【作者】 隋鸿志；

【导师】 季民；

【作者基本信息】 天津大学 ， 环境工程， 2008， 硕士

【摘要】 随着水环境污染和水质富营养化问题的尖锐化以及人们公共环境意识的日益增强,迫使污水排放标准中对氮的要求越来越严格。污水处理技术逐渐地从以单一去除有机物为目的的阶段进入既要去除有机物,又要脱氮的深度处理阶段本论文以序批式活性污泥反应器(SBR)为主体,以生活污水为处理对象,研究其在缺氧-好氧运行条件下,同步硝化反硝化脱氮的效能。对影响同步硝化反硝化的各种因素进行了详细研究,并对脱氮机理进行了探讨。缺氧-好氧SBR反应器在处理生活污水试验中,对COD、氨氮、总氮的平均去除率分别为83.0%,86.0%,36.5%。运行后期虽然进水的污染物浓度波动变化比较大,但系统对COD、氨氮仍能保持较好的去除能力。系统具有一定的抗冲击负荷能力。对反应器运行过程中典型周期的分析,反映出SBR系统具有一定的同步硝化反硝化效果,但是效果不够理想。当处理低浓度城市污水时,要想达到较高的脱氮效果,可能需外加碳源。在小试实验中发现高有机负荷有助于提高缺氧-好氧SBR系统的同步硝化反硝化性能;反应器溶解氧控制在2.0~2.5 mg/L范围内时,有利于污泥的稳定和脱氮的效果。在试验条件下,系统中发生SND脱氮作用的主要作用机理是微环境理论和生物学理论,在反应初期以微环境理论为主导,而反应后期则是以生物学理论为主导。更多还原

【Abstract】 The standard of nitrogen discharge in wastewater was controlled more and more strictly with severe water pollution and eutrophication question occurred and the sense of environmental protection enhanced. The wastewater techniques developed gradually from the period of COD removal to simultaneous, nitrogen removal.The experiment about simultaneous nitrification denitrification(SND) was carried out operated with municipal wastewater by sequencing batch reactor (SBR). Some factors that effect SND were studied particularly. The mechanism of SND was analysised too.When the granular sludge SBR was applied to treat municipal wastewater, the average removal efficiencies of COD, NH4+-N, TN were 83.0%,86.0%,36.5%, respectively. Although the influent concentration varied a lot, the active sludge SBR still had good removal performance. The active sludge SBR had a certain ability to adapt shock loadings. Analysis of typical cycle showed that the active sludge has some nitrogen removal performance but not very good. When the low concentration of urban sewage is treated, in order to reach a higher nitrogen removal, it may take additional carbon.In a lab-scale anoxic-aerobic SBR, high organic loading is benefit for SND. The influent DO controlled in the range of 2.0~2.5 mg/L is good for maintain sludge stabilization and the nitrogen removal. During the trial conditions, the main mechanism of the system is micro-environment theory and biological theory. In the initial reaction, the micro-environment is the main, and the reaction later is the biological theory-driven.更多还原