DEVICE FOR DEHYDRATING PRIMARY DEHYDRATED GRANULAR SLUDGE

PURPOSE:To uniformize the tension of a filter cloth and to facilitate the exchange of filter cloths by detaining both ends of a filter cloth laid over a filter plate and a guide roller with the winding roller and filter cloth roller of specified simple structure, and winding the filter cloth. CONSTITUTION:When the first dehydration stage is finished, the gaps between the adjacent pressing plates 5 and the filter plate 6 are opened, and the dehydrated sludge is dropped. A driving means 69 is then operated to rotate the winding roller 63 in the winding direction, and hence the filter cloth roller 64 is rotated in the rewinding direction by a synchronous rotating mechanism 68. The filter cloth 66 is cleaned by the washing water injected from a washing water nozzle 67 simultaneously with the start of rewinding, and wound on the winding roller 63 always as the cleaned filter cloth. When all the filter cloth 66 is wound, both rollers are rotated in the opposite direction. Since both ends of the filter cloth 66 are detained by a filter cloth mounting rod 71 through the notches 72 of the rollers 63 and 64 provided in the axial direction, the filter cloth is not detached from the rollers.