A Contrastive Analysis Of Pilot Effect On Bei Jiang Source Water Treated By Different Membrane Module

Currently, there exist prevailing problems of urban and rural drinking water in China,such as poor quality of effluent water, insufficient output etc, which will become increasinglyacute with the worsening of water environment. However, the promulgation andimplementation of Drinking Water Sanitary Standard （GB5749-2006） put forward higherrequirements for drinking water quality. As for the water supply in small towns, it fails tomeet the new standards to some extent, which is inevitably confronted with upgrade theprocess of water supply or substitution with new process. Ultra-filtration （UF） process has thecharacteristic of good effluent water quality, stable operation, short construction period,flexible water supply and so forth. Compared with conventional treatment process, UF isprovided with competitiveness both technologically and economically, which is the mostprobable to replace conventional water treatment process.This thesis mainly aims at analyzing the pilot effect on Bei Jiang source water treated byfour kinds of membrane module（Internal pressure type membrane component, Submergedmembrane component, External pressure type membrane component, Dynamic membranemodule）. a comparative analysis of the effluent quality as well as treatment effect isconducted; its long-term operation effect and stability is explored, which provide technicalassistance for the application of membrane separation technique.This paper compares COD_Mn、turbidity、UV₂₅₄、the total number of bacteria as well astotal coliforms. The results reveal that the effluent quality of four membrane module can meetthe demand of Drinking Water Sanitary Standard （GB5749-2006）. Compared withconventional process, the chosen membrane module has good removal effect of COD_Mnandturbidity, among which conventional process has80.90%removal rate of turbidity and9.7%for COD_Mn.Internal pressure type membrane component owns95.86%of removal rate forturbidity and16.91%for COD_Mn.There are96.09%removal rate on turbidity and17.41%removal rate on COD_Mnof submerged membrane component. There are94.18%removal rateregarding turbidity and13.26%concerning COD_Mngiven by external pressure type membranecomponent. Dynamic membrane module has96.09%removal rate on turbidity and18.33%onCOD_Mn. There is little difference of removal effect on turbidity among four kinds ofmembrane module. As for the removal effect of COD_Mn： Dynamic membranemodule>Submerged membrane component>Internal pressure type membranecomponent>External pressure type membrane component. In this thesis, it is proven thatUV₂₅₄has the best removal effect among four kinds of membrane component （Internalpressure type membrane component has the removal rate of44.29%, Submerged membrane component for43.00%, External pressure type membrane component for49.00%andDynamic membrane module for48.80%）. Which is in accordance with the research conductedby Huang Mingzhu. The results differs from other research results. It might be related to BeiJiang source water quality. The removal effect for bacteria performs good, the total number ofbacteria is lower than100CFU/mL that is in new regulations and there is no proof ofescherichia coli. After operating a year, there is slight change of effluent water quality.Results on the stability of four membrane module reveal that all of them can meet theneed of long-term stability. During the pilot, the rising speed of TMP on Internal pressuretype membrane component is comparatively slow, which lasts127days and TMP rises0.012MPa. Compared with previous type, the membrane flux and TMP of submergedmembrane component decrease after the machine halt for a while. There is obvious bleacheffect for external pressure type membrane component and strong ability of anti-pollution.The membrane flux of dynamic membrane module is big and there is slight pollution onmembrane. It can be known that Internal pressure type is suitable for large and medium-sizedwaterworks and submerged membrane component is suitable for small town and village watersupply. The external pressure type is better for large and medium-sized waterworks which hasbad inflow water quality as well we turbidity. At present, the application of dynamicmembrane module is on experimental stage, but the future is promising.