Patent ID: 6830690
Filing Date: 2004-12-14
Classification: C02F,Y02W

Abstract:
A process for treating organically contaminated waste water having an incoming biochemical oxygen demand (BOD) level, comprising the steps of:initially treating said waste water in the presence of microorganisms capable of utilizing said organic contaminants for microorganism replication, oxygen and support media for the microorganisms, and causing said microorganisms to replicate and thereby reduce said incoming BOD level, with a first portion of the microorganisms adhering to said support media and a second portion of the microorganisms remaining suspended in the waste waters, said initial treatment step being carried out primarily during the log phase of growth of said microorganisms; removing at least a part of said second suspended portion of said microorganisms from said initially treated waste water; and thereafter further treating said waste water after said removal step in the presence of said microorganisms and oxygen to further reduce said BOD level.