In view of the water quality differences among different water sources(Yellow River reservoir,slightly polluted lakes and rivers),different typical water bodies(Queshan Reservoir,Nanyang Lake and Yihe River)were selected to carry out nanofiltration experiments,and the removal efficiency of inorganic pollutants in different water sources and membrane pollution of NF1 and NF2 nanofiltration membranes were investigated.The results showed that after pretreatment and nanofiltration treatment,the pH value of the three raw water decreased slightly,the turbidity was below 0.186 NTU,and the contents of total hard-ness and dissolved total solids(TDS)were lower.The average removal rate of NF1 and NF2 for univalent ions reached 92.35％and 42.35％,respectively,and the average removal rate for divalent ions reached 97.87％and 85.67％,respectively.After NF2 treatment of raw water from Nanyang Lake,inorganic pol-lution was more serious.The repair effect of acid-base combined washing was better.
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