| 摘要 |
PURPOSE:To obtain a dehydrated cake with low water content, by adding a strong cationic org. high-molecular flocculant with a specific molecular wt. to conc. sludge with a concn. of 1-5% and further adding a specific amount of an inorg. flocculation aid thereto before performing compression dehydration under pressure of 10kg/cm<2> or more. CONSTITUTION:A strong cationic org. high-molecular flocculant with a molecular wt. of 100,000-150,000,000 is added to concn. sludge with a concn. of 1-5% to flocculate the same. In the next step, an inorg. flocculation aid such as slaked lime or an iron salt is added thereto in an amount of 1-2.0% on the solid basis of the aforementioned sludge while the flocculated sludge is dehydrated under pressure of 10kg/cm<2> or more by a filter press having a compression apparatus. That is, the flocculated sludge is introduced into a filter chamber 2 formed between filter plates 1, 1 under pressure and the dehydrated sludge is dehydrated under compression by a diaphragm 3. The dehydrated cake generated between filter cloths 4, 4 is discharged by downwardly running said filter cloths 4, 4.
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