The present invention relates to a wastewater treatment apparatus. The present invention is to store the incoming raw water to relax the inflow load, ORP measuring device 13 for measuring the oxidation-reduction potential (hereinafter referred to as 'ORP') of the incoming raw water is installed therein A flow rate adjustment tank 10; Reactor 20 for biologically treating the raw water conveyed from the flow rate adjustment tank 10; And a control device 30 for controlling the transfer of raw water from the flow rate adjusting tank 10 to the reaction tank 20 according to the ORP measured by the ORP measuring device 13.;Wastewater Treatment System, Flow Adjustment Tank, Reactor, ORP
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