兼氧条件下厨余垃圾发酵液作碳源的反硝化性能

在兼氧条件下，利用厨余垃圾厌氧发酵液调节反硝化系统的碳氮比（COD/TN，C/N），并考察了其脱氮性能.结果表明，不同C/N条件下，反应系统均未出现有机物的积累，但高C/N条件下的亚硝酸盐最大积累浓度和积累速率高于低C/N；随着进水C/N的增大，反应整体脱氮率和反硝化速率不断增大，当C/N为13时，反硝化速率达到了最大值，为9.79mg/（gVSS·h），其脱氮率超过95%；相同C/N条件下，反硝化速率和最大亚硝酸盐积累浓度均与进水硝酸盐浓度成正比.此外，实验结果表明，兼氧条件下的反硝化过程虽不易出现COD残留，但去除单位氮所需的有机物更多，且整体反硝化速率以及亚硝酸盐还原速率均低于厌氧条件.

The use of kitchen waste fermentation liquid as carbon source for denitrification based on facultative treatment system

The fermentation liquid of kitchen waste was used to adjust the ratio of carbon and nitrogen (C/N) in the denitrification system with facultative condition. Results showed that there was no accumulation of organic matter in the system, while the maximum accumulation concentration and efficiency of nitrite under high C/N conditions were higher than those of low C/N conditions. With the increase of C/N, the nitrogen removal rate and denitrification rate continued to increase. When C/N was 13, the denitrification rate achieved the maximum of 9.79mg/(gVSS·h), and the denitrification rate exceeded 95%. Besides, the denitrification rate and the maximum accumulation concentration of nitrite were directly proportional to influent nitrate concentration under the same C/N conditions. For facultative system, the removal of unit nitrogen required more organics, and the denitrification and nitrite reduction rate were lower than that of anaerobic system, although there was no COD residual occurring in the denitrification process.