有机碳源对低碳氮比生活污水好氧脱氮的影响  

Effect of organic carbon on aerobic nitrogen removal in treatment of low COD/TN domestic wastewater

作　　者：高景峰[1] 彭永臻[1] 王淑莹[1] 

机构地区：[1]北京工业大学环境与能源工程学院,北京100022

出　　处：《安全与环境学报》2005年第6期11-15,共5页Journal of Safety and Environment

基　　金：国家自然科学基金资助项目(50508001);北京市教育委员会科技发展计划面上项目(KM200510005020);湖北省废物地质处置与环境保护重点实验室开放研究基金资助项目(HBWDEP-2003-04);北京工业大学校青年基金项目(97005013200303)

摘　　要：利用间歇式生物膜反应器研究了有机碳源对低碳氮比(COD/TN在3左右)实际生活污水好氧脱氮的影响。处理实际生活污水的实验结果表明,在好氧条件下总氮平均去除率为80%。投加葡萄糖进行5个碳氮比的对比实验,随着COD/TN的升高,好氧总氮去除率由67%(COD/TN=1.63)逐渐上升至93.6%(COD/TN=8.43);但是当COD/TN超过8.43后,总氮去除率提高的并不明显(当COD/TN为8.89时,总氮去除率为96.8%)。最后进行了不含有机碳源的实验,其好氧总氮平均去除率为24%。综合分析表明,同时硝化反硝化和好氧脱氨共同导致了SBBR处理低碳氮比生活污水的好氧脱氮。此外,在所有实验过程中,好氧脱氮终点在DO和pH的变化曲线上有相应的跃升点。利用该特征点可以实时控制好氧脱氮的反应时间,并有利于实现短程好氧脱氮。The present article aims to introduce the author＇s research on the effect of organic carbon on the aerobic nitrogen removal in the treatment of low COD/TN domestic wastewater. Low CON/TN is one of the most difficulties for achieving high TN removal rate in wastewater treatment. In order to investigate the effect of organic carbon on the aerobic nitrogen removal, it is necessary to treat real domestic wastewater （average COD/TN ratio was about 3） in Sequencing Batch Biofilm Reactor （SBBR）. When doing the experiments, a cycle run of SBBR usually consists of filling, aeration and decant with no setting or anoxic/anaerobic stages setup. The results of the treatment show that at the end of aeration the average TN removing rate can be as high as 80% . When glucose is added in diluted domestic wastewater to adjust the COD/TN ratio in five levels （ 1.63, 3.9, 7.64, 8.43 and 8.89）, with the increase of COD/TN, the TN removing rate would increase from 67% （COD/TN=1.63） to 93.6% （COD/ TN= 8.43）. When COD/TN ratio is larger than 8.43, the TN removal rate will in turn increase slower （ that is, when TN removal rate is 96.8% , COD/TN=8.89） . And, finally, when the synthetic wastewater with no organic carbon is treated; the average TN removal rate is only 24% . All the results show that the existence of Simultaneous Nitrification and Denitrification （SND） proves to be the main reason that has caused the aerobic nitrogen removal. Denitrifier in the anoxic microzone of the biofilm may use the stored substrate, such as PHAs etc, as organic carbon, but the rate of denitrification is lower than that of the traditional denitriflcation. The physical explanation of SND in the biofilm can be approved that there are DO concentration gradients arising from diffusion limitations. Another reason is aerobic deammonification. Both of them account for the microbiological experiments. In all the experiments, at the end of aerobic nitrogen removal, DO jumped quickly and pH turned from decrease to increase. The two p

关 键 词：环境工程 低碳氮比 实际生活污水 好氧脱氮 同时硝化反硝化 好氧脱氨 实时控制 

分 类 号：X703.1[环境科学与工程—环境工程]