【摘要】 针对低C/N比污水脱氮的难点问题,在缺氧段不同点设置进水口,采用分点进水A/O工艺处理校园生活污水。考察了在污泥回流比为100%,硝化液回流比为200%,分流比为1∶1,缺氧池水力停留时间(HRT)分别为2、2.4和3 h情况下,分点进水A/O工艺的反硝化性能,并与传统的A/O工艺进行比较。结果表明,当缺氧池的水力停留时间为3 h时,工艺达到最佳脱氮效果。在平均进水COD、氨氮、TN分别为302 mg/L、58.64 mg/L和64.26 mg/L时,出水COD、氨氮、TN分别为30 mg/L、0.09 mg/L和28.64 mg/L,去除率分别为89.94%、99.85%和56.40%,处理效果优于传统的A/O工艺。更多还原

【Abstract】 Aimed at the difficulty in biological nitrogen removal from low C/N wastewater,the lab-scale step-feed biological nitrogen removal A/O process was used to treat campus sewage,by setting influent points on different sections of the anoxic tank.Denitrification efficiency of step-feed biological nitrogen removal A/O process was investigated under the conditions of sludge reflux ratio of 100%,nitrification liquid reflux ratio of 200% and hydraulic retention time of anoxic tank 2 h,2.4 h,3 h,compared with the conventional A/O process.The results show that process will reach the best removal effect when hydraulic retention time(HRT) is three hours.The average concentrations of the COD,ammonia and TN are separately reduced from 302 mg/L,58.64 mg/L and 64.26 mg/L to 30 mg/L,0.09 mg/L and 28.64 mg/L,and the removal efficiencies of COD,ammonia and TN are 89.20%,99.85% and 56.40%,respectively,which indicate that the treatment effect of the step-feed biological nitrogen removal A/O process is better than that of traditional biological nitrogen removal A/O process.更多还原