Windrows with membrane covers
Application:At some projects the emphasis is placed on a simple, quickly implemented and above all low-cost technical solution for a mechanical-biological treatment (MBT). For such applications we propose a covered windrow with forced positive aeration under a semi-permeable membrane cover. The membrane is a three-ply laminate comprising a base layer with antibacterial coating (PES HT Taslan), a UV-resistant top layer (PES HT Taslan) and the actual breathable membrane as a functional intermediate layer. Compound these three layers provide all the desired properties for covering the windrow: Maximum protection against rainwater, high permeability for water vapour, maximum reduction of odour emissions, handling stability and a long lifespan despite exposure to the ambient.
To increase wear resistance, the membrane is edged on all sides with a particularly durable tarpaulin material to which all the loops and attachments required for handling are sewn. In addition, openings are provided in the centre of the membrane to enable the insertion of measuring probes.
Process:
We offer this technology in the following variants:
Triangular windrows: The simplest form are aerated, covered windrows. Depending on the size of the windrow, the membrane/cover is handled either manually or with a STRABAG winding machine, which winds and unwinds the membrane automatically.
Channel composting: In this variant the membrane is pulled over the retaining side walls and thus provides for a tight seal to reduce emissions from the composting waste and to prevent the penetration of rainwater. The water which runs off the covers can be directed to a drain together with the rainwater from other paved surfaces.
Aeration: The air supply and leachate draining are realised by way of special aeration channels in the floor. STRABAG has developed a proprietary control system to regulate the associated fans in accordance with the substrate properties and the progress of the composting process. The parameters used by the control system are data from oxygen and temperature probes which are inserted into the windrows via special openings in the membrane.
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