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Mass flow assessment (MFA) and assessment of recycling strategies for cathode ray tubes (CRTs) for the Cape Metropolian Area (CMA), South Africa

TitleMass flow assessment (MFA) and assessment of recycling strategies for cathode ray tubes (CRTs) for the Cape Metropolian Area (CMA), South Africa
Publication TypeThesis
Year of Publication2006
AuthorsZumbühl D
UniversityETH Zurich / Empa
CityZurich / St.Gallen
Thesis TypeMaster Thesis

Cathode ray tubes (CRTs) are a major problem for further recycling in South Africa. At this stage, an economically feasible and environmentally sound recycling process is not available. CRTs are currently dumped or landfilled.The aim of this study is to provide background information for the future management of CRT screens in South Africa. Thus, a mass flow assessment (MFA) of cathode ray tube computer moni-tors and TVs for the Cape Metropolitan Area (CMA) based on the year 2005 was carried out. In addition, time series were calculated to forecast future figures of obsolete CRT devices. In a sec-ond step, local and best available recycling alternatives for the recycling of CRT glass were speci-fied and assessed towards their sustainability using the Multi Attribute Utility Theory (MAUT) meth-odology.The results of the MFA showed a significant consumer stock growth of both CRT monitors and TVs. Only little CRT devices are disposed of at landfill sites. The obsolescence will increase until 2020 for CRT computer monitors and for CRT TVs until 2020 to 2030. It is expected that in the year 2007 some 400 tons of CRT monitors and 600 tons of CRT TVs will become obsolete.The dismantling of CRT monitors and TVs is already established and economically feasible. Only the CRT cannot be recycled at this stage and is therefore landfilled. For the future recycling, local brick manufactures and the building industry is able to use the CRT glass in their processes. Nei-ther the assessed, local metal smelters nor glass manufacturers were prepared to use CRT glass in their processes. From the best available technologies, the use of CRT glass in the production of new CRTs and the use of CRT glass in the copper/lead smelting process were included in recy-cling scenarios. Together with the local option, eight scenarios were assessed using the MAUT methodology. A set of attributes was defined to evaluate the scenarios including economical, envi-ronmental and social attributes.The study shows that the manufacturing of new CRTs from recycled CRT glass is the best option in terms of sustainability. As second best option the lead recovery from CRT glass was identified.

Zumbuehl_2006_ETH-Empa.pdf2.14 MB
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