Pilot-Scale Study And Application Analysis Of Ultrafiltration Membrane To Drinking Water Treatment

At present, most of waterworks in southern China that drinking water treatmentprocess still remain in the conventional treatment process level, only the effectiveremoval of suspended particulate matter, colloids and bacteria; but the increasinglyserious water pollution that allow more and more types of contaminating material,combined with the increasingly stringent drinking water standards, the conventionaldrinking water treatment process is difficult to meet the requirements, most ofconventional process waterworks undertake a significant task of upgrading. Apilot-scale test on treatment Fujiang raw water which has a typical southern waterquality characteristic, basing on conventional treatment process, was carried outultrafiltration membrane replacement V-filter. According to different types of membranemodule, through the comprehensive comparison of membrane pilot plant energyconsumption, drug consumption, running costs and other indicators, then singling outthe better one and providing the necessary technology support to upgrade theconventional process waterworks.In the study, when the influent water was from primary settling tank, results ofanalysis the influent water treated by ultrafiltration membrane showed that the averageremoval rate of the major treated water quality by different types of membrane modulehave the same sequence. The average removal rate of turbidity of the treated water morethan99%and the effluent water quality of ultrafiltration membrane is stable, but theaverage removal efficiency of COD_Mn and UV₂₅₄ is lower. The effluent water treated bydifferent types of membrane module were carried out many times microbiological indexdetect, the results met the new standards for drinking water quality, showed thatultrafiltration water treatment process could ensure the microbiological safety of thetreated water.Comparison and selection of the better performance membrane module in thisstage: first of all, through a group of test by means of orthogonal table, the impactdegree of membrane flux, permeating time, drainage time and cleaning time onmembrane fouling was descend; then, a pilot-scale test on determine the appropriatevalues of different adjustable parameters was carried out, in order to optimizedmembrane flux, permeating time and cleaning time of different types of membranemodule; finally, the water production rate, energy consumption, medicine consumption and membrane depreciation expense of different types of engineering membranemodule were comprehensive comparison based on the previous study, so as todetermine the better performance membrane module for engineering practice.Finally, providing the necessary technology support to upgrade the conventionalprocess waterworks based on the running costs of the pilot-scale, and further estimatingthe water production rate, energy consumption, drug consumption and depreciationcosts of engineering membrane module. On the basis of meeting the new standards fordrinking water quality, the ultrafiltration membrane was selected into the alternativescheme of the conventional process waterworks upgrading. It is proved that themodification scheme not only meet the economic development and water supply statusimprovement of local community, but also provide some referential value for thedesigning and promoting of the ultrafiltration membrane technology in the large ormedium-sized waterworks.