OXIDATION DITCH-TYPE WASTE WATER TREATING DEVICE AND ITS CENTRALIZED CONTROL SYSTEM

摘要

PURPOSE:To obtain the discharge of COD at a low cost without using an expen sive flow indicating and integrating meter conventionally used to obtain the COD discharge per 24hr of the treated water discharged from an oxidation ditch-type waste water treating device. CONSTITUTION:The raw water is transferred to an oxidation ditch 11 from a tank 10, aerated in the ditch, transferred to a settling tank 14 and settled, and the treated water from the settling tank is discharged through a sterilizing tank 15 by this oxidation ditch-type waste water treating device. A flow indicating and integrating meter 19 to measure the inflow of raw water to the ditch from the raw water tank is installed, and a COD meter 20 for for measuring the COD of the treated water is furnished to the sterilizing tank or in the discharge passage of treated water. Further, a computing element 22 is installed to calculate the discharge of COD per 24 hr based on the outputs from the flow indicating and integrating meter and the COD meter.