Study of reverse osmosis membranes fouling by inorganic salts and colloidal particles during seawater desalination  

作　　者：Santiago Gutiérrez Ruiz Juan Antonio López-Ramírez Mohammed Hassani Zerrouk Agata Egea-Corbacho Lopera JoséMaría Quiroga Alonso 

机构地区：[1]Department of Environmental Technologies,Faculty of Marine and Environmental Sciences,University of Cadiz,11510,Puerto Real,Cadiz,Spain

出　　处：《Chinese Journal of Chemical Engineering》2020年第3期733-742,共10页中国化学工程学报（英文版）

基　　金：funded by the Project AM11/04 of the Junta de Andalucía(Spain)。

摘　　要：Fouling phenomenon is considered among the major reasons that cause significant increase of operating cost of desalination plants equipped with reverse osmosis(RO)membranes.This phenomenon is studied in the present work in the case of RO polyamide aromatic membranes using model seawater containing inorganic salts and colloidal compounds.Different solubility conditions of CaCO3 and CaSO4 were applied to study RO performances with and without colloid presence.During experiments,the membrane permeate fluxes were continuously monitored.Moreover,studies of chemical composition,structure,and morphology of the materials deposited on the membrane surface were conducted using energy dispersive microanalysis(EDS)X-ray diffraction and scanning electronic microscopy(SEM).Results show that in conditions of calcium carbonate oversaturation there is a reduction in the permeate flow of 11.2%due to fouling of the membrane by the precipitation of this compound.While in the same conditions of calcium sulphate oversaturation the reduction of the flow is 5%,so we can conclude that in conditions of oversaturation of both salts,calcium carbonate produces a greater fouling of the membrane that in its view causes greater decrease in the flow of permeate.All this based on the results of the test with both salts in oversaturated conditions.Resulting in the formation of calcite and gypsum crystals onto the membranes as XRD analyses stated.Additional presence of colloidal silica in those conditions intensifies strongly the fouling,leading until to 24.1%of permeate flux decrease.

关 键 词：Reverse osmosis DESALINATION FOULING Seawater SCALING 

分 类 号：P747[天文地球—海洋科学] TQ028.8[化学工程]