The plant material which generally originates from the maintenance of green areas and waste from foresting operations, is collected and transported to the 'ecological island'.Then the green portion is shredded.The shredding is performed by a mobile hammermill shredder in a defined area and is indispensable in reducing the duration of the decomposition process to a satisfactory amount of time.In order to promote the immediate initiation of the composting process and limit the formation of anaerobic zones which release unpleasant odours at the time of handling, the shredding operations take place immediately, especially when there is a large amount of damp, grassy waste portions.
The preparation of a good mixture (green cuttings and woody parts) is particularly important in terms of physical structure, since the woody part causes the mass to be permeable to the air.This favours natural ventilation and limits the number of turnings.
Thanks to the shredding
processes, the compost is piled ready for the subsequent processing steps with an adequate physical and chemical composition and a sufficiently porous physical structure for all periods of the year.The piles undergo a biological stabilisation period of no less than 90 days.The size of the pile is managed in such a way as to limit the volumes occupied and to allow a constant supply of oxygen. This is so that, during the compost maturation process, proper aerobic balance is ensured between the oxygen consumed by the organic biodegradable portion and the oxygen supplied from the outside.
During the stabilisation period, the material is turned over periodically to maintain aerobic balance inside the mass that is being composted.Thanks to the work of the blades it is possible to both aerate - oxygen supply is essential to keep the aerobic decomposition process active and to complete the natural bio-oxidation process - and disaggregate, stir and mix the material.The compost obtained at the end of the biological stabilisation, is a dark coloured, dry and coarse grade of earth.Next is the process ofmechanical sieving through a sieve with a rotating drum and variable mesh from 10 to 50 mm or through a sieve with a three part motorised star-shaped function.The result of this process is a biologically stable fertiliser, with the aroma of forest soil, in accordance with current legislation in Italy is known as:green waste compost amendment (ACV).