Larger systems are custom designed for villages and small cities' applications reaching the multi-hundred thousands cubic meters per day capacities.
 

The above specifications are based on the following:
 

U.S. Corps of Engineers and the United States EPA Guidelines for Extended Aeration Systems.
 

Peak Flow at 3 times the average flow.
 

Raw sewage from human waste (For industrial waste streams, please ask about EBD industrial wastewater treatment systems).
 

Raw sewage parameters of 240 ppm BOD and 300 ppm S.S.  (BOD up to 400 ppm and SS of 500 ppm can be treated with certain system modification).
 

Twenty Four (24) hours retention time in the aeration tank [ Design ranges from 18 to 36 hours based on BOD levels].
 

Two streams operation to provide flexibility, handling low flows and improving efficiencies.
 

Gravity clarifiers with 1.5 m³/m²/hr rise rate [Design ranges from 1.0 to 1.8 m³/m²/hr] and 4 hours retention time [Design ranges from 3 to 4.5 hours].
 

Aerated Sludge digestion tank for 15 days retention time.
 

Chlorine contact tank for 45 minutes retention [design ranges from 30 to 90 minutes].
 

Electric characteristics: 230/460 V, 3 PH, 60 HZ as standard [380 V, 3 PH, 50 HZ available].
 

Below ground or above ground installation is possible.  Welded steel packages are provided with magnesium anodes for cathodic protection.