Treatment Method For Cadmium(II)-Phenol Co-Contaminated Wastewater And Recovery Method For Its Concentrated Solution

摘要

#$%^&*AU2020100358A420200910.pdf#####Abstract The invention discloses a treatment method for cadmium(II)-phenol co-contaminated wastewater and a recovery method for its concentrated solution. The treatment method comprises the following steps: (1) micelle enhancement: taking cadmium(II)-phenol co-contaminants-containing wastewater as a feed liquid, then adding polyoxyethylene lauryl ether (Brij35) and sodium dodecyl sulfate (SDS) in a molar ratio of 0.05 to 2:1, wherein the molar concentration of SDS is 1 to 3 mmol/L, stirring uniformly, sealing and standing for 3 h; and (2) ultrafiltration: performing ultrafiltration on the feed liquid subjected to micelle enhancement in the step (1) by adopting an external pressure type hollow fiber ultrafiltration membrane assembly at the temperature of 25+5 °C and the operating pressure of 0.05 to 0.09 MPa. The invention also discloses the recovery method for the concentrated solution after the treatment of the cadmium(II)-phenol co-contaminated wastewater. According to the treatment method and the recovery method, the wastewater containing different concentrations of cadmium(II) and phenol co-contaminants could be treated by adjusting the molar ratio of nonionic/anionic surfactants; experiment indicates that cadmium(II) and phenol could be removed simultaneously, the removal rate of cadmium(II) is close to 100%, the removal rate of phenol reaches 93%; and the highest recovery rate of the SDS and Brij35 is 15.44% and 82.4%, respectively.Fig. 100-1 40-~ first extraction w*- second extraction Third extraction 0-0 1000 20 100 3000 mixed surfactant concentration (mgit) Fig.8