TREATMENT METHOD AND TREATMENT SYSTEM OF PLANT WASTEWATER

摘要

PROBLEM TO BE SOLVED: To provide a treatment method and a treatment system of plant wastewater by which a treatment cost for performing anaerobic and aerobic biological treatment on the plant wastewater containing organic matter is reduced and the property of treated water is improved.SOLUTION: A treatment method of dividing plant wastewater 10 containing organic compounds into a first part 11 and a second part 14 and performing biological treatment includes: an anaerobic treatment step of subjecting the first part 11 to anaerobic biological treatment in an anaerobic state and discharging anaerobic treated water 13; and an aerobic treatment step of subjecting the second part 14 not subjected to treatment in the anaerobic treatment step and the anaerobic treated water 13 to aerobic biological treatment while mixing the second part 14 and the anaerobic treated water 13.