Patent ID: 8105490
Filing Date: 2012-01-31
Classification: C02F,Y02W,Y10S

Abstract:
1. A system for treating wastewater comprising: a biological treatment system configured to biologically treat a wastewater including a pollutant with a pollutant concentration to produce a biologically treated wastewater and a first sludge and configured to separate the biologically treated wastewater from the first sludge to form a biologically treated effluent containing the pollutant at a second pollutant concentration; a chemical treatment system downstream of the biological treatment system and in fluid communication with the biological treatment system, the chemical treatment system configured to receive at least a portion of the biologically treated effluent from the biological treatment system and to treat the at least a portion of the biologically treated effluent with at least a metal salt to reduce the second pollutant concentration and to produce a second sludge comprising at least a portion of the metal salt; and the chemical treatment system operatively associated with the biological treatment system in such a manner that at least a portion of the second sludge is supplied to the biological treatment system.