Patent ID: 8133394
Filing Date: 2012-03-13
Classification: B01D,C02F,Y02W

Abstract:
1. A method for purifying wastewater in a device, said device comprising a cup-shaped vessel which has a wastewater inlet tube for water at a predetermined level and an outlet tube at a lower level than the inlet tube, and a horizontal distribution disc, which vertically divides the vessel, having at least one opening and being provided with a substantially vertical distribution tube for receiving the water from the inlet tube and for liquid contact between portions of the vessel which are above and below the distribution disc, wherein said method comprises supplying said wastewater to said inlet tube and through said distribution tube, depositing sludge on a bottom of the vessel, pumping water through and above the distribution disc through a filter head with a filter to provide filtered water and sinking contaminants from said wastewater to the bottom of the vessel, allowing the filtered water to be let out through the outlet tube, transferring reject water from the filter back to the distribution tube, and adding flocculation agent to the reject water before the reject water reaches the distribution tube.