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Related Experiment Videos

Removal of batteries from solid waste using trommel separation.

S T Lau1, W H Cheung, C K Kwong

  • 1Department of Chemical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.

Waste Management (New York, N.Y.)
|June 28, 2005
PubMed
Summary

This study developed a trommel to separate batteries from solid waste. Optimal recovery was achieved with lower inclination angles, slower speeds, and higher organic content in the waste.

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Area of Science:

  • Environmental Engineering
  • Waste Management
  • Materials Science

Background:

  • Trommels are established cylindrical devices for size separation in waste processing.
  • Existing applications include municipal solid waste (MSW) processing, construction debris classification, incinerator ash screening, and compost processing.
  • Separating batteries from solid waste is crucial for alternative feedstock applications, especially in metal-sensitive processes like the Co-Co cement and power production.

Purpose of the Study:

  • To design and test a novel trommel specifically for the efficient separation of household batteries from solid waste.
  • To evaluate the impact of operational parameters (inclination angle, rotational speed) and waste composition on battery recovery efficiency.
  • To assess the potential of recovered batteries as feedstock for alternative waste combustion processes.

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Main Methods:

  • A trommel was designed based on size separation principles for household battery extraction.
  • Testing involved batches of university office and restaurant waste under varied trommel inclination angles and rotational speeds.
  • Physical characterization of a 20-kg solid waste sample was conducted to analyze composition.

Main Results:

  • Battery recovery efficiency was found to increase with decreasing trommel inclination angle and decreasing rotational speed.
  • Waste composition analysis revealed a trend of decreasing battery recovery with higher paper content.
  • Conversely, an increasing recovery of batteries was observed with a higher proportion of organic materials in the waste.

Conclusions:

  • The designed trommel is effective in separating batteries from solid waste, with performance influenced by operational settings.
  • Optimizing trommel angle and speed, alongside understanding waste composition, is key for maximizing battery recovery efficiency.
  • Recovered batteries can serve as valuable feedstock for specialized waste-to-energy applications, contributing to resource recovery and circular economy principles.