Patent ID: 7850850
Filing Date: 2010-12-14
Classification: C02F,Y02W

Abstract:
1. A method of treating a waste stream, the method comprising the steps of: a. conducting at least a portion of the waste stream to a first treatment vessel for treatment comprising contact with a first biological population having a first population profile; b. drawing off a portion of the waste stream to an off-line treatment vessel comprising a unitary uncompartmented tank; and c. controlling the drawn-off portion of the waste stream in the off-line treatment vessel so as to establish, in the drawn-off portion, a second biological population having a second population profile different from the first population profile by sequentially subjecting the entire drawn-off portion within the unitary uncompartmented tank to aerobic conditions followed by anaerobic or anoxic conditions, wherein during the controlling step, there is no flow from the off-line treatment vessel to the first treatment vessel, wherein the step of sequentially subjecting the drawn-off portion to aerobic and anaerobic or anoxic conditions comprises (i) at least one accelerated cycle of achieving a predetermined aeration intensity level followed by reducing oxygen levels to anaerobic or anoxic conditions, and (ii) an extension of at least one accelerated cycle in the waste stream in the first treatment vessel.