Inhibition of free nitrite acid on nitrification

A sequencing batch reactor (SBR) was used to investigate the inhibition of free nitrite acid (FNA) on nitrite-oxidizing bacteria (NOB) and the effect of free nitrite acid (FNA) on the nitrification of waste water rich in nitrogen on the premise that the nitrogen were removed. The results showed that the inhibition of FNA on NOB was significantly, and short-cut nitrification can stated up successfully by using this way. When the lowest FNA was above 0.04mg/L, the processing efficiency of NOB was only 80% compared the highest FNA was below 0.015mg/L. When the lowest FNA was above 0.03mg/L, the processing efficiency of NOB was only 75% compared the highest FNA was below 0.02mg/L. FNA will need to reach a certain concentration produced significant inhibition on NOB effect.