Hadley's raise their Recycling Rates by investing in new DUO Plant.
Alan Hadley Limited based at Sheffield Bottom, Theale was established in 1933 as a family business. Since the early days the company has progressed and expanded dramatically, but the same key objectives still remain.
Believing in sustainable solutions the company is passionate about conserving the planets natural resources; acknowledging the responsibility they have to the environments in which they operate. The company operate an ethos of utilising the latest technology and integrated processes, which coupled with their highly motivated and technically competent employees has enabled them to deliver first class waste management solutions.
With the key aim of business growth, Hadley's have a firm focus on becoming best in class for delivering waste management solutions for their customers; in turn creating value for all of their employees, shareholders, the public, customers and industry partners. From a business objective perspective their primary concern is the growth of the business by either organic or acquisition with constant integration and development of longer term relationships with customers.
Also high on the agenda is a constant desire toward the development of higher quality recycling materials within their operating area interfaced with a consistent reduction in operating costs the company has recently invested in a new Aggregate Washing Facility.
The new Aggregate Washing Plant supplied by DUO Equipment of Coventry is situated at the company's Moore's Farm site in Pingewood. The new plant will provide the company with the ability to raise their recycling rates and divert more of their waste from landfill. The prime objective of the new investment will be to recycle excavation waste from construction sites into various grades of high specification recycled aggregates with the ability to produce five different aggregate products from inert excavation waste (muck) from construction sites.
Production process:
Material is fed via loading shovel to a feed hopper which is fitted with a vibrating head and variable speed drag out belt. All +125mm oversize material is rejected to ground whilst the -125mm material is fed onto an inclined conveyor which is rated at 200tph.
From here the -125mm material is fed onto a 16 x 5 rinsing screen. Any material greater than 40mm is rejected and sent to stockpile via a conveyor; all -40mm material is fed to a Powerscreen Powerscrub, over a dewatering screen and then conveyed via an inclined conveyor to a 16 x 5 screen. This dry screen grades the material into three sizes of 10mm, 20mm, and 40mm which are conveyed and stocked by three further conveyors.
All waste water from the Powerscrub is then sent over a dewatering trash screen where all foreign materials are removed from the system and stocked via conveyor with the water/sludge being collected into a sump tank.
The water/sludge material which is collected in the sump tank under the Powerscrub is pumped to the Fines Master 120 and any waste water from the Fines Master is then passed over a dewatering screen where any lightweight foreign materials are removed from the system and stocked via conveyor. The dewatered sand from the Fines Master is then delivered via conveyors providing two stockpiles of fine and sharp sand.
The treated waste water from the sand classification unit is pumped into the top of a deep cone thickener and sampled. Simultaneously, the batching pumps inject the flocculent solution into the delivery pipe; as a result, inside the thickener tank, the sludge will drop while the clean water weirs over the top of the thickener into a clarified water tank and is reused by the wash plant, an operator only has to add the powder to a storage bin The underflow from the thickener is discharged into the nearby lagoon.
The five aggregate products produced by the plant are:
- 0/2 Building sand
- 0/4 Sharp sand
- 4/10 Aggregate (10mm single sized gravel)
- 10/20 Aggregate (20mm single sized gravel)
- 20/40 Aggregate (40mm single sized gravel)
20mm all in concrete ballast (0-20mm) is also produced by mixing of the various products. 40-100mm oversize material is also available consisting mainly of brick & concrete which makes an ideal substitute for hardcore. Hadley's technical department can also cater for special requirements which can be satisfied by the controlled mixing of the various products. Products produced from oversize materials & demolition waste by further processing at their crushing facilities are Type 1 crushed concrete (Unbound mixture for sub base SHW clause 803) and 6F5 crushed masonry (SHW Series 600).
Tight specifications and quality control ensure that all products are thoroughly tested to ensure they all conform with the relevant European standards as follows:
•BS EN 12620 (aggregates for concrete)
•BS EN 13139 (aggregates for mortar)
•BS EN 13242 (aggregates for unbound use)
•BS EN 13285 (Unbound mixtures)
Products are also tested against the requirements set out in the Highways Agency Specification for Highway Works (SHW) for use as Pipe Bedding, Drainage Materials, Sub bases & Earthworks materials. With strict quality control systems and regular (weekly) testing in their laboratory all Hadley recycled aggregates comply with the requirements of the WRAP quality protocol.
