| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a wastewater treatment apparatus and a wastewater treatment method to obtain treated water by solid-liquid separation by having wastewater pass through an anaerobic tank, oxygen-free tank, aerobic tank, and membrane separation tank in this order in the presence of activated sludge, wherein BOD removal, denitrification, and dephosphorization of the wastewater are highly carried out with a simple constitution with controlled equipment cost and operation cost. <P>SOLUTION: The wastewater treatment apparatus, including the anaerobic tank 2, the oxygen-free tank 3, the aerobic tank 4, and a hollow fiber membrane separation tank 5 each separately, has a circulation pipe 9 for circulating returned sludge directly from the hollow fiber membrane separation tank 5 to the anaerobic tank 2 and the oxygen-free tank 3, and the treated water is treated in the anaerobic tank 2, the oxygen-free tank 3, the aerobic tank 4, and the hollow fiber membrane separation tank 5 in this order. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
