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AAL Recycling, United Kingdom – Case Study

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AAL Recycling Limited (AAL), United Kingdom, started more than 30 years ago as a one-man, one-truck, one-excavator company. Established in 1992, it is now one of the largest demolition, hauling, recycling and excavation companies in Jersey and the Channel Islands, employing more than 85 people and with a fleet of more than 70 vehicles.

Currently, AAL operates the island’s commercial and household construction waste recycling centre in La Collette, supporting the island’s sustainability project in every way possible. The demolition and excavation area has had the company’s fastest growth, thanks to managing some of the most complex projects developed on the island in recent times.

AAL Recycling, Impianto completo di lavaggio e selezione, trattamento acque reflue e filtropressa - Matec Industries

Given the great growth of AAL Recycling, its owner, Alan Langlois, approached Matec Industries in order to find innovative and technological solutions that would allow processing up to 150 tons/h of recycled material, with water consumption of less than 25 m3/h.

The plant would have to comply with all current regulations, ensuring low energy consumption, and maintaining a high washing and sorting performance of the processed material.
The complete plant consists of the following modules:

  • Wastewater Treatment and Filter Press
  • Washing and selection

 

Wastewater Treatment & Filter Press

To ensure that more than 95 percent of water used during washing and sand sorting was recycled, a complete wastewater treatment and filtration plant was installed.

Unità di trattamento acque reflue - Matec Industries

Let’s take a brief look at the main functions:
From the collection tank, turbid water is pumped into the decanter through the stainless-steel piping via the use of a centrifugal pump.
The flocculating polyelectrolyte solution is injected into the feed line of the settler and reacts with the suspended solids in the liquid, speeding up the natural sedimentation of the mud particles.
The turbid waters arrive in the vertical decanter where the reaction of the polyelectrolyte takes place, aggregating the sludge particles and causing them to precipitate. The clarified waters free of suspended solids then rise to the top of the decanter and by weir and are collected in the perimeter channel located at the top of the decanter it is then conveyed to a stainless-steel clean water tank. At this point it is ready to be reused in the production cycle again through the clean water relaunch pump.
The sludge, meanwhile, settles inside the cone and is discharged once it reaches the required consistency by the opening of the automatic valve.
It is sent to the homogenizer tank below where it is kept in slow agitation. At this point it is ready to be fed into the filter press.

The MATEC plate filter press is an industrial machine designed to achieve the best results in dewatering industrial or civil fluids (often referred to as sludge).
MATEC filter presses are designed for use with High Pressure Technology (HPT), capable of working at both operating pressures common to all filter presses and at higher pressures.

Unità di trattamento acque reflue e filtropressa - Matec InduustriesThe wastewater treatment and filter press module consist of:

  • Filter press 1500×1500, 170 TT Plates
  • BIFANG – sludge homogenization tank 100,000 litres
  • Static Vertical Decanter 220,000 litres
  • Clean water pump 6,000 LPM
  • Clean water tank 100,000 litres
  • Clean water tank 40,000 litres
  • BIFLOC – Automatic flocculant management system
  • Centrifugal pump for loading Vertical Decanter 6,000 LPM
  • Dirty Water Tank 50,000 litres

 

Washing & Screening

For the washing, grading, and drying the product, the following machines were selected:

 

AGGRETEC 150

Unità di lavaggio e selezione - Matec Industries

Aggretec is Matec’s rapid installation modular washing and sorting plant ideal for a wide range of sectors, including aggregates, recycling, reclamation and mining. Being a semi-mobile system, it is easily transportable making it ideal for working on construction and demolition sites.

  • 3 Conveyor belts (0-2mm, 2-4mm, 25-40mm)
  • Sand recovery unit with hydrocyclones
  • 3 Deck vibrating screens
  • Magnetic belt separator
  • Feeder screen
  • Loading Hopper

 

SCRUBTEC LW-080-500

SCRUBTEC, unità da lavaggio pesante - matec Industries

The combination of intense cleaning action and removal of light contaminants makes the SCRUBTEC a key component in construction and demolition waste recycling systems. It is also ideal for aggregates and mined materials with high clay content.

The material is rubbed through inclined paddles arranged in series inside the machine. These paddles slow down the material feed when it is very dirty, but ease the feed when it is cleaner. The entire washer is coated with an interchangeable wear-resistant steel armour.

  • Log wash
  • Impurity screen
  • Dryer/finishing screen
  • 3 Conveyor belts (16-25mm, 10-16mm, 4-10mm)
  • Pre-Screening

 

CONCLUSIONS

Thanks to the technological solutions of MATEC, today AAL Recycling can process up to 150 tons/h of recycled material with a water consumption of only 25m3/h.

With the achievement of these goals and the expectations of Alan Langlois (CEO, AAL Recycling) fulfilled, we can only be satisfied with the results achieved.

Unità di recupero della sabbia con idrocicloni - Matec Industries
Vaglio vibrante a 3 piani - Matec Industries
Nastro trasportatore - Matec Industries

Once again MATEC, has succeeded in turning a waste into a new resource!

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