DEHYDRATION OF SLUDGE

摘要: PURPOSE:To dehydrate sludge to a high degree at low cost without using flocculant, by bringing the formed in purification of filthy water into contact with conc. salt through permeable membrane utilize osmotic pressure derived from water. CONSTITUTION:Sludge 3 is supplied space between endless belts 13 and 17 belt conveyers 14 17, respectively, an dehydrator 1. On other hand, 4 concurrently 14a surrounded conveyer brought comprising membrane, so that dehydrated discharged as cake 5 having water- retaining ratio below 60%. The permeating liquid 6 separated reverse osmosis-treated 7 which part removed osmosis device 2. fed 1 again cyclically used. In this way, can be utilizing mechanical press or like.