New composting system for animal by products

Covered Systems has launched an in-vessel composting system,for the composting of Category 3 Animal by Products.

Covered Systems has launched an in-vessel composting system, with a pioneering air distribution and a steam jetting system that guarantees compliance with the EU treatment standard of 70°C for one hour for the composting of Category 3 Animal by Products.

The prefabricated concrete structure has a biological filtration, and its innovative design includes a venting system that is set within the floor of the sectionalised building, efficiently sucking air from the decomposing material, increasing circulation, retaining moisture and speeding up the composting process.

The first operational facility has recently been commissioned at Eco Composting Limited which owns and operates one the UK's leading purpose-built composting and recycling sites in Dorset.

"We already had a small in vessel system, which we used for catering meat waste. We had several operational problems with the original design but wanted to satisfy the increased demand for our in-vessel facility," said Eco-Composting managing director Trelawney Dampney. Covered Systems designed the horizontal building which is 24m long, four metres high to the eaves and eight metres wide. Waste is fully enclosed and composting takes place inside the modular chamber. Sectionalised construction makes it easy to assemble and as ground foundations are unnecessary it can be sited almost anywhere.

The vessel is constructed completely of concrete to avoid corrosion problems. The walls, three-metre Alfabloc reinforced concrete walling, are connected using threaded inserts. They are anchored into the floor and fixed together with a galvanised steel plate; this provides a seal between the joints.

Eco Composting requires an optimum working temperature of 70°C to be maintained in order to eliminate pathogens. This is sustained using computer controlled venting, by means of fans which suck fresh air through horizontal pipes on the floor, beneath the composting material. When necessary, jets can introduce steam into the compost mass to make sure the compost reaches the 70°C temperature for one hour throughout the total mass.

Exhaust fans then suck the air out and through a bio filter and microbes on the organic material convert odorous gases to carbon dioxide and water. A leachate chamber collects any moisture from the air channels; this is then re-introduced into the compost which helps maintain the optimum moisture conditions.

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