摘要
The abundance of ammonia-oxidizing bacteria and archaea and their amo A genes from the aerobic activated sludge tanks,recycled sludge and anaerobic digesters of a full-scale wastewater treatment plant(WWTP)was determined.Polymerase chain reaction and denaturing gradient gel electrophoresis were used to generate diversity profiles,which showed that each population had a consistent profile although the abundance of individual members varied.In the aerobic tanks,the ammonia-oxidizing bacterial(AOB)population was more than 350 times more abundant than the ammonia-oxidizing archaeal(AOA)population,however in the digesters,the AOA population was more than 10 times more abundant.Measuring the activity of the amo A gene expression of the two populations using RT-PCR also showed that the AOA amo A gene was more active in the digesters than in the activated sludge tanks.Using batch reactors and dd PCR,amo A activity could be measured and it was found that when the AOB amo A activity was inhibited in the anoxic reactors,the expression of the AOA amo A gene increased fourfold.This suggests that these two populations may have a cooperative relationship for the oxidation of ammonia.
The abundance of ammonia-oxidizing bacteria and archaea and their amo A genes from the aerobic activated sludge tanks, recycled sludge and anaerobic digesters of a full-scale wastewater treatment plant(WWTP) was determined. Polymerase chain reaction and denaturing gradient gel electrophoresis were used to generate diversity profiles, which showed that each population had a consistent profile although the abundance of individual members varied. In the aerobic tanks, the ammonia-oxidizing bacterial(AOB) population was more than 350 times more abundant than the ammonia-oxidizing archaeal(AOA)population, however in the digesters, the AOA population was more than 10 times more abundant. Measuring the activity of the amo A gene expression of the two populations using RT-PCR also showed that the AOA amo A gene was more active in the digesters than in the activated sludge tanks. Using batch reactors and dd PCR, amo A activity could be measured and it was found that when the AOB amo A activity was inhibited in the anoxic reactors, the expression of the AOA amo A gene increased fourfold. This suggests that these two populations may have a cooperative relationship for the oxidation of ammonia.
基金
supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant (RGPIN/227565-2013) to K.A.G
