Biostabilisation Porto Azzurro
Elbana Servizi Ambientali E.S.A. SpAPorto Azzurro | Isola d'Elba - Italy
- System description: Biostabilisation
- Waste processed: Organic waste
- Plant capacity: 77 t/day
ESA has chosen a composting technology based on the aerated static pile covered by a breathable membrane and has awarded the construction contract to Ecomaster. ESA owns and operates a treatment plant that receives solid waste generated by the municipalities which are shareholders of ESA. Ecomaster is leader of a temporary joint-venture that also includes the civil contractor Impresa Edile Odino Petrocchi, which has been contracted by ESA for the construction of the stabilisation system of the waste organic fraction sorted in an adjacent sorting plant. The composting plant is located in an existing building that is transformed according to the same construction contract of the composting plant. The composting plant includes eight open biocells, each segregated on three sides by concrete walls and provided with an air distribution system cast in the concrete floor. After formation of the pile, the biocell is covered by a breathable membrane, which lets the process air pass through, but holds moisture, spores and bacteria. The membrane also controls the odours generated by the composting process. In order to have the maximum odour filtration efficiency, the building is served by an existing biofiltration system, which processes the waste air before it is exhausted.
Each biocell is provided with a variable speed electric fan, which blows external air into the floor of the biocell. The temperature of the composted material is measured and recorded by the computerised system controlling the fans. The plant is complete with a leachate control system, that is collected in two tanks and sent to safe disposal. In addition to the organic fraction of mixed waste, the plant can also process source separated organic waste, which is mixed with an dequate quantity of structural material having a controlled particle size. The compost produced from source separated organic waste is matured and refined in other areas excluded from this contract. The final compost product derived from source separated waste can be used in agriculture.