摘要
为了防止氮污染对水体造成的危害，我国对氨氮排放实行严格的控制。采用缺氧－好氧淹没式生物膜脱氮方法研究其处理效果与工艺参数，并着重研究氮负荷和碳源对硝化、反硝化的影响；微生物在膜上的分布特性及其对底质变化的影响。研究结果表明：缺氧段（Ａ段）停留时间为７．３ｈ，好氧段（Ｏ段）为１５．７ｈ好氧段容积负荷：ＣＯＤ０．３６ｋｇ／ｍ３·ｄ，ＮＨ３－Ｎ０．３５ｋｇ／ｍ３·ｄ；缺氧段硝态氮负荷０．６５ｋｇ／ｍ３·ｄ，ＣＯＤ负荷１．７ｋｇ／ｍ３·ｄ。这一水处理技术工艺稳定，ＮＨ３－Ｎ与ＮＯｘ－Ｎ的去除率均在９０％以上，而且生物活性强，分布较均匀，是目前控制氮污染的有效方法。
mmonium-nitrogen discharge has been strictly controlled in our country in order to prevent water body from nitrogen pollution. Therefore,submerged anoxic-aerobic biofilm process for nitrogen removal has been adopted in the study,emphasizing on the treatment performance and technical parameters.Basides,the effect of nitrogen load and carbon source on nitrification and denitrification and the effect of microbial distribution in biofilm on substrate changes have also been studied. It has been shown from the experimental results that the retention time is 7. 3 hours for anoxic stage and 15.7 hours for aerobic stage respectively, in which volumetric loads for aerobic stage are COD 0.36 kg/m3·d and NH3-N 0. 35 kg/m3·d,and nitrate-nitrogen load is 0. 65 kg/m3·d and COD load is 1. 7 kg/m3·d for.the anoxic stage.This process is quite stable with NH3-N and NOx-N removal above 90 per cent and with good microbial activity and uniform distribution,which is an efficient and effective method for the control of nitrogen pollution at present time.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
1995年第2期135-139,共5页
China Environmental Science
关键词
生物膜法
水污染
氮
反硝化作用
biofilm process,denitrification, nitrification.
