lecture 6 recycling
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wasteTRANSCRIPT
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SBT 4635 WASTE MANAGEMENT & USAGE Recycling
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RECYCLING TERMINOLOGY ¢ Source separation – removal of potentially
recyclable materials from the waste stream by individual consumer @ commercial establishment
¢ Reuse – Using an item for its original use. A common example is refilling a returnable soft drink bottle
¢ Recycling – Use of a material in a form similar to its original use. Newspaper: recycled into cardboard or newspaper. Plastic: shredded and manufactured into fabric. Aluminum window frames: new beverage containers
¢ Waste to energy – conversion of MSW into energy by combustion in a controlled incinerator. Energy to heat to electricity
¢ Resource recovery – Extraction of energy or materials from waste. Incorporates all of the above.
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COMMON RECYCLED MATERIAL & POTENTIALLY RECYCLABLES
¢ Paper ¢ Glass ¢ Aluminum ¢ Ferrous metal ¢ Plastics ¢ Yard waste/ Garden waste ¢ Food waste ¢ Tires and rubber
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¢ Recovery for recycling is highest overall compared with all other materials
¢ Paper waste � Bulk grade � High grade
¢ Recycle paper- different pulping process � Removing extraneous material- glue, plastic, metal,
clips � Deinking (mechanical process) � Bleaching
Paper recycling
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¢ Paper recycling – downgrade in quality � Some of the longer fibers are shortened – lose
flexibility, bonding ability � Virgin pulp – added to maintain paper strength � Deterioration of brightness
¢ Other paper markets � Insulation board, fiberboard, roofing � Plant pots, egg cartons, meat trays � Animal bedding Challenge- Construction @ modification of the paper
mills- costly Benefits – reduce space in landfill, tree conservation,
produce less toxic waste compared to production of paper from original tree
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GLASS
¢ Glass is 100% recyclable and can be recycled endlessly without loss in quality or purity - something few food and beverage packaging options can claim.
¢ Most recovered glass is used for the production of new containers
¢ A smaller fraction for other uses – fiberglass, bricks, ‘glassphalt’ ( a mixture of glass and asphalt that serves as paving mixture for highway construction
¢ Modern glass container manufacturing requires clean and uniform feedstock
¢ Four requirements for cullet use in recycling � Must be separated by color � Must be contaminant free � Must meet market specifications � Must be container glass
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¢ Color � Sophisticated optical sorting @ hand-picking � Mixed cullet- lower demand and value
¢ Contamination � Decrease quality and increase cost � Disrupt production, damage manufacturing
equipment, produce poor quality product � Common contaminant- ceramic cups, plates and
pottery, crystal and opaque drinking glasses, mirors, heat resistant cookware (e.g., Pyrex), light bulbs
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BENEFITS
¢ Reduce solid waste brought to landfills ¢ Require less energy for glass manufacturing-
recovered glass waste has a lower melting point compared to standard silica, soda ash and limestone mixture
¢ Hold down manufacturing cost ¢ Fewer gaseous emissions
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Source: EcoIdeal Glass recycling project in Kuantan
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GLASS CULLET
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ALUMINUM
¢ Starting material for primary aluminum manufacture – bauxite ore
¢ Aluminum waste ¢ Industrial scrap- by product of aluminum
manufacturing process (new scrap) ¢ Post – consumer items: beverage cans
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FERROUS METALS
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PLASTICS
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¢ Product from recycled plastics � Fences � Signposta � Flowerpots � Toys � Compost bins � Recycling container � Containers for non-food products
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TIRES AND RUBBER
¢ Relatively inert and may not necessarily need land disposal to limit any hazards
¢ Product of recycle rubber, tyres: � Playground cover � Flooring material � Combustion fuel
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REFERENCES:
¢ JICA 2OO6. The study on national waste minimisation in Malaysia. Retrieved from http://www.kpkt.gov.my/jpspn/fileupload/Laporan/GEJR06042_Summary.pdf
¢ Department of National Solid Waste Management, MHLG & Danish International Development Assistance (2010). Glass recycling in Kuantan: Exploring the potential for increasing recycling by collection of source sorted glass in Kuantan.
¢ John P., (2005), Waste Management Practices: Municipal, Hazardous and Industrial. Taylor & Francis group. USA