Study the Effect of Reeds Tissues on the Adsorption of Heavy Metals and Bacteria from Sewage Water
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Date
2017-03-28
Authors
Salman, Munjeda Tahseen
Journal Title
Journal ISSN
Volume Title
Publisher
جامعة النجاح الوطنية
Abstract
The main problem here is to study the potential of Phragmites
australis and Phragmites used in the purification plant in Sarra village
(leaves, stems and roots) to absorb a specific heavy metal ions (Fe3 +, Cd2 +
,
Cu2 +, Ni2 + and Pb2 +) and their ability to stop bacterial activity in sewage
water.
Several experiments were conducted under different conditions and
variables such as temperature, pH, concentration of metal ions, plant
biomass and contact time to determine the optimal conditions for the best
adsorption of the metal ions specified in the research. It was observed that
the removal of these ions from the aqueous solutions was at a concentration
of 20mg / L and a temperature of 25oC and acidity around pH = 7 and
within 15-30 minutes.
The highest uptake rates under the optimum conditions for metal ions
were obtained using the biomass of both plants as follows: Iron 77%
absorbed by roots, Cadmium 72% absorbed Phragmites australis leaves,
88% copper absorbed by phragmites australis leaves and stalks, 93%
nickel absorbed by phragmites australis and lead absorbed with the
highest percentage which was 97% by the stalks of Phragmites australis,
XIV
so the absorption of lead element was studied under the influence of
different conditions of temperature, pH and contact time.
Experiments were done to examine the behavior of absorption under
competitive conditions in the presence of ions together in water. The results
showed that the order of percentages for the removal of metal ions was as
follows: Pb + 2> Cu + 2> Fe + 3> Ni + 2> Cd + 2
.
The results and analysis showed that the adsorption process can be
described according to the Langmuir model, indicating that the adsorption
process is monolayer. The negative ΔG values indicate that the adsorption
process is appropriate and spontaneous at the specified temperatures. The
negative value of ΔH° indicates that the adsorption process is exothermic
and is favored at low temperatures not more above room temperature, and
the value of ΔH° is much lower of those associated with chemical
adsorption, confirming the physical nature of the adsorption process. The
small positive value of ΔS° indicates structural changes on the biomass
surface, and that the disorder has increased near the adsorption surface
during the adsorption process.
The results confirm that the biomass of the plant is effective, suitable
and safe in removing heavy metal ions from sewage water. Phragmites
from Sarra (leaves, shoots and roots) had been tested for their antibacterial
activity and the result was negative.