Patent ID: 6592751
Filing Date: 2003-07-15
Classification: C02F,Y02E,Y02W

Abstract:
A device for the biological treatment of wastewater containing biodegradable solids comprising a vertically oriented elongated vessel partitioned, in vertical progression, by impermeable substantially horizontal walls into a top chamber and a bottom chamber, each chamber being provided with a gas retention space and a liquid retention space, each pair of neighboring chambers defining a lower chamber and an upper chamber, a nozzle establishing fluid communication between the bottom chamber and the outside of the vessel for input of wastewater into the vessel; a nozzle establishing fluid communication between the liquid retention space of the top chamber with the outside of the vessel for discharge of treated wastewater from the vessel, and arranged so as to retain a level of liquid within the top chamber; a nozzle for discharge of gas from the gas retention space of the top chamber; further comprising for every pair of neighboring chambers, at least one filter chamber having at least one inlet communicating fluidly with a liquid retaining part in the lower chamber and at least one outlet communicating fluidly with the liquid retaining part of the upper chamber; a filter bed placed within said at least one filter chamber, and partly filling the internal volume of the at least one filter chamber; at least one gas conduit establishing fluid communication between a gas retaining space in the lower chamber with a gas retaining space of the upper chamber; and a discharge means enabling periodic discharge and stoppage of flow of gas through said at least one gas conduit.