外加剩余污泥水解酸化液碳源时曝气生物滤池的生物脱氮性能

利用剩余污泥水解酸化液作为外加碳源研究中部曝气和底部曝气曝气生物滤池(BAF)处理低碳氮比生活污水时的生物脱氮性能。结果表明,碳源与污水投配的流量比以及是否回流对BAF生物脱氮效果影响明显,气水流量比和回流流量比对BAF生物脱氮效果有一定影响;进水NH4+-N、TN质量浓度和COD分别为43.11、45.07、29.2mg.L-1时,中部曝气BAF的NH4+-N和TN去除率分别为99.04%和78.32%,出水COD为32.4 mg.L-1;底部曝气BAF的NH4+-N和TN去除率分别为98.61%和68.99%,出水COD为28.4 mg.L-1。研究表明,BAF在2种运行方式下可获得良好的硝化与反硝化性能,且不会引起二次污染。

BIOLOGICAL NITROGEN REMOVAL PERFORMANCES OF BIOLOGICAL AERATED FILTER WITH HYDROLYSIS-ACIDIFICATION LIQUOR OF EXCESS SLUDGE AS ADDITIONAL CARBON SOURCE

Biological nitrogen removal performances of the biological aerated filter(BAF) under mid-aeration mode and bottom-aeration mode,respectively,for the treatment of low C/N ratio domestic sewage were studied when the hydrolysis-acidification liquor of excess sludge was used as the additional carbon source.The results showed that the flow ratio of carbon source to influent and whether the recirculation was adopted had obvious influences on the biological nitrogen removal performances,and the air/water ratio and the recirculation ratio had influences to some extent.When the influent NH4+-N、TN and COD were 43.11 mg·L-1、45.07 mg·L-1 and 29.2 mg·L-1,respectively,NH4+-N and TN removal rates could reach 99.04% and 78.32%,respectively,and the effluent COD was 32.4 mg·L-1 for the BAF with mid-aeration mode.In the meantime NH4+-N and TN removal rates could reach 98.61% and 68.99%,respectively,and the effluent COD was 28.4 mg·L-1 for the BAF with bottom-aeration mode.This research indicated that good nitrification and denitrification performances could be obtained for BAF under two operation modes,and the second pollution could not be caused.