| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a biological water treatment equipment capable of efficiently controlling contaminant concentration after discharging treatment as a target value by setting a proper amount of air supply to mix water to be treated with the air so as to be cleaned even when a quantity of contaminant fluctuates in the water to be treated. SOLUTION: Air diffusers 41-44 are provided in the direction of flowing down the water to be treated in a biological reaction layer 1, and air supply devices 51-54 for supplying air are connected to each air diffuser 41-44, respectively. Furthermore, controllers 91-94 are connected to air supply device 51-54, respectively, and respective air supply amounts supplied from the air diffusers 41-44 connected to the controllers, respectively, are calculated by using an operation expression on the basis of values measured with a BOD concentration meter 2, a flowmeter 2 and a BOD concentration meter 10.</p> |
