WASTEWATER TREATMENT APPARATUS AND WASTEWATER LOAD DETECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a wastewater treatment apparatus capable of easily detecting fluctuations of BOD load of wastewater for a short time and capable of suppressing the autolysis of sludge or reducing operation cost. SOLUTION: A part of wastewater and a part of sludge are introduced into a reaction container and a change of the concentration of dissolved carbon dioxide in the reaction container is measured and the BOD load of wastewater is estimated on the basis of a state of the concentration change and the introducing amount of oxygen into an aeration tank is regulated corresponding to the estimated BOD load.