The combination process of"Fe/C microelectrolysis+neutralization flocculation precipitation+electrodialysis"was used to treat high salt hydroxypropyl methylcellulose production wastewater in stages.Under the optimized conditions,the COD removal rate of"Fe/C microelectrolysis+neutralization flocculation precipitation"reached 35％,the BOD5/COD increased from 0.1 to 0.31,and the weight percentage of salt was still as high as 3％,with the electrical conductivity of 60.81 mS/cm.Electrodialysis of the supernatant after precipitation,the mass concentration of salt in the fresh room and the conductivity can be reduced to less than 5 g/L and 0.25 mS/cm respectively,the COD removal rate reaches 14.2％,the effluent meets the requirements of biochemical treatment,and the mass concentration of salt in the concentrated water can be increased to 150 g/L.The process realizes the effective pre-treatment of high salt wastewater,and provides a new way of thinking for the discharge to meet the standards.
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