Patent ID: 8845900
Filing Date: 2014-09-30
Classification: C02F,Y02W,Y10S

Abstract:
1. A method of treating wastewater, comprising: conducting wastewater to an on-line treatment vessel; maintaining the on-line treatment vessel under aerobic conditions; combining the wastewater with a first biological population having a first biological population profile in the on-line treatment vessel to produce a mixed liquor including activated sludge; separating the activated sludge from the mixed liquor; drawing off a first portion of the separated activated sludge and returning said first portion to the on-line treatment vessel; drawing off a second portion of the separated activated sludge and introducing the second portion to an off-line treatment tank; controlling the off-line treatment tank so as to produce, in the off-line treatment tank, a second biological population having a second biological population profile that is different from the first biological population profile; and returning at least a fraction of the produced second biological population to the on-line treatment vessel.