缺氧-好氧生物工艺对土霉素的降解行为研究

Study on Degradation of Oxytetracycline by Anoxic-Aerobic Process

采用缺氧-好氧(A/O)生物工艺对养猪废水中高含量的COD、NH_4^+-N和土霉素(OTC)进行降解实验研究。结果表明,驯化完成后,A/O工艺对养猪废水中COD和NH_4^+-N的去除率分别达到93%和81%以上。当养猪废水中OTC投加质量浓度分别达到0.1 mg/L和1 mg/L时,缺氧池对OTC的去除率分别达到73%~81%和94%~97%,好氧池仅为6.2%~16.1%和1.1%~2.8%,这说明缺氧微生物降解是OTC去除的主要途径。同时,进水中质量浓度0.1 mg/L的OTC对A/O生物工艺的运行没有任何影响,而进水中质量浓度1 mg/L的OTC能够显著地抑制硝化反应和反硝化反应,但是2种含量的OTC对COD去除没有任何影响。

The biodegradation of high concentration of COD, NH4＋-N and oxytetracycline （OTC） by anoxic-aerobic process （A/O） in piggery wastewater was studied in this paper. The results showed that, after domestication completed, the removal rate of COD and NH4＋-N by A/O process in piggery wastewater were above 93% and 81%, respectively. When the biological system was added with 0.1 and 1 mg/L mass concentration of OTC, the removal rate of OTC in anoxic tank were 73%-81% and 94%-97%, respectively, while the removal rate of aerobic tank were 6.2%-16.1% and 1.1%-2.8%, respectively. It demonstrated the biodegradation of OTC by anoxic microorganisms could be the principal pathway. And when the mass concentration of OTC was 0.1 mg/L in influent, it had no effect on the operation of A/O bioprocessing, but the concentration increased to 1 mg/L, the nitrification and denitrification were clearly affected. And both of these concentration had no effect on COD removal.