基于内循环折流式反应器的同步硝化反硝化

Simultaneous nitrification and denitrification based on internal circulation baffled reactor

采用一种内循环折流式生物反应器进行脱氮实验.分别用硝酸盐、亚硝酸盐和氨作为氮源配制模拟废水进行研究.结果表明:该反应器具有良好的除氮功能.当以硝酸盐或亚硝酸盐为氮源时,总氮与硝酸盐、亚硝酸盐的去除速率几乎相同,其降解规律可以用分数级动力学进行很好地拟合,其反应级数为0.88.当以氨作为氮源时,可以实现同步硝化和反硝化.此时氨氮的去除仍可以0.88级动力学进行描述.而总氮的去除规律符合3级反应动力学.在相同的碳氮比(C/N)情况下,硝酸盐和亚硝酸盐的去除速率远大于氨氮的去除速率,且总氮的去除速率随C/N的增加而增加.

Nitrogen removal experiments were carried out by using an internal circulation baffled bioreactor （ICBBR）. Nitrate, nitrite and ammonia were used as N source for nitrogen removal experiments. The ICBBR has high nitrogen removal capacity. The removal rates of total nitrogen, nitrate, and nitrite are almost the same. When nitrate and nitrite were used as N sources their ki- netic orders were 0. 88. When ammonia was used as N source simultaneous nitrification and denitrifieation （SND） was realized in ICBBR and ammonia removal fitted also 0. 88 order kinetics, but total nitrogen removal fitted third-order kinetics. Nitrate and ni- trite removal rates were faster than ammonia removal rate under the same C/N ratio, and total nitrogen removal rate increased with increasing C/N ratio.