33 / 46
Volume 2
Journal of Environmental Research
Page 80
JOINT EVENT
July 26-27, 2018 Rome, Italy
&
6
th
Edition of International Conference on
Water Pollution & Sewage Management
4
th
International Conference on
Pollution Control & Sustainable Environment
Destabilization potential of Fe
3+
and Al
3+
chloride salts and af-PFCl of Mg(OH)
2
during the treatment
of AMD
Ntwampe I O
and
Mootha K
University of Johannesburg, South Africa
T
he treated acid mine drainage (AMD) was collected from the western decant in Krugersdorp, South Africa and was
investigated in a series of small-scale laboratory tests using 200 mL of AMD dosed with FeCl
3
, AlCl
3
and a synthetic acid
free (af) flocculent prepared by a mixture of FeCl
3
and Mg(OH)
2
(af-PFCl
Mg
) respectively, the latter being to reduce the negative
effect of the reagents (FeCl
3
and Mg(OH)
2
) when dosed in pure form. Three treatment methods were employed such as a jar
test, no mixing and a shaker. The speed of the equipment used for mixing and shaking was at 250 rpm for 2 mins and allowed
to settle for 1 hour after which the pH, conductivity and turbidity were measured. The experimental results show that turbidity
removal in the samples with AlCl
3
and a synthetic af-PFCl
Mg
is similarly identical but slightly higher than that of the samples
with FeCl
3
. The results showed that conductivity has an impact on the rate of hydrolysis. Comparative turbidity removal of
the AMD sample between AlCl
3
, FeCl
3
and af-PFCl indicates that the latter is an ideal replacement of a corrosive FeCl
3
and
Alzheimer-associated AlCl
3
. On the other hand, the optimal turbidity removal of the samples without mixing shows that
destabilization-hydrolysis depends on the valence and electronegativity of the metal ions, which also indicates the insignificant
effect of the pH adjustment. The SEM images show that the sludge in the samples with af-PFClMg dosage consists of a large
cake-like structure, which is typical of optimal adsorption. The formation of the precipitates was found to be influenced by the
ionic strength of the metal ion rather than by the pH of the solution.
ontwampe@gmail.comJ Environ Res 2018, Volume: 2