Advanced treatment of antibiotic pharmaceutical wastewater by catalytic ozonation combined with BAF process
HE Jinyao1,2,, WEI Jian2, ZHANG Jiawen1,2, LIU Xueyu2, SONG Yonghui1,2,,, YANG Dazhuang3, WANG Jian1 1.College of Environmental Sciences, Liaoning University, Shenyang 110036, China 2.Department of Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China 3.Beijing Construction Engineering Group Environmental Remediation Co. Ltd., Beijing 100015, China
Abstract:In view of the complex, toxic and difficult biodegradation of antibiotic pharmaceutical wastewater, the Ce-loaded natural zeolite was used as a catalyst (Ce/NZ), and the ozone-catalyzed biological aerated filter (BAF) combination process was applied to advanced treatment of the secondary biochemical treatment effluent of antibiotic pharmaceutical wastewater. The results showed that the Ce/NZ catalyst could significantly improve the treatment efficiency of the ozone pretreatment unit. With the ozone inlet concentration of 50 mg·L?1, the ozone intake of 600 mL·min?1, the catalyst dosage of 1 g·L?1 and the ozone reaction time of 120 min, the COD removal rate of antibiotic pharmaceutical wastewater reached 43%, the average COD value was reduced from 220 mg·L?1 to 125 mg·L?1, and the BOD5/COD increased from 0.12 to 0.28, during which the biodegradability of wastewater was significantly improved. The effluent of the ozone pretreatment unit was biochemically treated by BAF. At average influent COD value of 125 mg·L?1, the average influent ${\rm{NH}}_4^{+} $-N concentration of 12 mg·L?1, the hydraulic retention time of 4 h, and the gas to water ratio of 4∶1, the average removal rates of COD and ${\rm{NH}}_4^{+} $-N were 62% and 64%, respectively. After the combined process treatment, the average concentrations of COD and ${\rm{NH}}_4^{+} $-N in the effluent were 46 mg·L?1 and 4.1 mg·L?1, respectively, and the effluent water quality could stably meet the Discharge Standards of Water pollutants for Pharmaceutical Industry Fermentation Products Category (GB 21903-2008). Compared with the BAF process alone, the average removal rates of COD and ${\rm{NH}}_4^{+} $-N in the effluent of combined process increased by 66% and 15%, respectively, and the effluent quality was significantly better than that of the BAF process alone. Key words:pharmaceutical wastewater/ catalysis/ ozonation/ biological aerated filter/ advanced treatment.
图1臭氧催化氧化-BAF组合工艺装置示意图 Figure1.Schematic diagram of catalytic ozonation -BAF process
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1.College of Environmental Sciences, Liaoning University, Shenyang 110036, China 2.Department of Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China 3.Beijing Construction Engineering Group Environmental Remediation Co. Ltd., Beijing 100015, China Received Date: 2019-02-15 Accepted Date: 2019-04-08 Available Online: 2019-10-11 Keywords:pharmaceutical wastewater/ catalysis/ ozonation/ biological aerated filter/ advanced treatment Abstract:In view of the complex, toxic and difficult biodegradation of antibiotic pharmaceutical wastewater, the Ce-loaded natural zeolite was used as a catalyst (Ce/NZ), and the ozone-catalyzed biological aerated filter (BAF) combination process was applied to advanced treatment of the secondary biochemical treatment effluent of antibiotic pharmaceutical wastewater. The results showed that the Ce/NZ catalyst could significantly improve the treatment efficiency of the ozone pretreatment unit. With the ozone inlet concentration of 50 mg·L?1, the ozone intake of 600 mL·min?1, the catalyst dosage of 1 g·L?1 and the ozone reaction time of 120 min, the COD removal rate of antibiotic pharmaceutical wastewater reached 43%, the average COD value was reduced from 220 mg·L?1 to 125 mg·L?1, and the BOD5/COD increased from 0.12 to 0.28, during which the biodegradability of wastewater was significantly improved. The effluent of the ozone pretreatment unit was biochemically treated by BAF. At average influent COD value of 125 mg·L?1, the average influent ${\rm{NH}}_4^{+} $-N concentration of 12 mg·L?1, the hydraulic retention time of 4 h, and the gas to water ratio of 4∶1, the average removal rates of COD and ${\rm{NH}}_4^{+} $-N were 62% and 64%, respectively. After the combined process treatment, the average concentrations of COD and ${\rm{NH}}_4^{+} $-N in the effluent were 46 mg·L?1 and 4.1 mg·L?1, respectively, and the effluent water quality could stably meet the Discharge Standards of Water pollutants for Pharmaceutical Industry Fermentation Products Category (GB 21903-2008). Compared with the BAF process alone, the average removal rates of COD and ${\rm{NH}}_4^{+} $-N in the effluent of combined process increased by 66% and 15%, respectively, and the effluent quality was significantly better than that of the BAF process alone.
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