以陶粒硫磺为填料的混合营养反硝化脱氮效能探究

Study on Mixotrophic Denitrification Using Ceramide and Sulfur As Fillers

为进一步降低城市污水处理厂出水的氮含量,实验设计了硫自养与异养混合营养反硝化体系,实验将陶粒和硫磺混合,共设置了7个不同的组合F0~F6,硫磺在F0~F6中的占比分别为0、1/6、2/6、3/6、4/6、5/6、6/6,其中F0为异养反硝化对照组,F1~F6为实验组。实验结果表明,实验组中F1、F2的脱氮效果较好,总氮去除率依次为89.96%和93.03%,分别接近和超过F0,且F1、F2相对于F0,体系的pH更加稳定;实验结束时,F1、F2两组的生物量分别为30.32、27.67 nmolP/g,低于F0,若各组的生物代谢速率相同,则F1、F2分别要比F0减少11.4%和19.2%的污泥量,认为F1和F2两种陶粒硫磺比例适合用于硫自养与异养反硝化的耦合,F1、F2中的硫磺占比分别为1/6和2/6,即陶粒∶硫磺(体积比)分别等于5:1和2:1。

In order to further reduce the nitrogen content of effluent from municipal sewage treatment plant,a mixotrophic denitrification system was designed.In the experiment,ceramic particles were mixed with sulfur particles,and seven different combinations of F0~F6 were set up.The proportion of sulfur in F0~F6 was 0,1/6,2/6,3/6,4/6,5/6,6/6,respectively.F0 was the heterotrophic denitrification control group,and F1~F6 were the experimental groups.The experimental results showed that the nitrogen removal efficiency of F1 and F2 was better in the experimental group,and the total nitrogen removal rates were 89.96%and 93.03%,which were close to and higher than F0,respectively.Moreover,compared with F0,the pH of F1 and F2 was more stable.At the end of the experiment,the biomass of F1 and F2 groups was 30.32 and 27.67 nmolP/g,respectively,lower than that of F0.If the biological metabolic rate of each group was the same,the sludge content of F1 and F2 would be reduced by 11.4%and 19.2%compared with F0,respectively.It is concluded that the sulfur ratio of F1 and F2 is suitable for the mixotrophic denitrification system.The sulfur ratio in F1 and F2 is 1/6 and 2/6 respectively,that is,the ceramisite:sulfur(by volume)is 5:1 and 2:1,respectively.