污泥浓度、pH、NO_2^--N对反亚硝化脱氮的影响

Effects of MLSS、pH、NO_2^--N on denitritification

反亚硝化脱氮是反硝化过程中的一个重要环节,也是污水短程反硝化脱氮的重要组成部分.本文在亚硝酸氮浓度为30~110 mg.L-1范围内,主要考察了影响反亚硝化速率因素中的pH、NO2--N、MLSS的作用.研究表明,在温度为18℃,pH为7.5时,反亚硝化速率最大;NO2--N浓度为60 mg.L-1时的反亚硝化作用最强;MLSS高则整体反亚硝化脱氮速率快,但MLSS高则单位质量反亚硝化菌的效率低.

Denitritification is the key step a denitratification and to shortcut of nitrogen removal. In this paper, the effect of pH, MLSS and nitrite concentration on denitritification with nitrite concentration in the range of 30 - 110 mg · L^-1 is investi- gated. The results indicate that denitritification will be more active when the value of pH is 7.5 or nitrite concentration is 60 mg · L^-l. As the MLSS is increased, nitrite concentration falls rapidly and the efficiency of denitrificans is decreased.