新型固定化细胞膜反应器脱氮研究

Study on nitrogen removal from wastewater in a new co-immobilized cells membrane bioreactor

研究了一种新型的废水生物脱氮反应器 ,即利用固定化细胞膜将反应器一隔为二 ,膜的一侧与好氧的氨氮废水接触 ,另一侧与缺氧的乙醇水溶液 (反硝化碳源 )接触 .固定于膜中的硝化细菌将氨氮氧化成亚硝氮和硝氮 ,随即被同一膜中的反硝化细菌还原成氮气 .硝化细菌和反硝化细菌混合固定于膜内时的氨氧化速率约为硝化细菌单独固定时的 2倍 .未发现碳源重复利用对脱氮过程产生不利影响 .此新型反应器可以稳定运行 5

A new bioreactor (double chambered bioreactor) for the nitrogen removal from wastewater was described which consisted of a plate membrane containing nitrifying organisms and denitrifying organisms The one side of the co-immobilized cells membrane was in aerobic contact with wastewater containing ammonia, while the other side of the membrane was in anoxic contact with ethanol solution (carbon sources for denitrification) Nitrifying bacteria oxidized ammonia to nitrite and nitrate in the membrane, and then denitrifying bacteria reduced nitrite and nitrate to nitrogen gas in the same membrane The co-immobilized nitrifying organisms and denitrifying organisms accelerated the nitrification rate two times faster than the rate of the immobilized nitrifying organisms alone, although the initial densities of nitrifying organisms in the two membranes were the same The effect of carbon sources reuse on biological nitrogen removal process wasn't found in the experiment The co-immobilized cells membrane remained stable for a period of more then 50 days