PHAs缓释碳源在垂直流人工湿地中的应用效果

Application Effect of Sustain-Released Carbon Source in Vertical Flow Constructed Wetland

对于低碳氮比的污水,在不外加碳源的情况下,以PHAs缓释碳源作为垂直流人工湿地的反硝化脱氮填料,通过对垂直流人工湿地的不同进水碳氮比、水力停留时间等条件进行优化,研究缓释碳源对人工湿地脱氮效果的影响。结果表明:整体上,PHAs缓释碳源的释碳速率及可控性均较好,能很好地起到提高碳氮比的作用,对于进水C/N比为3.5和3.0的污水脱硝态氮效果最佳,可达80%以上;对于不同的水力停留时间,综合经济性及反硝化脱氮效果,最佳水力停留时间为1.5 d。

For the sewage with low carbon-nitrogen ratio, without additional carbon source, PHAs sustain-released carbon source was used as denitrification fill for vertical flow constructed wetland, optimize the different carbon-nitrogen ratio and hydraulic retention time of vertical flow constructed wetland, researching the effect of sustain-released carbon source on the effect of nitrogen removal in constructed wetlands. The results show that the rate and controllability of carbon release of PHAs sustain-released carbon source were good, it worked well in improving the carbon to nitrogen ratio, When the carbon and nitrogen ratio were 3.5 and 3.0,the denitrification nitrogen effect of sewage is the best, up to over 80 %;For the different hydraulic retention time, consideration economy and denitrification nitrogen effect, the optimal hydraulic retention time was 1.5 d.