Study On Advanced Treatment Of Pharmaceutica Wastewater

Pharmaceutical wastewater, as one of the major industrial wastewater at present, is akind of non-biodegradable and high concentrated organic wastewater and attracts widespreadattention because of its toxicity, hazard, hard biodegradation. In recent years, large number ofnew drugs are being developed and put into production as the pharmaceutical science andtechnology continually progress, however, at the same time many kinds of complex organiccompound are discharged into the pharmaceutical wastewater which complicate the content ofthe wastewater and make the wastewater treatment more and more difficult. Moreover, thepharmaceutical industry wastewater emission standard continues to improve on account of thepublic awareness about ecological environment protecting and pollution reducing isimproving, the country is pushing energy saving and emission reduction constantly too. Thepharmaceutical wastewater treatment process mainly bases on biological treatment could notmeet the emissions standards anymore. Study out a practical and efficient advanced treatmentprocess to ensure that pharmaceutical wastewater meet the emission standards is imminent.This study used a large pharmaceutical company in Zhuhai, Guangdong Province as theresearch object. A BAF system was used for advanced treatment of the effluent from"preprocessing–anaerobic–aerobic" process which was used as conventional biologicaltreatment originally, but effluent of the original advanced treatment failed to meet thestandards because of the limits of its conditions and the improvement of emission standards.This study puts forward the “Fenton advanced chemical oxidation–BAF” union process forthe advanced treatment process of the effluent based on adequate research into variousdomestic and international pharmaceutical wastewater advanced treatment technology.Different factors of the degradation of pharmaceutical wastewater treatment were studied bylaboratory experiments. It is found that under the optimal conditions, the COD and chromaremoval efficiency of the final effluent is greater than75%and90%. Operating costs of thisprocess is about3.21yuan/t, which is lower than the general advanced oxidation processes.The main component of pharmaceutical wastewater was determined by analyticalmethod like GC-MS, HPLC, etc.21kinds of organic pollutants were detected in the influentand12kinds in the effluent as well. It was found that thiazoles, aniline and other reactionsintermediates with benzene ring and a heterocyclic structure were the main non-biodegradableorganics. Phthalate acid was chosen as the feature phthalate contaminants in this study. Theresults indicated that the wastewater could be effectively degraded under similar conditions ofactual pharmaceutical wastewater Fenton oxidation, which ensure that the advanced treatment processes can operate successfully.According to experimental results,“CASS biochemical effluent–Fenton reaction tower–Fenton reaction tank–Fenton sedimentation tank–Fenton intermediate tank–BAF–cleanwater tank–effluent” is determine as the specific process for the actual wastewater advancedtreatment transformation project. The costs of the system operation is about5.48yuan/m~3.The project will achieve more than300tons COD reduction per year, and will have obviousbenefits to the local ecological environmental protection and social development.