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Tue October 20 2020

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Blue Washplant for Central Demolition

9 Dec 10 Central Demolition, based in Bonnybridge in Stirlingshire, has made a significant investment in a new recycling washplant and reports excellent results in increased reclamation of recyclables, end-product quality and recovered fines volumes.

Combining a range of compatible Powerscreen processing and conveying equipment - all sourced from distributor Blue Machinery Scotland - Central Demolition has enhanced its existing modern recycling plant and created a tandem configuration of specialist recycling machines to process large volumes of C&D waste for the production of a wide range of saleable reclaimed materials. Central Demolition is now confident that it is reclaiming between 90%-95% from the thousands of tonnes of crushed demolition waste, inert materials, soils and skip waste fines at its Bonnybridge recycling station. Incoming raw waste materials for recycling and washing are brought in from Central’s own demolition and site clearance contracts as well as other sources throughout Scotland and North East England.

Central Demolition is a multi-disciplined organisation specialising in demolition and dismantling, licensed asbestos removal, earthmoving, site clearance, plant and tipper hire, landfill and recycling. The company is a member of the National Federation of Demolition Contractors (NFDC) and complies with all the requisite industry standards and techniques. Formed in 1993, Central Demolition has evolved to become a leading national organisation in its specialist fields, with broad expertise in all its activities. The company has always placed great emphasis on investing in the best possible plant and equipment for its various operations and has enjoyed a long and fruitful relationship with Blue Machinery Scotland when it comes to sourcing recycling plants. Managing Director Ross Craig says “We look to Blue Machinery Scotland as our single source solutions provider for all our recycling equipment needs. Blue Group is an expert in its field and we know we can rely on their experience and expertise right from the planning stage through to installation and commissioning. Additionally”, he continues, “we find that their after sales product support through Blue Spares is pro-active, prompt and efficient, keeping any downtime to an absolute minimum”.

Central Demolition has installed a number of linked Powerscreen machines to enhance both primary and secondary reclamation of recyclables from the waste streams. The new plant array consists of a Powerscreen Warrior 800 flat-bed screening plant which is used as a pre-screener, scalping off +50mm materials and 6mm fines. The larger end-product is conveyed on to the washplant system via a Powerscreen 1400 feeder, a 5032 conveyor and an overband magnet for ferrous removal and thence into a Powerscreen Powerscrub 120R logwasher. Here, the incoming material is intensively mixed with blades and paddles in a special trough which produces a friction action to break down the contaminants, allowing the scrubbed material to be discharged, fed onto a rinse screen and then finally passed on to a Powerscreen Chieftain 1400 for separating and stockpiling in 40mm, 20mm and 10mm sized clean recycled aggregates. The contaminants removed by the Powerscrub 120R logwasher, including timber, plastics and other “lights”, are floated off and dewatered on a trash screen ready for sorting and reclamation as appropriate.

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Sand, slurry and dirty washwater – the inevitable bi-product of the washing process – is also further recycled, wasting little in the process. Collected and transferred to a Powerscreen Finesmaster 60, the commingled material is pumped from the receiving sump to the Finesmaster cyclone where clays, silts and slime are removed, with the water being discharged to the settlement ponds for reuse within the washing system. The Finesmaster process produces a cleaner washwater which, through an improved materials recovery, has increased the recyclable material extraction with a corresponding reduction in settlement pond maintenance and the associated costs. Sand from the cyclone is discharged, dewatered and stockpiled by a Powerscreen T 4026 conveyor/stockpiler.

From the large daily tonnages of waste that come into their Bonnybridge recycling station, Central Demolition is able to reclaim an increased range of clean saleable materials, including ferrous and non-ferrous metals, recycled aggregates in various specified sizings, sand, composting, soil improvement and landfill cover materials, board, timber, plastics and paper. Volumes of non-recyclable materials are minimised by the processes, with all the environmental and cost-effective benefits of tip-to-landfill reduction. The new washplant has production capabilities as follows:- 75 tonnes per hour throughput; 10% silt content; 20 tonnes per hour of 10mm, 17tph sand, 15tph 20mm and 15tph 40mm.

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