Bio Filtration System Notaresco
SOGESA SpANotaresco | Teramo - Italy
- System description: bio-filtration system for composting plant
- Waste processed: organic waste
- Plant capacity: 18,000 - 25,000 cu.m/h
The air exhausted from an organic waste composting plant is conveyed into the bi-filtration section, where the odours are controlled before the cleaned air is released to the atmosphere. The operations regarding the creation of three bio-filters:
F1) intensive composting;
F2) maturation process (25,000 cu.m/h);
F3) organic material storage (18,000 cu.m/h).
Bio-filtration is a very efficient process for controlling odours produced by the organic degradation of an organic substance (composting). The process involves two phases: initially the malodorous gasses are absorbed by the surface moisture of the bio-filter mass and subsequently are digested by the organic activity developed spontaneously on the mass itself. Both processes of absorption and digestion of the gases take place in the presence of water and therefore it is undamental to ensure that there is a certain level of moisture in the filter mass, that consists of wood chips. On the surface of the chips a watery film is formed biofilm), in which the entire process takes place. A centrifugal ventilator located outside the building exhausts the waste air through an air duct installed under the ceiling. The air to be processed is conveyed to the construction containing the bio-filter mass. The action of the ventilator allows for the capturing of the malodorous air and, at the same time, fresh air is sucked into the building. The ventilator is equipped with a motorised damper that is closed during the starting phase to reduce the power absorbed. The floor of the bio-filter is made of prefabricated reinforced concrete slabs with a structural resistance sufficient to bear the load of a wheeled loader; this feature makes the maintenance of the bio-filter easy. The slabs are perforated to allow for the passage of air that comes out of the plenum underneath. The plant includes a water spraying system to maintain constant the moisture of the bio-filtration mass.