Comparison of trace element emissions from thermal treatments of heavy metal hyperaccumulators

Shengyong Lu, Yingzhe Du, Daoxu Zhong, Bing Zhao, Xiaodong Li, Mengxia Xu, Zhu Li, Yongming Luo, Jianhua Yan, Longhua Wu

Research output: Journal PublicationArticlepeer-review

56 Citations (Scopus)

Abstract

Phytoextraction has become one of the most promising remediation techniques for heavy metal (HM) contaminated soils. However, the technique invariably produces large amounts of HM-enriched hyperaccumulators, which need further safe disposal. In this study, two different thermal treatment methods are investigated as potential options for evaporative separation of HMs from the residues. A horizontal tube furnace and a vertical entrained flow tube furnace were used for testing the disposal of grounded hyperaccumulators. The release characteristics of HMs (Cd, Cu, Pb, and Zn) into flue gas and residues were investigated for thermal treatment of the Cd and Zn hyperaccumulators Sedum plumbizincicola and Sedum alfredii. In a horizontal tube furnace, incineration favors the volatilization of Cu and Cd in contrast to pyrolysis. The percentages of HMs in residues after incineration are lower than those after pyrolysis, especially for Cd, Pb, and Zn. However, in an entrained flow tube furnace, Zn content in flue gas increases with increasing temperature, but Cu and Cd contents are fluctuated. In addition, a higher incineration temperature enhances the Cu content in residues.

Original languageEnglish
Pages (from-to)5025-5031
Number of pages7
JournalEnvironmental Science & Technology
Volume46
Issue number9
DOIs
Publication statusPublished - 1 May 2012
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry (all)
  • Environmental Chemistry

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