Mr. Patrick Sharrock Université de Toulouse, Mines ALBI FRANCE.

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Presentation transcript:

Mr. Patrick Sharrock Université de Toulouse, Mines ALBI FRANCE

Nacira Belaicha 1, Wahiba Lemlikchi 1, Med Oimar Mecherri 1, Patrick Sharrock 2, Ange Nzihou 2

Real permeable barrier construction….

Reactive barrier contents: ZVI Zeolites, clays, Organic matter Calcium phosphates?

Chanvre Hemp

hydroxyapatite, Ca 5 (PO 4 ) 3 OH, fluoroapatite, Ca 5 (PO 4 ) 3 F photo by Alain Darbellay, GGGems.com.GGGems.com Stable products of calcium and phosphorous Phosphate ores comprise animal bone residues

Reaction mechanism HYDROXYAPATITE (Ca 5 )(PO 4 ) 3 OH CONTAMINANTS Zn 2+ (Ca,Zn) 5 (PO 4 ) 3 OH Thermodynamically favorable reactions. (Ca,Pb) 5 (PO 4 ) 3 OH Pb 5 (PO 4 ) 3 Br Zn 5 (PO 4 ) 3 F Cu 5 (PO 4 ) 3 OH Cd 5 (PO 4 ) 3 OH Ca 5 (AsO 4 ) 3 OH (UO 2 ) 3 (PO 4 ) 28H 2 O

Mineral surface layers Water Adsorption Co-precipitation Surface precipitation Mechanisms of Metal Interaction at the Mineral-Water Interface xZn2+ + Ca10(PO4)6(OH)2  (10-x)Ca2+ + Ca10-xZnx(PO4)6(OH)2

Composites tested: Plaster + hydroxyapatite (HA or duck bone) Plaster + hydroxyapatite + fibers

use two parts plaster to one part water

Natural porosity of plaster…

Experimental set-up for testing porous plaster filter

1% fibers 2% fibers

Mechanical strength of synthetic Ha

Mechanical strength of duck bone calcinated Ha

Tensile strength decreases when bone HA increases

Tensile strength decreases as porous bone HA increases

Plaster-HA composite retains zinc ions

Composite with more HA retains more zinc

Amount of zinc removed decreases with increase in flow rate

Composite material can retain heavy metals and avoid dispersion of fine metal phosphates