| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a treatment method of liquid to be treated by which the liquid to be treated containing organic components or the like can be efficiently treated using simple means.SOLUTION: The treatment method of liquid to be treated is provided for treating the liquid to be treated using air volume control means controlling an air volume through air supply means in such a way that a DO (Dissolved Oxygen) in a treatment tank measured by DO measuring means 11 becomes a set DO. In advance, the liquid to be treated is collected from the treatment tank and/or a settling tank, the collected liquid to be treated is filtered using filtering means to collect a filtrate, and a correlation between the turbidity of the filtrate and the BOD of a supernatant or the filtrate is obtained by measuring the turbidity and the BOD. When the liquid to be treated is treated, the DO is changed until the turbidity of the filtrate becomes turbidity set by the correlation between turbidity and BOD, and the air volume to be supplied to the treatment tank is controlled .</p> |
