Patent ID: 8951411
Filing Date: 2015-02-10
Classification: B01D,C02F

Abstract:
1. A multi-step press apparatus for automatic sludge dewatering and waste water filtration, comprising: a substantially cylindrical tank for receiving a mixture of sludge or waste water and coagulant, wherein a centralized inflatable membrane, positioned to press said solids against said screen, whereby a stream of discharged, cleared liquid, passes through the screen and is discharged to a sewage drain or a further tank, said screen being provided with perforations sized to enable the passage of clear liquid there through while retaining fine and coagulated solids on the internal surface thereof; a level sensor to detect when said tank has received sufficient sludge or waste water as to render the tank substantially full and to control a sequence of operation, and a filling and pressing duration as a function of said level, whereby a solids cake of about 30 mm thickness of fine and coagulated solids is formed and retained on the internal surface of the cylindrical filter screen, thereby improving the filtering and dewatering capacity of the apparatus, said apparatus further comprising: