同步硝化反硝化脱氮及处理过程中N2O的控制研究

由于水体富营养化和温室气体控制的需要 ,使得具有高效率脱氮 ,同时N2 O逸出最少化的水处理技术的研究开发变得十分迫切 .本文报道了采用新型同步硝化反硝化工艺 (SND)的研究成果 .与传统顺序式硝化反硝化 (SQND)技术相比 ,SND工艺的脱氮与SQND的效率相近 ,可随溶解氧浓度降低而提高 ,但N2 O逸出量显著降低 ,且碳氮比的提高可进一步减少N2 O的排放

Nitrogen Removal by Simultaneous Nitrification and Denitrification for Control of N2O Emission

Control of eutrophication in lake basins claims wastewater treatment techniques with high efficiency for nitrogen removal, and in the same time, it is also needed to reduce N 2O emission from the process of nitrification and denitrification for the purpose of controlling the global warming. Therefore, it is of significance to develop practical wastewater processes with high efficiency of nitrogen removal and with low N 2O emission as well. In this study, a new process of simultaneous nitrification and denitrification (SND) is investigated and some comparative studies between processes of SND and SQND (sequential nitrification and denitrification) are made. Compared with traditional SQND, SND has a similar efficiency for total nitrogen removal, which can be improved under a lower DO concentration, but the later can reduce N 2O emission considerably. Experimental results also indicate that the ratio of TOC to nitrogen has an important influence on N 2O emission both from the process of nitrification and from the process of denitrification, and higher value of TOC/N can produce lower N 2O emission.