Campos J L, Carvalho S, Portela R, Mosquera-Corral A, Méndez R
Department of Chemical Engineering, Institute of Technological Research, School of Engineering, University of Santiago de Compostela, Rua Lope Gómez de Marzoa, E-15782 Santiago de Compostela, Spain.
Bioresour Technol. 2008 Mar;99(5):1293-9. doi: 10.1016/j.biortech.2007.02.007. Epub 2007 Mar 30.
The influence of different sulphur to nitrogen (S/N) ratios on the specific autotrophic denitrification activity was studied in batch experiments using thiosulphate and nitrate as substrates. Transitory accumulations of nitrite were observed for assays with S/N ratios of 3.70 and 6.67 g/g, probably due to the higher specific reduction rate of nitrate compared to that of nitrite. Nitrite was the main end product when S/N ratios of 1.16 and 2.44 g/g were tested. The effects of endogenous (NO(3)(-),NO(2)(-),S(2)O(3)(2-)and SO(4)(2-)) and exogenous compounds (acetate and NaCl) on the specific denitrifying activity of the sludge were tested. Nitrite and sulphate did exert clear inhibitory effects over the process while thiosulphate, acetate and NaCl did not have strong effects at the concentrations tested. Similar experiments also showed that sulphur was not a suitable electron donor for these microorganisms, but sulphide was used successfully.
在以硫代硫酸盐和硝酸盐为底物的批次实验中，研究了不同硫氮（S/N）比对特定自养反硝化活性的影响。对于S/N比为3.70和6.67 g/g的实验，观察到亚硝酸盐的短暂积累，这可能是由于硝酸盐的比还原速率高于亚硝酸盐。当测试S/N比为1.16和2.44 g/g时，亚硝酸盐是主要终产物。测试了内源性（NO₃⁻、NO₂⁻、S₂O₃²⁻和SO₄²⁻）和外源性化合物（乙酸盐和NaCl）对污泥特定反硝化活性的影响。亚硝酸盐和硫酸盐对该过程确实有明显的抑制作用，而硫代硫酸盐、乙酸盐和NaCl在所测试的浓度下没有显著影响。类似的实验还表明，硫不是这些微生物合适的电子供体，但硫化物被成功使用。
