| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a method and an apparatus for washing a filtration body of a liquid-solid separation apparatus for biologically treated wastewater in which filtration flux, which is roughly same as an initial-value, is obtained for long duration and stably by washing, and further steady water quality can be obtained too. SOLUTION: In a liquid-solid separation method in which an activated sludge mixed solution in a biological reactor is supplied to a filtration separator wherein a water permeable filtration body module is dipped, filtrate is obtained by carrying out filtration by means of forming a dynamic filtration layer of sludge on the surface of the filtration body and the activated sludge mixed solution after filtration is returned to the biological reactor, the method and the apparatus for washing the filtration body by using ozone are characterized in that washing of the filtration body is carried out by aerating with gas containing ozone from an air diffuser, which is disposed on the lower part of the filtration body, and supplying gas containing ozone and back-washing water, which is injected gas containing ozone, into the inner portion of the filtration body simultaneously or alternately.</p> |
