| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily and efficiently perform solid-liquid separation by enhancing sludge sedimation property of cleaning wastewater discharged from biomembrane filtration equipment. SOLUTION: The biomembrane filtration equipment 10 in which a membrane 13 is formed, is washed with water. The wastewater discharged from the biomembrane filtration equipment 10 is subjected to the solid-liquid separation in an initial sedimentation tank 20 after air is diffused in a cleaning wastewater storage tank 40 by using an air diffuser 41 and oxygen-containing gas is supplied thereto. When the oxygen-containing gas is supplied to the cleaning wastewater, the sludge contained in the cleaning wastewater is changed into a flock having good sedimentation property by dissolved oxygen in the cleaning wastewater, and the solid-liquid separation is improved.</p> |
