Patent ID: 8293110
Filing Date: 2012-10-23
Classification: C02F,Y02W

Abstract:
1. A method of treating municipal or industrial wastewater in removal of biological oxygen demand (BOD), ammonia, E. coli , and total suspended solids using a minimum of two earthen lagoon cells, comprising the steps of: a. filling a first one of the lagoon cells with wastewater until a first predetermined full liquid level is reached; b. switching the waste feeding to the second lagoon cell which is at low liquid level; c. isolating the wastewater within the first lagoon cell to maintain the aerobic reaction conditions of the cell resulting in the accumulation of sludge in the first lagoon cell; d. drawing down the treated wastewater from the first lagoon cell, when the second lagoon cell is reaching the predetermined full liquid level, until a first predetermined lowest liquid level is reached; and e. without removing the sludge, repeating in sequence the filling, isolation, and drawdown steps.