Holystone Invests Over £1 Million on New Waste Separation System from Blue
- 28 April 2009
- Company & Industry News
Holystone Limited, with headquarters is Wallsend,
Holystone Limited is the specialist waste management and recycling company within the multi-disciplined Holystone Group, whose interests also include civil engineering and property development, plant and skip hire, demolition and earthworks. Sourcing construction, industrial and black-bag trade waste from both its own Group contracts as well as other organisations in the region, Holystone is reporting around 90% reclamation with the new plant from the total incoming volumes of raw waste. Managing Director Kieran Geoghegan said “Holystone is in a strong position to make an investment of this magnitude, so we can comfortably meet the new landfill initiative well in advance of its scheduled implementation in 2010. We’ve already seen the benefits of air separation and” he continues, ”with the Nihot equipment at the heart of our new plant from Blue, we are experiencing a faster, cleaner and more efficient separation of the varied waste streams than we’ve ever seen before”.
The recycling plant combines a number of separating, screening, conveying and sorting units from the wide range of world-class products marketed by Blue. This new plant largely replaces tandem Doppstadt machines previously sourced from Blue but, with waste streams changing and evolving over the past months, these have proved to be unsuitable on their own, although they do now form an integral part of the plant in pre-treatment and shredding. The plant’s potential capacities are up to 80 tonnes per hour of C&I (Construction & Industrial) and 50 tonnes per hour for trade waste.
Designed and constructed by Blue to comply with Holystone’s large existing under-cover facilities, the new recycling plant combines compatible equipment modules from Nihot and Kiverco, with a series of free-standing feed, transfer and discharge conveyors providing the essential linked materials flow for the processing equipment, the two picking stations and for stockpiling some of the varied recyclables. Overband magnets for tramp metal removal have been strategically installed to ensure ferrous metals are safely and efficiently removed throughout the separation process.
Primary shredding and screening is carried out by the two Doppstadt machines already owned by Holystone. A mobile DW-3080K pre-shreds the waste, reducing it to -250mm with a 1025 static trommel screening out the fines to -25mm. The resulting 25-250mm material then feeds to the Nihot air separation system, starting with an SDS 1200 single drum separator which separates the heavier material for onward conveying past an eddy current from the lighter fraction being blown over the splitter drum. Heavy material is conveyed to one of the two-bay Kiverco picking stations where waste and wood are sorted out, leaving stone and glass to pass through for eventual crushing. The separated lighter materials pass through the Nihot Windshifter, which extracts the RDF (Refuse Derived Fuel) fraction and allows the mid-sized materials to continue on to the second Kiverco picking station. Here, Grade A wood and recyclables are sorted and picked, leaving biomass woodwaste to convey to the stockpile.
The Nihot SDS single drum separator and Windshifter are ideal for the secondary and tertiary separation in this plant. The Nihot SDS uses controlled air to separate waste input into two fractions – heavy and light, passing on the lighter materials to the Windshifter for further separation. Comprised of a combination of recirculation fan, a separation section with a splitter drum and a connecting expansion chamber, the SDS single drum separator can process varied waste streams, including those with high moisture content and large fraction sizes such as plastics or foils. The Windshifter also uses a controlled air principle for greater separation of the light fractions and this is also equipped with dust filtration.
This versatile recycling system is contributing greatly to the production of clean end products for Holystone as well as ensuring maximum reclamation and minimum landfill waste residues. The company reports that, from its incoming raw waste mix of 75% construction and industrial materials and 25% black-bag trade waste, they are recovering 30% fines and 60% wood, aggregates, RDF and metals, with only around 10% non-recyclable material left over after the process.
This combination of modern recycling equipment technology from Blue Group with their industry-specific expertise has produced an ideal solution for their long-standing customer Holystone, who expresses delight at the new plant’s performance and productivity.