亚硝酸盐对厌氧产甲烷反硝化反应的抑制机理

发布时间：2019-04-13 13:08

【摘要】：为了研究亚硝酸盐作为反硝化底物时的厌氧同时产甲烷反硝化的反应机理,拓展厌氧同时脱碳脱氮理论在高氮有机废水中的实际应用,文章采用批式实验方法,对比研究亚硝酸盐对厌氧颗粒污泥的同时产甲烷反硝化性能的影响。结果表明,亚硝酸盐浓度对厌氧颗粒污泥的活性有影响,在适宜的浓度条件下,随着亚硝酸盐的降解,颗粒污泥的活性会逐渐恢复,当亚硝酸盐浓度达到一定的抑制阙值时,例如试验条件下的400和600 mg/L,其对颗粒污泥的活性抑制是不可逆的;亚硝酸盐浓度对其本身参与的反硝化反应也有影响,但影响不大;亚硝酸盐浓度从20 mg/L增加到600 mg/L,其降解速率由22.26 mg/(h·g)增加至44.07 mg/(h·g)。在产甲烷活性恢复试验中,当反应样中的亚硝酸盐浓度分别为100、200、400、600 mg/L时,厌氧颗粒污泥的产甲烷活性比之前分别降低了4%、10%、100%、100%。
[Abstract]:In order to study the reaction mechanism of anaerobic simultaneous methane denitrification when nitrite is used as denitrifying substrate, and to expand the practical application of anaerobic simultaneous decarbonization and denitrification theory in high nitrogen organic wastewater, the batch experiment method was adopted in this paper. The effect of nitrite on simultaneous methane production and denitrification of anaerobic granular sludge was studied. The results showed that the nitrite concentration had an effect on the activity of anaerobic granular sludge. Under suitable concentration conditions, the activity of granular sludge would gradually recover with the degradation of nitrite, and when the concentration of nitrite reached a certain inhibition threshold, the activity of granular sludge would gradually recover with the degradation of nitrite. For example, the inhibition of granular sludge activity at 400 and 600 mg/L, under experimental conditions is irreversible. The nitrite concentration also affected the denitrification reaction, but it had little effect on the denitrification reaction. When nitrite concentration increased from 20 mg/L to 600 mg/L, the degradation rate increased from 22.26 mg/ (h 路g) to 44.07 mg/ (h 路g). The methane production activity of anaerobic granular sludge decreased by 4%, 10%, 100% and 100% respectively when the concentration of nitrite in the reaction sample was 100200400600 mg/L in the methanogenic activity recovery test.
【作者单位】：环境保护部南京环境科学研究所;华东交通大学土木建筑学院;河海大学环境学院;
【基金】：“十二五”农村领域国家科技计划课题(2013BAD21B03) 中央级公益性科研院所基本科研业务专项
【分类号】：X703

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