| 摘要 |
<p>PROBLEM TO BE SOLVED: To stabilize the waste water treatment load to aerobic microbes and improve and stabilize the water quality of treated water by connecting a raw water tank liquid level sensor, a raw water tank liquid level controller, a raw water flow rate sensor and a raw water flow rate controller between a neutralization tank and an aeration tank through a raw water supply piping. SOLUTION: A raw water tank 1, a neutralization tank 2 and an aeration tank 3 are provided successively in this order, and the neutralization tank 2 is connected with the aeration tank 3 by a raw water supply piping 8. A raw water tank liquid level sensor 4 and a raw water tank liquid level controller 5 are set in the raw water tank 1. Also, a raw water flow rate sensor 6 and a raw water flow rate controller 7 are set between the aeration tank 3 and the neutralization tank 2, and the output of the raw water tank liquid level controller 7 is controlled based on the output of the raw water tank liquid level controller 5 and the raw water flow rate sensor 6. Thus, a cascade control loop in which the raw water liquid level controller 5 is et on the master side and the raw water flow rate controller 7 is set on the slave side is formed. The operation of the waste water treatment equipment and the water quality of treated water are stabilized by the arrangement.</p> |
