1, Objective: To screen nitrobacter that could be used to treat ammonia nitrogen pollution, dejecta and sewage in military tunnel.

2, Besides the well known autotrophic nitrifiers belonging to the Nitrosomonas and Nitrobacter groups, there are some heterotrophic microorganisms and methanotrophic bacteria that are able to do the job.

3, In non-rhizosphere soil , the number of K bacterial and nitrobacter reached maximum at blossom period , while in rhizosphere soil , they reached maximum at fruit stage.

4, The number of heterotrophic bacteria and nitrifying bacteria increased with the time of the hydraulic retention time, contrary to the nitrobacter.

5, The temperature has much greater effect on the Nitrosomonas than Nitrobacter, nitrite accumulation in the middle of the reactor at high temperature.