催化臭氧氧化去除模拟海产养殖废水中氟苯尼考

REMOVAL OF FLORFENICOL FROM SIMULATED MARINE AQUACULTURE WASTEWATER BY CATALYTIC OZONATION

氟苯尼考(Florfenicol,FF)是海产养殖中应用的一种抗生素。但是,残留的FF用常规方法难以去除,导致海水污染。以负载Mn-Ce氧化物的γ-Al2O3为催化剂,采用催化臭氧氧化技术去除模拟海产养殖废水中的FF,考察了臭氧浓度、催化剂用量等工艺参数以及海水中高锰酸钾指数(CODMn)和氨氮浓度对FF去除率的影响。运用液相色谱-质谱(LC-MS)联用技术对FF降解中间产物进行定性分析以确定FF的降解途径,并对处理前后的废水进行生物毒性研究。研究结果表明:Mn-CeOx/γ-Al2O3催化体系中臭氧浓度为12.86 mg/L,催化剂投加量为200 g,初始ρ(FF)为25mg/L,反应20 min,FF去除率可接近100%;随着CODMn和氨氮浓度的增加,会使FF去除率降低;经Mn-CeOx/γ-Al2O3催化臭氧氧化,FF最终转化为CO2和H2O,废水的生物毒性得到有效下降。

Florfenicol(florfenicol,FF)was an antibiotic used in marine aquaculture.However,the residual FF,which would lead to seawater pollution,was difficult to remove by conventional methods.In this study,FF in molded marine aquaculture wastewater was removed by catalytic ozonation usingγ-Al2O3 loaded with Mn-Ce oxide(Mn-CeOx/γ-Al2O3)as the catalyst.The effects of process parameters such as ozone concentration and catalyst dosage,CODMn and ammonia nitrogen concentration,on the removal rate of FF were investigated.In order to deduce the degradation pathway of FF,qualitative analysis of FF degradation intermediates in Mn-CeOx/γ-Al2O3 catalytic system was carried out by LC-MS technique.At the same time,the bio-toxicity of seawater before and after processing was also carried out.The experimental results showed that the concentration of ozone in the Mn-CeOx/γ-Al2O3 catalytic system was 12.86 mg/L,the dosage of the catalyst was 200 g,the initial concentration of FF was 25 mg/L,and the reaction rate was 20 min,then the removal rate of FF was nearly 100%;the increasing of CODMn and ammonia nitrogen concentration reduced FF removal efficiency;the biological toxicity of wastewater was reduced due to the thoroughly degradation of FF after the process of catalytic ozonation.