基于厌氧氨氧化的含氨废气原位处理

Ammoniac Waste Gas in-situ Treatment Based on ANAMMOX Process

采用部分亚硝化-厌氧氨氧化一体化反应器研究了含氨废气原位脱氮处理的可行性.结果表明,在控制低溶解氧(0.2~1 mg·L^(-1)),pH为7.9~8.2,中温(30~35℃)条件下,经过60 d的运行,成功地实现部分亚硝化-厌氧氨氧化一体化反应器的启动,总氮去除率达到88%,氮去除速率由0.05 kg·(m^3·d)^(-1)上升并稳定在0.7 kg·(m^3·d)^(-1).在含氨废气处理研究中,当含氨废气浓度低于2.59%,废气中原有的氧过量,导致硝态氮大量累积;当含氨废气体积分数为2.59%~4.2%时,废气中氧满足反应器脱氮的需求;当含氨废气体积分数高于4.2%,需要额外通入空气,补充反应器内的氧需求.经过60 d的运行,氨气的去除率达100%,总氮去除率达90.06%,总氮去除负荷为0.51 kg·(m^3·d)^(-1).说明基于厌氧氨氧化反应的一体化反应器可实现含氨废气稳定去除.

The feasibility of ammoniac waste gas in-situ treatment by partial nitrification（PN）-anaerobic ammonia oxidation（ANAMMOX） reactor was studied. The PN-ANAMMOX reactor was successfuly started up after 60 d operation in conditions of low dissolved oxygen control（0.2 mg·L-1）, pH 7.9-8.2 and temperature（30-35℃）. The total nitrogen removal efficiency reached 88% and the nitrogen removal rate increased from 0.05 kg·（m3·d）-1 to 0.7 kg·（m3·d）-1. In the treatment of ammoniac waste gas, the excess oxygen in it would lead to massive growth of nitrifying bacteria, when the ammonia concentration was lower than 2.59%. The ammonia and oxygen in waste gas met the requirement of the reactor for nitrogen removal, when the ammonia concentration stayed between 2.59% and 4.2%. Extra air flow was required for reactor oxygen supplement when the ammonia concentration was higher than 4.2%. The ammonia removal efficiency reached 100%, the total nitrogen removal efficiency reached 90.06%, while the total nitrogen removal rate was 0.51 kg·（m3·d）-1 after 60 day operation for ammoniac waste gas purification. It is indicated that the integrated reactor based on PN-ANAMMOX process can achieve stable removal of ammonia waste gas.