Advanced Treatment Of Chloramphenicol Wastewater By Adsorption/microwave Ultraviolet Radiation

Adsorption is a common approach in environmental fields and the adsorbed sorbent will become secondary pollutants if discard arbitrarily,then this will pose a threat to the ecological environment; most of the chlorinated organics have biologically toxic and have a more and more threat to the environment.To solve this problem, the microwave-ultraviolet(MW-UV) regeneration active carbon and the dechlorination of chloramphenicol(CAP) was investigated in this study was studied,while adsorbed on the activated carbon to degrade organic chloride.Treated with activated carbon adsorption chloramphenicol, effects of different pretreatments namely acid treatment and alkali treatment, the effects of different p H and initial concentration of chloramphenicol to activated carbon adsorption; and further explore the adsorption mechanism of certain concentration of activated carbon adsorption of chloramphenicol. The data of the experiments showed that Na OH pretreatment of activated carbon can effectively improve the activated carbon adsorption of the CAP;the p H has less impact on the adsorption capacity of the activated carbon; The activated carbon adsorption kinetics model is relatively consistent with the second-order equation, and the adsorption isotherms conform the Freundlich isotherm; The adsorption reaction is exothermic and can spontaneously order.To establish some different factors of the experiment on the microwave UV technology and activated carbon regeneration with the degradation of organic compounds, and the indexes are activated carbon regeneration rate, activated carbon regeneration loss rate, chloramphenicol dechlorination rate.The experiments gave the optimum conditions: air flow rate of 0.028 m3/h, the microwave power was 400 W, irradiation time was 10 min, 6g of amount of the activated carbon. Under the optimum parameters, the activated carbon regeneration rate averaged of 94.97%, CAP dechlorination rate of 85%.Within renewable times of 5, the activated carbon regeneration rate stabilized at an average of more than 95%; with BET, Boehm titration for the characterization methods, under microwave UV system one time,the activated carbon’s specific surface area was 886.695m2/g,and a total pore volume of 0.44215cm3 / g,were respectively 96.11% and 97.05% than the original activated carbon of the total pore volume of the surface area; and after the regeneration of activated carbon,the basic groups changed from 0.1675 mmol / g to 0.4230 mmol / g; the activated carbon adsorption regeneration after five still complex Freundlich isotherm model.Under the optimum conditions, chloramphenicol degardes in a separate microwave system, the CAP dechlorination rate is 63.84 percent, an average of 4.69% salinity, while in the MW/UV system, the CAP dechlorination rate is 83.32 percent, and the degree of mineralization was 37.51%.Using microwave radiation technology coupling UV to treat the industrial wastewater for 10 sets of parallel tests treated under the optimum parameters,the experiments concluded that under the MW/UV, activated carbon regeneration rate of 116.15 percent on average and under MW conditions for 66.86%; average degree of mineralization MW / UV system was 26.43%,and lower rate under MW was only 2.77 percent; After treating,the COD of the wastewater is 64.70mg/L <300mg/L, reach the national standard for pharmaceutical wastewater treatment requirements.