SYSTEM AND METHOD FOR TREATING WASTE WATER

PROBLEM TO BE SOLVED: To provide a system and a method for treating waste water which can keep water quality of treated water satisfactory.SOLUTION: The system for treating waste water in an embodiment includes a raw water tank, a primary treatment tank, an aerobic treatment tank, water supplying means, aeration means, a sensor, and a control unit. The control unit calculates a target aeration volume based on treatment index values measured by the sensor. When the target aeration volume is more than the minimum aeration volume of the aeration means, the aeration volume of the aeration means is made to be the target aeration volume. When the target aeration volume is equal to or less than the minimum aeration volume, the aeration volume of the aeration means is made to keep the value of the minimum aeration volume and the water supplying means is made to supply the raw water to the aerobic treatment tank.SELECTED DRAWING: Figure 2 【課題】処理水の水質を良好な状態に維持することができる排水処理システム及び排水処理方法を提供することである。【解決手段】実施形態の排水処理システムは、原水槽と、一次処理槽と、好気処理槽と、送水手段と、曝気手段と、センサと、制御装置と、を持つ。前記制御装置は、前記センサによって測定された処理指標値に基づき目標曝気量を算出し、前記目標曝気量が前記曝気手段の最小曝気量を超える場合は、前記曝気手段による曝気量を前記目標曝気量とさせ、前記目標曝気量が前記最小曝気量以下の場合は、前記曝気手段による曝気量を前記目標曝気量に維持させるとともに、前記送水手段により原水を前記好気処理槽に供給させるようにする。【選択図】図２