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Composting plant in Ozzano Emilia
Via Cà Fornacetta 3, Ozzano Emilia (BO)
Composting
Green and lignocellulosic waste
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Composting plant in Ozzano Emilia
Via Cà Fornacetta 3, Ozzano Emilia (BO)
Composting
Green and lignocellulosic waste
-
Composting plant in Ozzano Emilia
Via Cà Fornacetta 3, Ozzano Emilia (BO)
Composting
Green and lignocellulosic waste
Overview
The composting plant handles the treatment of green waste from the maintenance of public and private parks and gardens.
Through the composting of lignocellulosic waste from the maintenance of private and public green areas, the plant produces and enhances two types of finished products. The entire process is managed through two material recovery lines: that of composting, the result of which is green composted soil improver, and that of biomass production for combustion.
Page update 5 December 2022
- a first stream consisting of coarse ligneous parts (>90/120 mm), reusable as an inoculum for fresh piles or as combustible biomass;
- a second stream consisting of coarse ligneous parts (15/25 - 90/120 mm), which can be reused as an inoculum for fresh piles or as combustible biomass;
- a third stream consisting of intermediate material (6/8 - 15/25 mm) which can be reused as an inoculum for fresh piles or as combustible biomass;
- a fine fraction (<6 mm and/or <8 mm) made up of the green composted soil improver;
- an exit fraction composed of inert material and plastics stored in the appropriate bays.
The material intended for the composting line is delivered to the authorised area to be grinded. It leaves the grinder and goes to building B for the first treatment phase where forced air insufflation takes place under a pile and the suction of exhaust airs are sent to the dust extraction system (cyclone) and the dedicated biofilter. The leachate is conveyed to the dedicated tank by the collection ducts and can be reused for wetting the piles in building B (possibly integrating with rainwater). The entry and exit of the material from the building takes place on two opposite sides in order to start the next curing phases in the yard on the material that has been the longest inside the building (approximately one month).
The material extracted from building B is transferred to the yard and arranged in trapezoidal section piles, where it remains for an average time of about 3-5 months.
The division of the material on the yard takes place in piles: pile 1, in which the second phase of the composting process of waste grinding takes place; pile 2, in which the third phase of the composting process of waste grinding takes place; pile 3, in which the fourth phase of the composting process of waste grinding takes place; pile 4, in which the composting process ends.
Every day the temperature of the piles is checked, a temperature above 55° is an indication of good composting bacteria activity, lower temperatures can be an indication of poor bacteria activity of which the causes can be:
1. low humidity of the pile (optimal humidity between 45 and 55%). The quantity of water inside the mass is regulated by wetting the material with the rainwater recovered from the composting area.
2. anoxic environment of the composting mass. The composting mass receives oxygen when it is turned.
Action is also taken if the temperature exceeds 70°C, at which point the piles are turned because too high a temperature slows down the microbial activity.
Once the process is finished, the material is sent to the refining section, close to the biomass production line, from which the following fractions can be obtained:
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