The dimensioning of biological waste water treatment plant is in conformity with European norm EN 12255, and is considered BOD5 per day and 150 l of waste water per day.
The treated water has sufficient criteria to exit to the recipient of 2. category watercourses.
Guaranteed outlet values are BOD5 25 mg/l and COD 100 mg/l. They are made in container design.
The device consists of mechanical pretreatment, prepump shaft, two tanks for receiving waste water, which have function as primary settler and as reservoir for excess sludge, and two tanks for activation, which have function as the secondary settler.
They are used for biological treatment of sanitary sewage waste water of small factories, hotels, or whenever the quantity of water and its pollution varies with time. The device can be equipped with equipment for remote control operation.