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生态学杂志 ›› 2009, Vol. 28 ›› Issue (08): 1584-1588.

• 研究报告 • 上一篇    下一篇

水热法改性粉煤灰去除矿山酸性废水中金属离子

王英刚;孙丽娜;张富韬   

  1. 沈阳大学污染环境的生态修复与资源化技术教育部重点实验室
  • 出版日期:2009-08-10 发布日期:2009-08-10

Metal ions removal from acid mine drainage by using hydrothermally modified fly ash.

WANG Ying gang;SUN Li na;ZHANG Fu tao   

  1. Key Laboratory of Eco-remediation of Contaminated Environment and Resources Reuse, Ministry of Education, Shenyang University
  • Online:2009-08-10 Published:2009-08-10

摘要: 矿山酸性废水污染是由开采矿山和废弃矿山的所产生的重要环境问题。本文利用廉价的粉煤灰通过水热法改性制备了沸石吸附剂,研究了不同pH值、接触时间和吸附剂加入量条件下,矿山废水中的重金属离子去除效果。结果表明:pH值是影响重金属离子去除的重要因素,pH值在为7时,其对Pb2+、Zn2+、Cu2+去除率分别为100%、95.2%和95.8%;吸附剂对Cu2+的去除主要是由吸附和沉淀共同作用完成的,而Zn2+和Pb2+的去除主要依靠吸附作用。随着吸附剂加入量的增加,Pb2+、Zn2+、Cu2+的吸附率也随之增加,其最优加入量分别为20、25和30 g·L -1 。当Pb2+、Zn2+、Cu2+的吸附时间分别为20、40和50 min时,其去除率可分别可达94.2%、95.2%和98.2%。此外,还讨论了复合离子相互间强化和抑制作用。当3种离子同时存在时,其相互间的强化作用并不明显,但会呈现较显著的抑制作用。

关键词: 草原, 沙漠化, 土壤碳、氮衰减

Abstract: Acid mine drainage (AMD) is an important environmental problem associated with both working and abandoned mining operations. By using low cost fly ash as raw material, a hydrothermally modified fly ash-zeolite sorbent was prepared, and the efficiency of this sorbent in removing metal ions from AMD was studied under conditions of different pH, sorbent dosage, and contact time. At pH 7, the removal rate of Pb2+, Zn2+, and Cu2+was 100%, 95.2%, and 95.8%, respectively. The Cu2+ removal was mainly under the actions of both adsorption and precipitation, while the removal of Zn2+ and Pb2+was mainly due to adsorption. The adsorption rate of Pb2+, Zn2+and Cu2+increased with increasing sorbent dosage, and the optimal dosage for the removal of Pb2+, Zn2+ and Cu2+was 20, 25, and 35 g·L -1  , respectively. When the contact time was 20, 40, and 45 min for Pb2+, Zn2+, and Cu2+, the removal rate of these metal ions was up to 94.2%, 95.2%, and 98.2% respectively. The co-existence of the three ions didn't promote but restrain their removal.

Key words: Grassland, Desertification, Soil C and N degradation