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OMS Biocombi

This installation is used for the treatment of wastewaters from communal networks, towns and cities, with capacities above 2000 m3/day. The capacity of the Biokombi wastewater treatment plant can be modified to fit the local needs. In systems with OMS technology, the microorganisms producing the aerobic decomposition of the organic matter are supplied with oxygen through the deep aeration system with elastic membranes, which pumps ultra-fine air bubbles into the tank. The patented OMS aeration system ensures that the active sludge receives the optimal air quantity. In the '60 OMS designed and developed its diagonal aeration system which allows the aeration process to work independently of the circular movement of the water within the biological treatment tank.
Through the elastic membrane aeration system, the air is introduced into the tank in ultra-fine bubbles, which influenced by the movement of the submersible mixers ensuring water circulation in the biological treatment tank, trace a diagonal path while slowly emerging to the water surface.
Combined, the aeration system using  ultra-fine air bubbles and the system for tank water circulation ensure high efficiency aeration (the oxygenation efficiency exceeds 3,00 kg O2 /kWh). The elements of the aeration system are not fixed onto the tanks. They can be raised or lowered manually or mechanically by winches, and it is even possible to completely remove them from the biological treatment tank. Thus, verification, maintenance and reparation can be carried out on the aeration system elements without interrupting the purification process.
Since the circulation of the active sludge doesn't depend on the aeration system, it is possible to only carry out aeration periodically,  a  more economical aeration routine, the energy consumption can be considerably reduced, and new possibilities of treating the water concurrently with the denitrification (nitrate removal) process also emerge.
The nitrification and denitrification processes are in the same place , but at different moments in time, therefore there is no need to use separate tanks for these processes. These systems are based upon the time separation of the anaerobic life conditions for the bacteria, and permit approximately 50-60% biological phosphorus removal. The remaining phosphorus content of the water is reduced within the allowed limits through simultaneous chemical treatment.
Periodical aeration is carried out with the help of equipment which measures the dissolved oxygen content, ensuring that the oxygen supply corresponds to the organic matter content of the wastewater. With specific energy consumption values between 0,35-1,1 kWh / m3  this solution is  more economical than other aeration systems.
Thanks to the probes for dissolved oxygen content measurement, the operation mode of the aeration system can be adjusted to fit the changing organic matter content levels of the  treated wastewater.