WASTE WATER TREATMENT METHOD AND WASTE WATER TREATMENT SYSTEM

摘要

This wastewater treatment method involves adding nitrates and an alkali to wastewater and aerating the wastewater such that the oxidation-reduction potential in the biological treatment tank for biologically treating the wastewater is ±0mV or greater and the dissolved oxygen concentration is 1mg/L or less. Further, this wastewater treatment system for treating wastewater is provided with a biological treatment tank for biologically treating wastewater, a nitrate adding means for adding nitrates to the wastewater, and an alkali adding means for adding an alkali to the wastewater.