以实际废水和活性污泥为研究对象,通过构建的序批式好氧-缺氧反应器探究不同质量浓度抗生素甲氧苄啶(TMP)对硝化与反硝化过程的影响。结果表明,低质量浓度(如1.0 mg/L)TMP对除碳、脱氮过程无明显影响,而TMP质量浓度超过2.0 mg/L时,降低了碳源消耗及脱氮性能。当进水TMP质量浓度为8.0 mg/L时,稳定时期COD和NH⁺₄-N去除率分别为71.6%~76.5%和75.6%~76.2%,远低于对照组。高质量浓度TMP降低了NH⁺₄-N氧化、NO^-₂-N氧化及NO^-₃-N反硝化,提高了NO^-₂-N的积累并且积累量高达6.5 mg/L,远高于对照组。低质量浓度TMP对硝酸盐还原酶(NAR)的影响不明显。

Taking actual wastewater and activated sludge as the research objects,the effects of trimethoprim (TMP) with different mass concentrations on the nitrification and denitrification processes are investigated by constructing a sequencing batch aerobic anoxic reactor.It is found that TMP with a low mass concentration (such as 1.0 mg·L^-1) has no significant impact on the process of carbon and nitrogen removal,while TMP with a concentration more than 2.0 mg·L^-1 can reduce the consumption of carbon source and the performance in removing nitrogen.When the mass concentration of TMP in influent is 8.0 mg·L^-1,the removal efficiencies of COD and NH⁺₄-N in the stable period are 71.6%-76.5% and 75.6%-76.2%,respectively,far lower than that of the control group.High mass concentration of TMP reduces NH⁺₄-N oxidation,NO^-₂-N oxidation and NO^-₃-N denitrification,and increases the accumulation of NO^-₂-N,which is as high as 6.5 mg·L^-1,much higher than that in the control group.Low mass concentration of TMP has not obvious impact on nitrates reductase (NAR).