微囊藻-附生菌共生系统处理含硝酸盐氮废水研究

Application of Microcystis-bacterial Consortium for Nitrate-containing Wastewater Treatment

藻-菌共生系统可实现高效脱氮除磷,从而在废水处理领域日益受到关注。为探究微囊藻-附生菌共生系统对废水中硝酸盐氮的去除效应,于太湖蓝藻水华频发季节进行了野外模拟试验。结果表明,共生体系中89%的硝酸盐氮被去除,去除速率达到0.35mg·N·L^-1·d^-1。试验第7天,体系中的氨氮浓度开始呈现白天降低、夜间上升的昼夜变化趋势,而硝酸盐氮则正好相反,表明体系中存在着氨氮硝化和硝酸盐氮还原的耦合过程,结合体系中亚硝酸盐氮的积累,可以推测,耦合硝化-反硝化过程是微囊藻-附生菌共生系统中氮素去除的主要途径。

Due to the high efficiency of nitrogen and phosphorus removal, algal–bacterial consortium has received increasing attention in wastewater treatment field. To explore the nitrate removal efficiency by Microcystis-attached bacteria consortium, a field simulation experiment was conducted during the cyanobacteria blooms in Taihu Lake. The results showed that 89 % of the nitrate in the symbiotic system were removed, and the removal rate was about 0.35 mg·N·L^-1·d^-1. On the 7th day of the experiment, the ammonia nitrogen in the system decreased at daytime and increased at nighttime, while nitrate nitrogen showed the opposite trend, indicating a diurnal variation of nitrification and nitrate reduction in the system. Combined with the accumulation of nitrite, it can be speculated that coupling nitrification-denitrification was the main pathway of nitrogen removal in the system.