Investigation of water purification efficiency and membrane fouling in algae-laden water treated using a combined ceramic membrane process
To assess the water purification efficiency and membrane fouling control of ceramic membrane treatment for algae-laden water,three treatment combinations were employed:direct ultrafiltration(UF),on-line coagulation UF,and air flotation UF.The combined processes exhibi-ted removal efficiencies of(98.77±4.94)％for algal cells,(64.13±6.39)％for DOC,and(96.30±60.36)％for turbidity.The combination of coagulation,air flotation,and ceramic mem-branes enhances the removal efficiency of fluorescent proteins.Through an analysis of the effluent quality from the three combined processes and membrane fouling,it was observed that air flotation disrupted the synergistic effect of algal cells and small molecules of algal organic matter(AOM)on the membrane surface.Air flotation reduced the concentration of algal cells and organic matter in front of the ceramic membrane filtration,hindering the formation of a dense gel layer and mitiga-ting filter cake fouling.Air flotation could reduce the irreversible membrane fouling resistance up to(72.52±4.47)％,which had a significant effect on ceramic membrane fouling.Scanning electron microscopy,fourier infrared spectroscopy,and fluorescence spectroscopy analyses revealed that C=O stretching in proteins,N-H of amines,and C-O of polysaccharides in the amino compounds exerted a significant impact.Following online coagulation and air flotation,the algal cells dispersed sparsely on the surface of the ceramic membrane.The loose structure enhanced the porosity of the filter cake layer,thereby improving the characteristics of the ceramic membrane for water treat-ment and positively contributing to the mitigation of membrane fouling.
Ceramic membraneUltrafiltrationMembrane foulingAir flotationAlgae-laden water
万方数据
维普
