| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To enhance the recovery rate (water cleaning efficiency) of cleaning effluent of a sand filter basin by efficiently treating the cleaning effluent. <P>SOLUTION: The cleaning effluent 22 is admitted from a sand filtration basin 16 into the coagulation and sedimentation basin 20 of a cleaning effluent treatment facility 10 and is separated at a high speed to thick sludge 32 and supernatant 26. The thick sludge 32 is stored together with the withdrawn sludge 15 in a sludge basin 18 and is then admitted into a sludge membrane separator 40 and membrane separated water 44 is formed in a rotary flat membrane separator 50. The membrane separated water 44 is refluxed to a reception well 12. On the other hand, the supernatant 26 of the coagulation and sedimentation basin 20 is subjected to membrane filtration in a supernatant membrane separator 28 and is refluxed as treated water 30 to the reception well 12. The membrane separated water 44 subjected to the membrane filtration and the treated water 30 are refluxed to the reception well 12, by which the increase of the treatment load in the sand filtration basin 16 is prevented. <P>COPYRIGHT: (C)2003,JPO</p> |
