Extraction of heavy metals from MSW incinerator fly ashes by chelating agents

被引:119
作者
Hong, KJ
Tokunaga, S
Kajiuchi, T
机构
[1] Natl Inst Mat & Chem Res, Dept Chem Syst, Tsukuba, Ibaraki 3058565, Japan
[2] Tokyo Inst Technol, Dept Chem Engn, Meguro Ku, Tokyo 1528550, Japan
关键词
chelating agent; acid treatment; detoxification; extraction; fly ash; heavy metals;
D O I
10.1016/S0304-3894(00)00171-0
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
An extraction process has been studied on a laboratory scale for the pretreatment of municipal solid waste (MSW) incinerator fly ash to remobilize Cr, Cu, Ph, and Zn. Five different types of fly ashes were treated with HCl, nitrilotriacetic acid (NTA), ethylendiaminetetraacetate (EDTA), or diethylenetriaminepentaacetate (DTPA) in a batch process in the pH range 2.5-10. The extraction of heavy metals by HCl was dependent on pH, increasing with increasing acid concentration. The efficiency of the chelating agents was independent of pH. By the treatment with 3.0% EDTA or DTPA, 20-50% of Cr, 60-95% of Cu, 60-100% of Ph, and 50-100% of Zn were extracted in the pH range 3-9. NTA was also effective in extracting Cr, Cu, and Zn. The maximum extraction of Cr, Cu, Ph, and Zn was obtained at 0.3-1.0% concentration of the chelating agents. NTA was effective in extracting Pb at a concentration as low as 0.1%. Extraction behavior of other elements during the treatment was also studied. The leaching test on the residues after the treatment with chelating agents showed that the fly ashes were successfully detoxified to meet the guideline for landfilling. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:57 / 73
页数:17
相关论文
共 20 条
  • [1] [Anonymous], 1995, STANDARD METHODS EXA
  • [2] Conner JR., 1990, CHEM FIXATION SOLIDI
  • [3] DELABARRE C, 1997, VERRE VERSAILLES, V3, P33
  • [4] ELLIOTT HA, 1989, WATER AIR SOIL POLL, V45, P361
  • [5] *ENV AG, 1973, 13 ENV AG
  • [6] GRAYDON JW, 1992, EPD C 1992 TMS, P327
  • [7] COMPOSITION AND SIZE DISTRIBUTIONS OF PARTICLES RELEASED IN REFUSE INCINERATION
    GREENBERG, RR
    ZOLLER, WH
    GORDON, GE
    [J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1978, 12 (05) : 566 - 573
  • [8] Full-scale plant study on fly ash treatment by the acid extraction process
    Katsuura, H
    Inoue, T
    Hiraoka, M
    Sakai, S
    [J]. WASTE MANAGEMENT, 1996, 16 (5-6) : 491 - 499
  • [9] Chemical speciation and leaching properties of elements in municipal incinerator ashes
    Kida, A
    Noma, Y
    Imada, T
    [J]. WASTE MANAGEMENT, 1996, 16 (5-6) : 527 - 536
  • [10] Martell A.E., 1976, CRITICAL STABILITY C, V1