挥发性脂肪酸碳源生物反硝化研究

Studies on Volatile Fatty Acids Carbon Source for Biological Denitrification

在悬浮污泥系统中，当ＰＨ、温度适宜，碳源无限制时，反硝化速率和耗碳速率动力学呈零级反应，当以挥以性脂肪酸（ＶＦＡ）为碳源时，异化反硝化的耗碳量接近于１．０７ｍｇＶＦＡＣ／ｍｇＮＯ＾－３－Ｎ。用于同化作用的碳仅占投加碳的一小部分，随着进水Ｃ／Ｎ的提高，污泥产率（ＹＮ）增加，用于同化作用的碳耗亦增加，出水氧化态氮降低。在ＰＨ７．５，温度２５℃，污泥产率０．７２ｍｇＶＳＳ／ｍｇＮＯ＾－３－Ｎ时。

In the suspended sludge system, when pH, temperatuer were suitable and carbon source was not limited, the denitrification and C uptake rate followed a zero-order reaction. When VFA was used for carbon source, consumed carbon quantity for denitrfication was closed to 1.07mg VFA-C/mg NO3--N. The carbon quantity for assimilation occupied part of carbon source added. As rising of influent C/N, the sludge yield (YN) grow up, this part of carbon consumption increased and the effluent oxidized nitrogen decreased. Under pH 7.5, temperature 25℃, sludge yield 0.72 mgVSS/mg NO3--N, the influent VFA-C/NO3--N suitable value was 1.43 for complete denitrification.