Patent ID: 7854842
Filing Date: 2010-12-21
Classification: C02F,Y02W,Y10S

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, and monitoring levels of at least one of ORP and pH and a content of at least one of ammonia, phosphorus, and nitrate in the drawn-off portion to optimize further treatment of the waste stream while minimizing sludge yield, wherein (i) during the controlling step, there is no flow from the off-line treatment vessel to the first treatment vessel, and (ii) the off-line treatment vessel sequentially subjects the entire drawn-off portion within the unitary uncompartmented tank to both aerobic and anaerobic or anoxic conditions, and wherein the controlling step comprises the steps of: