NO and N2O accumulation during nitrite-based sulfide-oxidizing autotrophic denitrification

promoted by the low ratio of S/N. N2O accumulation resulted from the combined action of H2S and free nitrous acid (FNA). Both H2S and FNA could inhibit N2O reductase activity. The two stages that HS- oxidized to S0 and S0 oxidized to SO42- proceed successively and could be distinguished by pH variation. Thiobacillus、Ottowia 、Thiovirga presented the functional genera to remove sulfide and nitrite in this studied reactor.

该反应受低S/N比（信噪比，Signal-to-Noise Ratio）的促进。一氧化二氮（N2O）的积累由硫化氢（H2S）与游离亚硝酸（FNA）共同作用导致。二者均可抑制一氧化二氮还原酶的活性。硫氢根（HS-）氧化为单质硫（S0）以及单质硫进一步氧化为硫酸根（SO42-）的两个阶段依次进行，可通过pH变化加以区分。本研究的反应器中，硫杆菌属（Thiobacillus）、奥托氏菌属（Ottowia）与硫丝菌属（Thiovirga）为负责去除硫化物与亚硝酸盐的功能菌属。