碳源强化下的硫自养/异养反硝化协同作用

Synergistic analysis of sulfur autotrophic/heterotrophic denitrification under carbon source enhancement

为强化硫自养反硝化过程,通过向连续稳定运行的硫自养反硝化反应器内投加少量碳源以进行强化,乙酸钠投加量分别为5.99、11.98、23.96 mg·L^-1。分析投加前后反应器内硝氮、COD、硫酸根和耗碱量的变化;研究了碳源强化下硫自养反硝化运行效能及反应机理。结果表明,投加少量碳源可增强自养反硝化过程硝氮的去除效果;在3种碳源投加量条件下,COD的利用率均大于85%,但硫酸盐生成量并未减少;在5.99 mg·L^-1碳源投加量下,系统实际耗碱量大于以硫酸根和COD计的理论耗碱量,而在11.98 mg·L^-1和23.96 mg·L^-1投加量下,实际耗碱量均介于2种理论值之间。在投加少量碳源后,自养反硝化脱氮效果明显提高,异养反硝化趋势随着碳源投加量的增加而增加。

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.