Study on nitrogen removal from wastewater in a new co-immobilized cells membrane bioreactor
新型固定化细胞膜反应器脱氮研究

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