Dyeing wastewater reuse by means of microfiltration-reverse osmosis combined process

Pretreatment process including micro-flocculation filtration,disinfection and microfiltration,together with the dense water reflux RO system is carried out to reuse the dyeing wastewater,the desalination effect and operation conditions are optimized.The results show that the combination of pretreatment and dense water reflux RO(reverse osmosis) system can effectively remove the total hardness,Cl-,SO42-,Na+ over 90%,95%,90%,95% respectively;the conductance of the RO effluent is lower than 150μS/cm;the desalination rate is over 95%.The system operates steadily and economically.