McCloskey Trommels Tackle Mixed Waste at Envar
A pair of McCloskey 621 trommel screens is helping a Cambridgeshire-based company convert a mixture of food and green waste products into a valuable and sought after agricultural compost.
Waste management and materials resource specialist Envar is using two McCloskey 621 trommel screens to divert a variety of green, domestic and industrial wastes from landfill, converting them instead into a valuable compost soil enhancer for the agricultural industry.
Mixed Waste Stream
Part of the ADAS Group, the UK’s largest independent provider of environmental consultancy, rural development services and policy advice, Envar is the waste management and recycling division and specialises in organic waste and recycled product development.
Established in 2000, Envar has pioneered innovative and viable markets for recycled products that have a clear benefit to the environment as well as saving money for its clients. The company’s philosophy is neatly summed up on its advertising material: Where others see waste, we see a resource.
Envar currently recycles green waste, food waste, cardboard and paper waste, industrial bi-products, effluents, sludges, even crumbs and cakes. The company also handles a bewildering array of waste products from industrial and manufacturing processes, including abattoir wastes, sewage sludges and ash from electrical power generation. Envar’s clients include local authorities, paper mills, and food manufacturers, utilities, supermarkets, and even fellow waste management companies.
Waste materials arriving at the 11 hectare Woodhurst site near Huntingdon is stored for between eight and 12 weeks, being turned regularly until the material is rotted down sufficiently to be processed further. Inside the 60 metre long covered processing sheds that together cover an area of around 5,500 m2, two McCloskey 621 trommel screens steadily work their way through the huge pile of waste to produce a 15 mm compost used as an agricultural soil improver. Site Supervisor, Richard Atcott expressed his thoughts on the two machines.
"The McCloskey machines have been here longer than I have - which says a lot for their build quality - roughly five and six years apiece,” says site supervisor Richard Atcott. “The original machine was brought in to manufacture compost and proved so good that a second was purchased to supplement it a year later."
The two 28 tonne McCloskey 621 units are each teamed with a Komtect Hurrikan windsifter. The 621s screen out all the >15mm material, passing all the oversized back to the windsifter which removes the plastic and paper. The remaining material is treated and returned to the stockpiles before going through the system again at a later date.
"The McCloskey’s are excellent screens," Atcott asserts. "The end product is brilliant, and we have a ready market for it as a natural, organic soil improver. The compost is clean and free of foreign objects. In fact Envar is currently exploring reducing the size of the screens, and the subsequent end product, down to 10 mm and then applying for a new specification licence to allow entry into new commercial markets. As farmers are turning away from fertilisers and chemicals because of customer and environmental demands, we can supply the perfect alternative."