SEWAGE TREATMENT AND SEWAGE TREATING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a sewage treating method and a sewage treating device capable of efficiently executing the decomposition treatment of a nitrogen compd. by realizing the increase of microorganism concn. in a treating tank. SOLUTION: In the sewage treating method in which the nitrogen compd. incorporated in the sewage introduced into the treating tank 18 is decomposed by using nitrifying bacteria or denitrifying bacteria, many hollow fibers 19 positively carrying microorganisms including the nitrifying bacteria or the denitrifying bacteria are arranged on the outside surface of a part or the whole of the treating tank 18, and the decomposition treatment of the nitrogen compd. incorporated in the sewage is executed.