| 摘要 |
<p>PURPOSE:To control biological treatment of sewage to stably obtain treated water with good quality by grasping the living things adhering conditions in a filled bed and carry out backwash properly in the biological treatment of sewage when the sewage is led to pass the filled bed of the living things adhering medium. CONSTITUTION:In a biological treatment apparatus like an anaerobic filtration bed tank 2, turbidity of the treated water flowing out after being brought into contact with a filtration bed 9 is measured by a turbidity meter 14 and, according to the measaured value, the treatment is controlled to carry out sludge discharge from a sludge accumulating part 11 through a sludge drawing out pipe 2 and/or to carry out back wash by sending air to a backwash pipe 10.</p> |
