| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent occurrences of troubles even if blocking of a filtration film occurs in a wastewater treatment using a membrane separation tank. SOLUTION: Wastewater is fed into a flow regulation tank 10, where the flow rate of the wastewater is adjusted, and the wastewater is fed into a membrane separation tank 12 to purify it by means of activated sludge in the tank 12. A solid-liquid separation of the wastewater is effected by a forced membrane filtration action using a membrane separation device 30 in the tank 12, and treated water is taken out to discharge it. When blocking of a filtration membrane 28 of the tank 12 occurs, wastewater to be received in the tank 10 is caused to flow into the tank 12, while the liquid in the tank 12 is returned to the tank 10, where a solid-liquid separation is effected by settling the liquid to discharge a supernatant liquor.</p> |
