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Title:
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Environmental efficiency of immobilization techniques for wastes inrelation to utilization and disposal
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Author(s):
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Published by:
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Publication date:
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ECN
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1996
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ECN report number:
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Document type:
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ECN-RX--96-045
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Other
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Number of pages:
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Full text:
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16
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Download PDF
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Abstract:
The development of new regulations for landfilling in Europe leads torequirements for treatment of waste prior to disposal. Various immobilization
techniques are applied or considered to meet new regulatory limits. In many
cases pass/fail tests developed for granular wastes are used to judge
solidified wastes for lack of better suited regulatory tests. New test
protocols for evaluating solidified waste are available now. A new approach
to assess treatment efficiency has been developed based on comparing the
leaching behaviour of a contaminated dredge spoil (example) in a compacted
granular leach test with leaching behaviour of monolithic products after
encapsulation of this waste in bitumen, cement-stabilization, sintering with
clay to form bricks and vitrification to a glassy product. The efficiency of
immobilization is separated in physical and chemical aspects, e.g. efficiency
relative to the potential leachability, physical restriction (tortuosity) and
release at a given time period. The data from untreated and treated material
are summarized in an environmental index to facilitate comparison of
treatment processes. 9 figs., 1 tab., 21 refs.
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