Study on application of spray-drying method in inorganic salt recovery and organic matter decomposition in high salt organic wastewater
In this study,the spray-drying process was used to treat dissolved organic pollutants and inorganic salts in high-salt organic wastewater.The recovery of inorganic salts and the decomposition properties of organic matter at each tempera-ture of the process were revealed.The analysis results of the product powder by SEM,FT-IR and 3D-EEMs showed that dur-ing the heating and evaporation process in the atomization chamber,macromolecular refractory substances such as humic acid containing hydrophilic groups(hydroxyl and dcarbonyl groups)combined with inorganic salts such as NaCl and Na2SO4 to form open hollow spherical shell structure particles.The particle size of the powder was distributed between 1.25 and 3.85 μm.After spray-drying and cyclone separation,white powders were obtained from wastewater,which was burned at 600℃,all the refractory organic matter in it could be completely removed,and the burning loss rate was 6.23%.AAs and XRD analysis of the burned mixed salt showed that most of the metal elements such as Na+and K+in the original wastewater were reserved for further recycling after salt separation.Under the optimal process conditions(0.2 MPa+140℃),the decom-position and transformation efficiency of organic matter was as high as 93.1%,and the degradation rate of eutrophication pollutants such as dissolved organic carbon,ammonia nitrogen,total nitrogen and total phosphorus in water was over 64.7%,the total recovery rate of inorganic salt was 87.2%,which provided a new idea for the comprehensive disposal and clean uti-lization of high-salt wastewater.
spray-drying processhigh-salt organic wastewaterorganic matter decompositioninorganic salt recovery
万方数据
维普
