METHOD FOR TREATING RECYCLE WATER OF WASTEWATER TREATMENT

摘要

A method for treating recycle water of wastewater treatment is provided to secure stable quality of effluent by simultaneously reducing a nitrogen load due to the recycle water of wastewater treatment and preventing the recycle water from having bad influences upon a water treatment system such as release suppression of phosphorous from an anaerobic tank and impediment of denitrification in an anoxic tank. In a method for treating recycle water of wastewater treatment, comprising a first settling process, a microorganism treatment process, a second settling process, a sludge returning process, a sludge treating process, and a recycle water treating process, wherein an anoxic tank of the microorganism treatment process is divided into a first anoxic tank(30) and a second anoxic tank(35), the method further comprises: a first denitrifying process of returning the recycle water nitritated in the recycle water treating process to the first anoxic tank to convert nitrite of the recycle water into nitrogen gas; and a second denitrifying process of returning internal return water returned from an aerobic tank(40) to the second anoxic tank to convert nitrate into nitrogen gas. The method further comprises dividingly flowing influent settled through the first settling process into an anaerobic tank(20), the first anoxic tank, and the second anoxic tank to supply a carbon source required for phosphorous release and denitrification.