In any type of biological oxidation process the air-water exchange ensures to the biomass the oxygen necessary for the development and maintenance of metabolic processes, for the oxidative demolition of the pollutants.
The process named “Dispersed micro-biomass” applied by FIDIA Engineering Srl uses specific ejectors able to atomize the water particles with diameter less than 25 μ, thus ensuring intimate contact between air and water, facilitating the diffusion of oxygen into the liquid.
The wastewater to be treated is recirculated in the tank at a pressure of about 8 bar through a series of ejectors specifically dimensioned. The ejectors are installed so as to allow the mixing of the liquid and therefore do not necessitate the installation of any mixer.
The residence time less than 24 hours and high oxygenation of the water allow the growth of suspended micro-biomass, responsible for the degradation of pollutants.
The process air is sucked directly from the ejector by means of a flexible pipe at the basin's side.
The dispersed micro-biomass system it is well applied to tanks that require equalization to reduce the organic load to the subsequent treatment sections, or as a real treatment plant for wastewater that exceed the limits in a limited way to the waste, in particular about parameters such as COD, BOD, surfactants, sulfides and sulfites.
1) Automatic operation with reduced demand for inspection, as well as reduced routine maintenance and repairs . All parameters are controlled solely by centrifugal pumps supplying water to the ejectors;
2) Microbiological purification without the need of mud control, with no influence on the purification process in case of change about the pollutant load, including components normally "toxic" for activated sludge processes such as sulfides, sulfites, surfactants, etc;
3) High yield for the treatment of any type of surfactant (anionic, cationic and non-ionic);
4) None production of sludge to be disposed of;
5) Ability to shut off the wastewater supply without any influence on the purification process. Does not exist the need to preserve the biological masses to ensure the restart of the purification process;
6) Reduced space requirements if compared to a conventional activated sludge plant;
7) No need for pH correction, because the biological process automatically adjusts the pH to values close to neutrality.