The Effect of Adding Different Amount of Carbon Source on the Nitrogen Removal Efficiency of Tidal Flow Artificial Wetland

摘要

Based on the small trial of tidal flow artificial wetland, alkali-treated corn straw is used as carbon source supplement for denitrification. The author studys the effect of adding different amount of carbon source on removal efficiency of TN, (NH_4)~+-N, (NO_3)~--N, (NO_2)~--N and COD in the system. The results of the study show that: when the adding amount of alkaline straw are 0, 100g and 400g, (NH_4)~+-N average removal efficiency are respectively 59.9%, 66.96% and 71.91%; (NO_3)~--N average removal efficiency are respectively 54.89%, 72.33% and 81.36%; (NO_2)~--N average removal efficiency are respectively 12.76%, 24.91% and 40.97%; TN average removal efficiency are respectively 23.14%, 41.32% and 64%; COD average removal efficiency are respectively 83.94%, 81.29% and 77.85%. Alkali-treated corn straw can provide the carbon source that denitrification required for artificial wetland system. The added carbon source can significantly improve the nitrogen removal efficiency of the system, and the nitrogen removal efficiency of adding 400g alkali-treated corn straw is better than adding 100g alkali-treated corn straw, and it is not a burden for the system.