval performance and operation stability at different conditions, and to find outthe optimal operation conditions for both cases. The research results are expected toprovide a technical base for the large-scale engineering application of UF.A long-term test was conducted with the pilot-scale UF equipment for drinkingwater purification. The UF membrane can compeletly remove bacteria and partialorganic matters. As pretreatment of UF, the carbon-sand filtration unit canremove organic matters in the source water, allivate membrand fouling andkeep UF system operate at high flux, which is an effective pretreatment forUF in drinking water purification.The pilot-scale test of UF for advanced treatment of seconday effluent frommucipial wastewater treatment plant was also conducted. The CODCr, BOD5, SS andcolor of the permeate were lower than the national wastewater reuse standard.Periodical backwashing and chemical enhanced backwashing were effective tokeep UF system in steady and long-term operation at high flux. For drinking waterpurification, the flux can be as high as120L/(m2h), with energy consumption as lowas0.07kWh/m3and water recovery rate as high as97.86%; for advanced treatment ofmunicipal wastewater, the flux was as high as70L/(m2h), with energy consumptionof0.10kWh/m3and water recovery rate of93.83%. The analysis of chemicalenhanced backwashing wastewater showed that protein-like substance and fumuswere the main pollutants of UF membrane during drinking water purification.The above results showed that the UF technology performed well in drinkingwater purification and advanced treatment of municipal wastewater, with highmembrane flux and water recovery rate. It has a promising prospect in practicalapplication. |
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