The traditional glass recycling strategy is led by the perception that 100% of waste glass collected can be used to manufacture new containers.
This is closed loop recycling.
To achieve this and its implied carbon savings against the use of virgin materials, all factors must be considered, such as: quality of glass, location, cost, size, colour and carbon footprint. Closed loop recycling requires all cullet to be preconditioned for colour, quality and size.
But this process is being challenged by new technologies, knowledge, carbon saving targets and cost efficiency pressure.
In partnership with Machinex in North America and RDT in Australia, Krysteline Technologies has been offering its glass processing systems which are designed for the recovery, cleaning and refinement of 100% of collected glass, no matter what its size, location, quality or volume.
Krysteline’s approach can integrate seamlessly into single- or multi-stream MRFs, kerbside and commercial collections. The technology has evolved along with the ever-changing global glass recycling market.
Krysteline’s technology focuses on the removal of contaminants before refinement. This is achieved through a variety of processes which eliminate non-glass materials and improve the efficiency of all downstream processes. This can include colour sorting, screening and resizing where required.
The company’s imploders and revolutionary Pyro Drier are at the heart of its approach to producing a consistent quality of cullet throughout all sizes and marketplaces.
The system offers industry the potential to recover 100% of all container glass arisings. Glass is recovered with the lowest possible carbon footprint in sectors such as container production, glass fibre, foam glass, water filtration, grit blast and construction products.
It is becoming increasingly apparent that there is no cost-effective one-size-fits-all strategy for global glass recycling. All factors along the recycling chain must be considered on the merits of carbon footprint and commercial viability, from producer to final destination.
Industry must continue to evolve its strategy and technology to ensure the sustainability of integrated recycling solutions for all glass, no matter what its intended end market.
Case Study: Australian MRF uses the technology
In Queensland, the Mackay Township’s strategy was to decrease the cost of glass collections through inclusion of glass in the commingled waste stream and to add value to the material produced.
Mackay’s remote location determined its strategy, mainly due to high haulage costs. Feedstock quality was low because of contamination from commingled collections. Clean-up of the glass required specialised technology to be installed in the MRF to reduce the glass size, to ease its recovery from non-glass contaminates.
Krysteline offered an imploder for size reduction and liberation of glass from the non-glass, a taper slot scalping screener for separation of non-glass contamination by size and an additional gyratory screener for segregation of recovered glass into various sand grades. Light fraction material was also removed from the gyratory screener via flexible nozzles and an air extraction system. The glass sands were either bagged or bulked for distribution.
The Krysteline system offered significant improvements in glass quality while recovering non-glass materials for further recovery. Local contractors have committed to all available tonnage from the Mackay MRF, making this a low-carbon, compact and sustainable processing solution.
The processed glass sands from Krysteline systems are suitable for a variety of applications, from aggregates and grit blast media to high-quality water filtration media and specialist sands and powders. In this example, most is being used in asphalt and expendable abrasives.
Steve Whettingsteel is chief executive and managing director of Krysteline Technologies