To remedy any odor problems caused by the treated materials, in addition to the processing in depression, the biological deodorization technology will be adopted by means of the MonaShell® biotrickling filter, made by one of our partners. Thanks to this system, the qualities of the counter-current washing are combined with those of a biological filtering system. The operation is similar to that of a percolating filter in which, however, the percolating agent is not the substance to be purified but the purifying agent.
In fact, this is an aqueous solution activated with special microbial strains which metabolise the odor molecules by setting up on the large surface of the special MonaShell® support.
MonaShell® biotrickling filters have the advantage of being able to treat high concentrations of pollutants and allow the application of high specific loads with a consequent reduction in the volume of the filter bed and the surface used.
Furthermore, thanks to the use of selected bacterial strains, the system adopted is able to effectively attack complex organic molecules, to the point that it has been successfully used in industrial applications for the reduction of VOCs such as painting booths, the plastic industry, petrochemical plants. The MonaShell® system is very tolerant of fluctuations in pollutant concentrations as it manages to metabolise the nutrients present in the washing solution in the absence of those normally present in the exhausted aeriform.
In all conventional biofiltration systems, the biological conversion of H2S involves the production of sulfuric acid (H2SO4) which, if accumulation is allowed, determines the acidification of the filtering support material, with consequent reduction of abatement performances. MonaShell® is a biological system that uses a filtering material capable of controlling pH variations by neutralizing the acids that are produced as a result of the biological oxidation of the sulfur compounds. In this way it is possible to treat high levels of H2S and reduced sulfur compounds. The maintenance of the optimal pH on the surface of the filtering material also allows the collection and breakdown of reduced sulfur compounds with low solubility, such as alkyl sulphide and mercaptans. Filtering material The MonaShell® filtering material consists of shells covered with a culture of specifically selected microorganisms. The shells have a high content of CaCO3, which neutralises the acidity generated by the bacterial oxidation of sulphides. Bacteria are selected based on their ability to degrade high concentrations of H2S.
The process is further improved by the physical, structural and chemical characteristics of the material, thanks to which it is possible to create filters of reduced dimensions, having high efficiency and high removal capacity. The process is also extremely effective for the treatment of VOCs and nitrogen compounds. Plant solutions MonaShell® can be supplied both in the form of transportable modular units and in the form of filters built on site on a concrete base. The containment basins are built using bolted panels, made using materials resistant to acid aggression.
All filters are supplied complete with grating for air diffusion, filter material, irrigation system, cover, inlet and outlet connections and inspection accesses. The covers are removable to allow replacement of the filter material. The irrigation nozzles are accessible to allow cleaning and maintenance. All internal components are built using materials characterized by high corrosion resistance.