| 摘要 |
A filtration device 50 which has a large number of filters 52 each comprising a filter element and a casing, and has such a structure that filter strings 82 are constructed in such a manner that a plurality of filters 52 are connected in a row by header tubes 58 such as unfiltered liquid feeding header tube 60 , filtrate recovery header tube 62 and unfiltered liquid recovery header tube 64 , and at least two rows of filter strings 82 are further connected in parallel by a filtrate recovery collecting tube 84 , and furthermore the filtrate recovery collecting tube 84 is placed at a higher position than the filtrate recovery header tubes 62.
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