Patent ID: 7105091
Filing Date: 2006-09-12
Classification: C02F,Y02W

Abstract:
1. A method of treating wastewater, the method comprising the steps of: conducting wastewater to a treatment vessel for treatment comprising contact with a first biological population having a first-biological population profile 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 treatment vessel; drawing off a second portion of the separated activated sludge and adding that second portion to at least one off-line treatment area; controlling the off-line treatment area so as to produce, in the off-line treatment area, a second biological population having a second-biological population profile different from the first-biological population profile; and returning at least a fraction of the produced second biological population to the treatment vessel, wherein the second biological population achieves lower solids levels.