碳氮比对UniFed SBR工艺性能的影响  

Effects of Influent C/N Ratio on Performance of UniFed SBR Process

作　　者：赵晨红[1] 彭永臻[1] 王淑莹[1] 唐旭光[1] 

机构地区：[1]北京工业大学水质科学与水环境恢复工程重点实验室,北京100022

出　　处：《环境科学》2008年第5期1210-1215,共6页Environmental Science

基　　金：国家'十一五'科技支撑计划重点项目(2006BAC19B03);北京市属市管高等学校人才强教'创新团队'项目

摘　　要：采用UniFed SBR工艺试验装置处理实际生活污水,考察了7组不同的进水碳氮比(2.75、4.28、5.7、6.5、6.97、8.08、11.19)对总氮、磷和COD去除以及污泥沉降性能的影响.结果表明,当C/N低于5.7时,TN去除率随C/N的升高而快速大幅度提高,从2.75时的43.6%升至5.7时的80.84%,之后继续提高C/N,由于不能进一步提高进水/排水阶段的脱氮率,只能提高曝气阶段由于同步硝化反硝化产生的脱氮率,所以TN去除率的提高变得缓慢.随着进水C/N的增加,聚磷菌可从进水中获得更多的有机碳源,进行PHB的合成和PO43-的释放,同时避免了NOx-对释磷产生的抑制作用,因而磷的去除率随C/N的增加而提高,且C/N越高,PAOs的释磷量和吸磷量越多,好氧吸磷速率越快,除磷效果越好.进水C/N的变化对COD的去除没有显著影响,平均去除率为93.15%.当C/N大于6.97、有机负荷高于0.38 kg/(kg.d)时,污泥容积指数随C/N的增加而大幅度提高,产生由于低溶解氧和高负荷带来的非丝状菌污泥膨胀.The effects of 7 groups of different influent C/N ratio （2.75,4.28,5.7,6.5,6.97,8.08,11.19 ） on the removal efficiencies of total nitrogen, phosphorus and COD as well as the sludge settling performance were investigated in a UniFed SBR lab-scale apparatus treating actual domestic wastewater. The results showed that when the C/N ratio was lower than 5.7, TN removal efficiency increased sharply as C/N ratio increased, from 43.6% of 2.75 to 80.84% of 517. Afterwards, TN removal efficiency increased very slowly as C/N ratio increased, because only TN removal efficiency caused by SND during aeration period could be enhanced. P removal efficiency increased as C/N ratio increased, because PAOs could get more organic carbon source from the influent to produce PHB and release PO4^3- , avoiding the adverse influence of NOx^- on PO4^-3- release. The higher the C/N ratio, the more the quantities of P release and uptake, the quicker P uptake rate, the better P removal performance was. Regardless of the C/N ratio, excellent COD （average 93.15 % ） removal efficiencies were maintained throughout the experiment. When Influent C/N ratio was bigger than 6.97 and organic load exceeded 0.38 kg/（kg·d）, SVI rose quickly as C/N ratio increased. Non-silk bacteria sludge bulge appeared because of low DO and high organic load.

关 键 词：UniFed SBR工艺 脱氮 除磷 碳氮比 

分 类 号：X703.1[环境科学与工程—环境工程]