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Research on Membrane Fouling Control Technology of Enhanced Coagulation-ultra Filtration System

Author: ZhouXuZhi
Tutor: ChuYongBao
School: Qingdao University of Science and Technology
Course: Environmental Science
Keywords: Enhanced coagulation Ultrafiltration PAC-JY01 Membrane fouling mechanism
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 87
Quote: 1
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Abstract


\In this paper, kaolin - humic acid simulated water samples for the study, the screening eight flocculant study the coagulation process of membrane performance by comparing the different coagulation process effluent quality and ultrafiltration water quality , and preliminary study of membrane fouling mechanism. The study shows : the best conditions of the PAC- the JY01 single coagulation and coagulation - ultrafiltration combined with optimum coagulation process conditions is consistent with the best dosage of 3mg / L , the optimum pH = 6 . Under optimal conditions , the UV 254 and turbidity removal efficiency were 79.30% and 99.70% . Dosage of 0.5 and 8 mg / L, coagulation turbidity removal efficiency is poor , especially dose of 8mg / L back to muddy flow becomes positive potential , the membrane fouling . Changes in ionic strength of the impact on the coagulation results not very big, but will change the particle size distribution of the particles , thus affecting the ultrafiltration membrane . The ionic strength of 0.05mmol / L and 0.25mmol / L Coagulation supernatant particle size distribution of between 1-10μm ; ionic strength as the particle size of 0.15 mmol / L of the coagulation supernatant mainly distributed in about 100μm , then the film is minimal contamination . UV 254 removal increases dramatically with the increase in hardness . Which CaCl 2 concentration 8mmol / L , UV 254 < / sub> removal efficiency of 86.67% , than not added Ca 2 < / sup > when the processing of the raw water Fortunately, the solution conducive to the removal of organic matter containing a small amount of Ca 2 . With the increase in the hardness of the raw water , the membrane flux decline sequentially . CaCl 2 concentration of 1mmol / L , the particle diameter distribution between 1-10μm , the membrane flux decline fastest . Three kinds of flocculants the AlCl 3 , PAC and PAC-JY01 comparative study shows that the the AlCl 3 pollution film most serious fastest decline in membrane flux ; PAC generated floc average median particle size is the smallest , the shear crushing capacity is the strongest , but poor it broken resilience ; PAC - JY01 -generated , floc size , floc broken recovery capability is also very , and after the resumption of the median diameter of the highest membrane flux smallest decrease .

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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