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Glass recovered from municipal solid waste streams represents a significant untapped resource – if it can be sorted to the purity that glass manufacturers require.
Most discussions of glass recycling focus on dedicated bottle banks and separate glass collection – and for good reason, since this remains the primary source of high-quality cullet. But significant volumes of glass also end up mixed in with general municipal solid waste (MSW), where recovering it presents a different set of challenges.
Where dedicated glass collection systems are well established, recycling rates tend to be high and the resulting cullet is relatively clean, requiring less intensive sorting before it can be used in new glass production. Glass that ends up in mixed MSW, by contrast, is typically broken, contaminated with other waste materials, and far harder to recover economically.
Spain's glass recycling performance contributes meaningfully to the broader European picture, though – as with recycling more generally – there remains a gap between Spain and the highest-performing countries, partly reflecting differences in how comprehensively glass is captured through dedicated collection versus ending up in mixed waste streams.
Every tonne of cullet used in glass manufacturing reduces the energy required compared with using virgin raw materials, since cullet melts at a lower temperature than the sand, soda ash and limestone used to make new glass from scratch. Maximising glass recovery – including from MSW streams where feasible – therefore has a direct energy and emissions benefit, on top of reducing the volume of glass sent to landfill.
Recovering glass from mixed MSW requires sorting technology capable of identifying glass fragments – often broken and contaminated – within a much more heterogeneous waste stream than dedicated glass collection produces. PICVISA's ECOGLASS systems are designed to separate glass by colour and remove non-glass contaminants, and can be configured to handle the more challenging input streams that MSW-derived glass represents, helping facilities recover material that would otherwise be lost to landfill alongside the rest of the mixed waste.
Discover ECOGLASS optical sortingGet in touch with our team to discover how PICVISA's optical sorting and robotics solutions can fit your recycling operation.