无机条件下硫酸盐型厌氧氨氧化反应的特性

在循环流厌氧反应器中研究了无机条件下采用厌氧颗粒污泥启动硫酸盐型厌氧氨氧化(S-ANAMMOX)的反应特性。结果表明:在1~124 d的运行时间内,从第37天开始出现了NH4+-N和SO_4~(2-)的同步去除,生成NO_2~-,NO_3~-,反应最终产物为N2和单质硫,NH4+-N和SO_4~(2-)的最高去除率分别达到92.47%和59.3%;当进水nN∶nS较高时,能显著提高NH4+-N去除率和总氮去除率;SO_4~(2-)与NH4+发生氧化还原反应产生NO2-和NO3-是pH降低的过程;进水nN∶nS、进水平均NH_4~+-N、SO_4~(2-)质量浓度和HRT均对S-ANAMMOX反应的氮硫转化比有一定影响,表明S-ANAMMOX反应是一个多步反应。

Characteristics of sulfate-dependent anaerobic ammonium oxidation under inorganic carbon condition

The characteristics of sulfate-dependent anaerobic ammonium oxidation （S-ANAMMOX） under inorganic carbon condition were studied using anaerobic granule sludge in a circular flow anaerobic reactor. The results showed that：In 1-124 d of operation,the phenomenon of simultaneous ammonium and sulfate removal emerged from the 37^th d,producing NO₂^-,NO₃^- in reaction process,N₂ and elemental sulfate in the end,and the removal rate of NH₄⁺-N and SO₄^2- achieved up to 92.47% and 92.47%,respectively;The NH₄ ⁺-N removal rate and nitrogen loss rate could be increased with high inlet n_N∶n_S;This oxidation-reduction process of ammonia and sulfate is a pH-dropping reaction;The inlet n_N∶n_S, average inlet mass concentration of NH₄⁺-N and SO₄^2- and HRT all had effects on the nitrogen-sulfur conversion ratio of S-ANAMMOX reaction,which meant the S-ANAMMOX reaction was a multi-step reaction.