The present invention relates to a kind of methods to be used for treating sewage or waste water, it includes the fermentation tank in the processing method being made of a biological reaction pool and a sedimentation basin, the raw sewage that wherein precipitate solid material by including the waste water flowed out from the first sedimentation basin forms ferments in fermentation tank, basic organic acid is used as an electronq donor for the denitrogenation of nitrogen oxide by denitrification method, although the dissolved organic matter for being included in the effluent of the first clarifier is used as electronq donor for the denitrogenation of nitrogen oxide, the present invention relates to the processing methods of the waste water of a high quality of the processing disposition for facilitating raw sewage for it, it is economical and effective nitrogen-dephosphorization of the maintenance of anaerobic condition odorous and by denitrogenation or release for phosphorus.
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