Apparatus and method for automatic control of coagulant dosage in sewage and industrial wastewater treatment facilities and sewage and industrial wastewater treatment system for automatic control of coagulant dosage

Provided are a device and a method for automatically controlling the concentration of an injected coagulant for advanced phosphorus treatment in wastewater, and a wastewater treatment system capable of automatically controlling the concentration of an injected coagulant. The device for automatically controlling the concentration of an injected coagulant includes: an introduced water turbidity measuring device for measuring the turbidity of water introduced into a wastewater treatment facility; a coagulant injection control device for calculating the amount of the injected coagulant to remove total phosphorus (T-P) of the introduced water based on the measured turbidity of the introduced water; and a coagulant injection device for injecting the coagulant into the wastewater treatment facility according to the calculated amount of the injected coagulant. 하폐수 내 인 고도처리를 위한 응집제 주입농도 자동 제어장치 및 제어방법, 그리고, 응집제 주입농도 자동 제어가 가능한 하폐수처리 시스템이 제공된다. 응집제 주입농도 자동 제어장치는 하폐수처리시설로 유입되는 유입수의 탁도를 측정하는 유입수 탁도 측정장치와, 측정되는 유입수의 탁도에 기초하여 유입수의 총인(T-P: Total Phosphorus)을 제거하기 위한 응집제 주입량을 산출하는 응집제 주입 제어장치와, 산출된 응집제 주입량에 따라 응집제를 하폐수처리시설로 주입하는 응집제 주입장치를 포함한다.