碳源强化下的硫自养/异养反硝化协同作用

In order to strengthen the process of sulfur autotrophic denitrification, a small amount of carbon source was added to the sulfur autotrophic denitrification reactor, and the dosage was 5.99, 11.98, 23.96 mg•L^-1. Then the changes of nitrate nitrogen, COD, sulfate and alkali consumption in the reactor before and after the dosing were analyzed, the efficiency and reaction mechanism of sulfur autotrophic denitrification under carbon source enhancement were studied. The results showed that adding a small amount of carbon source dosing could enhance the nitrate removal effect during autotrophic denitrification process; the COD utilization ratios at three dosages of carbon resource were above 85%, but the yield of sulphate didn’t decrease. The actual alkali consumption of the system at the dosage of 5.99 mg•L^-1 was more than the theoretical alkali consumption measured by sulfate and COD, while the actual alkali consumption at the dosages of 11.98 mg•L^-1 and 23.96 mg•L^-1 were between the two theoretical values. After adding carbon source, the efficiency of autotrophic denitrification was significantly improved, and the trend of heterotrophic denitrification increased with the increase of carbon source input.