ü Hong-tao1,2;JIA Yong-feng1;YAN Hong3;CHEN Liang1 " /> pH值、碱类型及预停留时间对铁砷共沉淀物长期稳定性的影响
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pH值、碱类型及预停留时间对铁砷共沉淀物长期稳定性的影响

吕洪涛1,2;贾永锋1;闫洪3;陈亮1   

  1. 1中国科学院沈阳应用生态研究所, 沈阳 110016;2中国科学院研究生院, 北京 100039;3东北大学资源与土木工程学院, 沈阳 110004
  • 收稿日期:2008-02-20 修回日期:1900-01-01 出版日期:2008-09-10 发布日期:2008-09-10

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

摘要: Fe(Ⅲ)As(Ⅴ)共沉淀法作为一种经济的除砷方法,被广泛应用于处理有色冶金含砷废水。为防止处理后的含砷废渣二次污染,必须进一步研究其稳定性。本文通过室内模拟实验,研究了不同pH值、碱类型及在pH 4条件下的预停留时间等对铁砷共沉淀物稳定性的影响。结果表明,在pH 4条件下,共沉淀物稳定性最好;在pH 4条件下延长预停留时间能增强砷的稳定程度;使用石灰或添加Ca2+明显增加了共沉淀物中砷的稳定性。

关键词: Cu、Pb污染, 马蹄金, 富集, 生理指标

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