可降解硝态氮的歧化厌氧氨氧化颗粒污泥的驯化

Domestication of Disproportionated ANAMMOX Granular Sludge Capable of Biodegrading Nitrate

向SBR反应器中接种成熟的厌氧氨氧化颗粒污泥,在氨氮、亚硝态氮浓度均为100mg/L的条件下,按C/N值=0.1添加乙酸钠,研究乙酸钠对厌氧氨氧化菌去除氮素的影响。结果表明,在存在乙酸钠的条件下,出水硝态氮生成量为没有乙酸钠情况下的45%,对总氮的去除率提高到90%以上,有利于出水总氮浓度达到一级A标准。验证了在C/N值=0.1条件下,厌氧氨氧化反应是反应器中的主体反应,没有被反硝化反应取代。厌氧氨氧化菌可利用乙酸钠和硝态氮的代谢机制也为降低短程硝化控制难度提供了一种思路。

Mature ANAMMOX granular sludge was inoculated in a SBR to investigate the effect of sodium acetate on performance of ANAMMOX granular sludge under the conditions of 100 mg/L ammonia, 100 mg/L nitrite and sodium acetate added according to the C/N ratio of 0.1. The results showed that in the presence of sodium acetate, nitrate in effluent was 45% of that without sodium acetate, and the removal rate of TN was increased to over 90%. The existence of sodium acetate could help TN in the effluent to meet the first level A criteria in the national discharge standard. It was verified that ANAMMOX was the main reaction rather than denitrification in the reactor at C/N ratio of 0.1. The metabolism of ANAMMOX bacteria utilizing sodium acetate and nitrate provided an idea for reducing the difficulty of controlling short nitrification.