催化臭氧氧化法处理模拟海产养殖尾水中四环素的研究

Study on the treatment of tetracycline in simulated marine aquaculture tail water by catalytic ozone oxidation method

四环素(tetracycline,TC)被广泛运用于海产养殖业中,TC的过量投加会导致其在养殖尾水中残留,使用常规方法难以去除。本文采用催化臭氧氧化技术对模拟海产养殖尾水中的TC进行降解,并进行多角度的数据分析,证明技术的可行性。实验结果表明:以A-Mn/CeO-γAl_(2)O_(3)为催化剂的催化臭氧反应体系中,臭氧浓度和催化剂投加量的增加可提升TC的去除率。最佳反应工艺条件为:臭氧浓度4.46 mg/L,催化剂投加量186.67 g,反应时间不低于3.27 min。模拟尾水中的TOC反应1 h后去除率为71.6%。腐殖酸、富里酸类有机物可被反应体系快速去除。TC在反应体系中经历分子重排等反应后转变为CO_(2)和H_(2)O,反应结束后模拟尾水的生物毒性降低。

Tetracycline(TC)has been widely used in the marine aquaculture industry. However, overdosing TC can lead to the residue that is difficult to be removed by conventional methods in the tail water. This paper used catalytic ozone oxidation technology to degrade TC in simulated marine aquaculture tail water, and analyzed the data in multi-angle to prove the feasibility of this technology. Results of the experiment showed as follow: in the catalytic ozone reaction system that using A-Mn/CeO-γAl_(2)O_(3) as the catalyst, the TC removal rate increased with the increase dosage of ozone and catalyst. Ozone 4.46 mg/L, catalyst 186.67 g and reaction time not less than 3.27 minutes were the optimum reaction conditions. The removal rate of TOC in simulated tail water was 71.6% after 1 hour reaction. The organics of humic acid and fulvic acid could be quickly removed by the reaction system. TC was transformed into CO_(2) and H_(2)O after reactions including molecular rearrangement in the reaction system. TC was transformed into CO_(2) and H_(2)O, and the biological toxicity of simulated tail water was reduced after reaction.