Permeable reactive barriers made with ZVI-doped porous plaster

for the treatementof organic nitro compounds

on laboratory scale

Saliha Boudia, Marina Fiallo, Patrick Sharrock

Tizi-Ouzou

Castres

Université Mouloud Mammeri Université Toulouse 3 Paul Sabatier

Source: http://grida3.crs4.it/grida3/doku.php?id=activity:prb-zvi

Permeable Reactive Barrier

USE OF PRB

Remediation of groundwater

ImmobilizationTransformation (chemical reduction)

Evaluating possibilities for flow bypassdue to reduced porosity

Pump and TreatMethods

Scrap ironand wood

Trench excavation

Zero Iron Valent

Anaerobic corrosionFe0 + 2H2O Fe2+ + H2 + 2OH-

Aerobic corrosion2Fe0 +O2 + 2H2O 2Fe2+ + 4OH-

Interstate Technology and Regulatory Council USA

Bechamp reduction (1854)

60-100°C

p-nitroaniline phenylenediamine

(plaster of paris, gypsum)

CaSO4 x 0.5 H2O CaSO4 x 2H20

Why plaster

wood ash

sheep wool

straw of hemp

PLASTER cylinder (50 g)

POROUS PLASTER = CaCO3 + H3O+

Plaster/water 50/35 (w:w)

POROUS PLASTER + ZVI

+ ZVI

+ charcoal

plaster

Treatement of an aqueous solution of p-nitroanilina

column

Recovery of phenylenediamine

flow

0.24 ml/min

0.40 ml/min

0.15 ml/min

Carcassonne

Salsigne