Fouling analysis of Liaoning a seawater desalination system reverse osmosis membrane
Membrane fouling has become a major problem hindering the normal operation of seawater desalination reverse osmosis system,a nuclear power plant in Liaoning,seawater desalination system of the primary reverse osmosis water production decreased,initially determined that the primary reverse osmosis membrane fouling blockage,and the chemical cleaning effect is poor effect.To analyze the main causes of the fouling characteristics,this study selected an RO membrane module at the water production end of the primary reverse osmosis system of the nuclear power plant for autopsy and analyzed it comprehensively from the physicochemical and biological perspectives.FESEM analysis revealed that particles were embedded in the amorphous matrix fouling layer,and microorganisms and biofilm structures were visible on the surface.EDS detected that the main elements in the fouled layer were C,N,and O,in addition to a small amount of Al,Na,and Ca,and analyzed that the fouling was predominantly biological and organic,and that aluminum salts could react with scale inhibitors to form a colloidal precipitate,which was in agreement with the results of colloidal fouling observed by SEM.FTIR analysis was performed to analyze the fouling in the RO membrane module.FTIR further confirmed that the fouling layer was mainly polysaccharides,proteins,and other biological metabolites,which coincided with the biofouling results observed by SEM.Further characterization of the biofouling in combination with culturable techniques identified the dominant bacterial groups as Bacillus and Pseudomonas,both of which are associated with reverse osmosis membrane fouling.The research can provide reference for biofouling control of seawater desalination system,it is suggested that the sterilization of Bacillus and Pseudomonas be carried out,and the kinds and dosages of bactericide,flocculant and reductant be adjusted.
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