ü Hong-tao1,2;JIA Yong-feng1;YAN Hong3;CHEN Liang1 " /> Effects of pH, alkali type, and preequilibration duration on the long term stability of ironarsenic coprecipitate.
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Effects of pH, alkali type, and preequilibration duration on the long term stability of ironarsenic coprecipitate.

Lü Hong-tao1,2;JIA Yong-feng1;YAN Hong3;CHEN Liang1    

  1. 1Institute of Applied Ecology, Chinese Academy of Sciences, Shenyan
    g 110016, China;2Graduate University of Chinese Academy of Sciences, Beij
    ing 100039, China;3College of Resources & Civil Engineering, Northeaster
    n University, Shenyang 110004, China
  • Received:2008-02-20 Revised:1900-01-01 Online:2008-09-10 Published:2008-09-10

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Abstract: Coprecipitation of As(Ⅴ) with Fe(Ⅲ) is a widely used economical method for the removal of arsenic from mineral-processing solutions and effluents. To prevent secondary pollution, the stability of arsenic-bearing precipitates should be further studied. With simulation test, the stability of ironarsenic precipitate was investigated as a function of pH, alkali type, and preequilibration duration at pH 4. The results showed that at pH 4, the precipitate had the highest stability, and the stability was increased with the duration of preequilibration. The addition of lime or Ca2+ could markedly increase the stability of arsenic in the precipitate.

Key words: Cu and Pb pollution, Dichondra repens, Accumulation, Physiological index