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cje ›› 2009, Vol. 28 ›› Issue (08): 1584-1588.

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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

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