前置反硝化BAF工艺处理景观水体

为了提高曝气生物滤池(BAF)对景观水体的脱氮效果,开发了前置反硝化BAF工艺,考察了其对景观水体的处理效果及影响因素,并与传统BAF工艺作比较。结果表明,前置反硝化BAF工艺对TN和浊度的去除效果明显优于传统BAF工艺,前者对TN和浊度的平均去除率分别为45%和88%,而后者的分别为30%和47%;两种工艺对COD和氨氮的去除效果相近,但前置反硝化BAF工艺的出水水质更稳定;对于前置反硝化BAF工艺,当水力负荷为1.42~4.95 m/h时,对COD、氨氮和TN的去除率均随水力负荷的增加而降低;在水力负荷为2.12 m/h的条件下,回流比对COD和氨氮的去除效果影响不大,但对TN的去除率随回流比的增加呈先升高后降低的趋势,最佳回流比为1.5∶1;另外,对TN的去除率随进水C/N值的增加而升高,当C/N6时,系统的脱氮效果较好。

Treatment of Landscape Water by Pre-denitrification Biological Aerated Filter

In order to improve the removal efficiency of nitrogen from landscape water by biological aerated filter (BAF), the pre-denitfification BAF process was developed.The treatment efficiency of landscape water and the influence factors were investigated, and the pre-denitrification BAF was com-pared with traditional BAF.The results indicate that the removal efficiencies of TN and turbidity by the pre-denitrification BAF are better than those by traditional BAF.The removal rates of TN and turbidity by the pre-denitrification BAF and traditional BAF are 45%, 88% and 30%, 47% respectively.The re-moval efficiencies of COD and ammonia nitrogen by two kinds of processes are similar, hut the effluent quality of the pre-denitrification BAF is more stable.For the pre-denitrification BAF, when the hydraulic load is 1.42 to 4.95 m/h, the removal rates of COD, ammonia nitrogen and tiN decrease with the hy-draulic load increasing.When the hydraulic load is 2.12 m/h, the return ratio has little effect on the re-moval of COD and ammonia nitrogen, but the removal rate of TN increases first and then decreases with the return ratio increasing, and the optimal return ratio is 1.5 : 1.In addition, the removal rate of TN in-creases with increasing of the influent C/N ratio.When the C/N ratio exceeds 6, the nitrogen removal ef-ficiency of the system is better.