The device BP ASP 150 N is delivered. The device is designed in accordance with the Croatian standard HRN EN 12566.
Wastewater treatment is achieved by applying mechanical and biological treatment processes. In the primary precipitator, solids are separated from liquids. All degradable solids float to the surface or settle to the bottom of the primary precipitator in which the process of their decomposition begins.
Degradation takes place with the help of anaerobic microorganisms, which multiply rapidly under ideal conditions. This ensures the decomposition of organic solids and their reduction into liquid and inert substances. This is a completely biological process, which in other words means that completely natural bacteria are used for the purpose of decomposition, the effectiveness of which must not be diminished by the use of chemical and other antibacterial substances. The next stage is the aeration that takes place in the aeration pool.
Here, compressed air is blown into the polluted water from the primary precipitator through membrane aerators that create fine bubbles. Oxygen dissolves in water and enables the accelerated multiplication of aerobic bacteria that use dissolved substances from wastewater as food and thus purify it. The required oxygen is continuously supplied by a blower located near the device.
After aeration, the mixture of wastewater, air bubbles and microorganisms goes to the secondary precipitator where the activated sludge is separated from the clarified water that goes into the overflow and exits the device and discharged into the recipient.
The activated sludge is returned to the aeration pool and thus the process is continuously renewed.
After a certain time, part of the microorganisms dies and biomass is created, the concentration of which in the wastewater increases. However, the process is dimensioned so that this biomass is returned to the primary precipitator for final deposition. This procedure reduces the volume of excess sludge and the need to extract it.