Patent ID: 7442307
Filing Date: 2008-10-28
Classification: C02F,Y02W

Abstract:
1. Equipment for the treatment of waste-water containing organic pollutants, comprising: a main reactor; an anterior reactor; and means for feeding in untreated sewage, removing cleaned water and sludge, and aerating waste-water entered into the main reactor; said anterior reactor including a mixer; the main reactor and the anterior reactor being separated from each other by a partition wall; said equipment further comprising at least one device between the main reactor and the anterior reactor for recirculation of waste-water; said at least one device having a U-shaped pipe-piece providing arms for the recirculation, one arm of the U-shaped pipe-piece being situated in the anterior reactor, another arm of the U-shaped pipe-piece being situated in the main reactor; said partition wall separating a lower end of said one arm and a lower end of said another arm, said lower end of said one arm and said lower end of said another arm being connected by a pipe passing through said partition wall; an upper end of said one arm and an upper end of said another arm being situated at a height corresponding to a minimum water-level as determined in the main and aeration reactors; wherein an air-pipe with an end-fitting ensuring airlift function is connected to said another arm of the U-shaped pipe-piece situated in the main reactor; and wherein there is a transfer opening, disposed in the partition wall a certain distance from the lower end of said one arm and the lower end of said another arm, for ensuring the recirculation.