Efficient dehalogenation of automobile shredder residue in NaOH/ethylene glycol using a ball mill

Tomohito Kameda, Yuuzou Fukuda, Kye Sung Park, Guido Grause, Toshiaki Yoshioka

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

We investigated the effectiveness of sodium hydroxide/ethylene glycol (NaOH/EG) for dehalogenation of automobile shredder residue (ASR) using a ball mill. Efficient dehalogenation was achieved at atmospheric pressure by combining the use of EG (196 °C b.p.) as a replacement solvent for NaOH with ball milling, which improved contact between ASR and OH- in solution. Moderate NaOH concentrations and increased ball mill rotation speeds produced high dechlorination that was not significantly affected by the weight ratio of ASR to EG. NaOH/EG dechlorination increased with temperature with an apparent activation energy of 50 kJ mol-1 confirming that the reaction proceeded under chemical reaction control. The modified shrinking-core model was appropriate to explain the dechlorination process. Low chloro levels in our NaOH/EG-treated ASR suggested that this material could be used for feedstock recycling and the wet process may be applicable for dehalogenation of other important waste streams.

Original languageEnglish
Pages (from-to)287-292
Number of pages6
JournalChemosphere
Volume74
Issue number2
DOIs
Publication statusPublished - 2009 Jan

Keywords

  • Automobile shredder residue
  • Ball milling
  • Dehalogenation
  • Modified shrinking-core model
  • NaOH/EG solution

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

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