Mercury removal using ground and calcined mussel shell

We determined mercury retention on calcined and ground mussel shell, in presence and absence of phosphate, using batch and stirred flow chamber experiments. In batch experiments the calcined shell exhibited higher Hg adsorption, with good fitting to Freundlich equation （R^2： 0.925-0.978）; the presen...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2013-12, Vol.25 (12), p.2476-2486
Main Author: Susana Pena-Rodriguez Alipio Bermfidez-Couso Juan Carlos Novoa-Munoz Manuel Arias-Estevez Maria J. Fenandez-Sanjurjo Esperanza Alvarez-Rodrfguez Avelino Nunez-Delgado
Format: Article
Language:English
Subjects:
Adsorption
Animal Shells - chemistry
Animals
calcite
Desorption
dolomite
Environmental Pollutants - isolation & purification
Flow chambers
Freundlich方程
Grounds
heavy metals pollution
Marine
mercury
Mercury (metal)
Mercury - isolation & purification
mollusc shell
Mussels
Mytilus - chemistry
Phosphates
Phosphates - chemistry
recycling
Roasting
shell (molluscs)
Shells
sorption isotherms
地面
批实验
煅烧
相互作用
磷酸盐溶液
贝壳
除汞
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Summary:We determined mercury retention on calcined and ground mussel shell, in presence and absence of phosphate, using batch and stirred flow chamber experiments. In batch experiments the calcined shell exhibited higher Hg adsorption, with good fitting to Freundlich equation （R^2： 0.925-0.978）; the presence of phosphate increased Hg adsorption; mercury desorption was 13% or lower, diminishing up to 2% under the presence of phosphates. In stirred flow chamber experiments calcined shell retained more Hg than ground shells （6300 vs. 4000-5200 μmol/kg）; Hg retention increased an additional 40% on calcined shell and up to an additional 70% on ground shells when phosphates were present; mercury desorption was quite similar in all shell types （20%-34%）, increasing up to 49%-60% in ground shells when phosphates were present. The higher Hg adsorption on calcined shell would be related to its calcite and dolomite concentrations; mercury-phosphate interactions would cause the increase in Hg retention when phosphates are present. Data on Hg desorption suggest that Hg retention was not easily reversible after batch experiments, increasing in the stirred flow chamber due to convective flow. Calcined and ground mussel shells could be recycled removing Hg from water, with the presence of phosphates in solution improving efficacy.
ISSN:1001-0742
1878-7320
DOI:10.1016/S1001-0742(12)60320-9