净水技术2017，Vol.36Issue(z2)：56-60,117,6.DOI:10.15890/j.cnki.jsjs.2017.s2.014
反硝化前置的序批式高浓度活性污泥法深度脱氮处理C/N偏低的市政污水
High-Efficiency Nitrogen Removal from Low C/N Municipal Wastewater in a Pre-Denitrification Sequencing Batch Bioreactor with High-Concentration Activated Sludge
摘要
Abstract
Low C/N in municipal wastewater normally increases operation difficulty and cost of high-efficiency nitrogen removal,hampers the reuse of treated wastewater and the control of groundwater nitrate pollution,especially in inland water-shortage areas.Performance of a pre-denitrification SBR with iron oxide-promoted high concentration activated sludge for high efficiency nitrogen removal from C/N=4 simulated municipal wastewater was investigated without the use of external carbon and pH regulation.Resuits showed that pre-denitrification coupled to COD removal in hypoxic stage further reduced C/N,reducing the requirement of aera tion in subsequent aeration stage.Compared with single-strong intensity intermittent aeration mode,two-intensity (first weak and then strong) intermittent aeration mode was more effective in limiting the role of heterotrophic aerobic bacteria and their suppressing effects on nitrifying and denitrifying bacteria in aeration stage.As a result,nitrification and denitrification-coupled nitrogen removal could happen to considerable extents,even at the further lowered C/N,overall achieving high efficiency nitrogen removal.At water exchange rates of 30％,40％ and 45％,nitrogen removal efficiencies under two-intensity aeration mode were respectively 71.2％,72.4％ and 70.2％,much better than that of conventional SBR,and volumetric loads of COD were respectively 0.41,0.33,0.29 kg/(m3·d),much better than or equivalent to that of conventional SBR.The levels of ammonia nitrogen and total nitrogen in the effluent all met A-class national discharge standard of municipal sewage.关键词
高浓度活性污泥/前置反硝化SBR/硝化作用/反硝化作用/市政污水Key words
high-concentration activated sludge/pre-denitrification SBR/nitrification/denitrification/municipal wastewater分类
建筑与水利引用本文复制引用
牛明芬,李佳亮,李琪,严群,黄斌..反硝化前置的序批式高浓度活性污泥法深度脱氮处理C/N偏低的市政污水[J].净水技术,2017,36(z2):56-60,117,6.基金项目
国家重点研发计划项目(2017YFD08004) （2017YFD08004）
