Heavy Metals Removal from Wastewater by Adsorption on Modified Physically Activated Sewage Sludge by M Nageeb Rashed in AOICS in Lupine Publishers
Low cost adsorbent (activated carbon) with a high metal adsorption
capacity was prepared from the disposal sewage sludge by physical
activation method (Pyrolysis temperatures at 500 °C, 650 °C, 700 °C, 800
°C and 900 °C). The resulting material was evaluated as adsorbents for
the removal of Cd, Pb, Cu, and Mn from aqueous solution. The results
revealed that sewage sludge activated by pyrolysis at 800 °C [ASS800]
was the most effective adsorbent for the removal of Cd, Pb, Cu and Mn
from polluted water. Batch studies were performed to evaluate the
influences of various experimental parameters such as pH, initial metal
ion concentration, adsorbent dosage, and contact time and solution
temperature. Adsorption of Cd, Pb, Cu and Mn by ASS800
increased with increasing pH and adsorbent dosage, while decreasing with
the increase of initial metal concentration. From batch adsorption data
the optimum conditions for the adsorption of Cd , Pb, Cu and Mn by ASS800 were 1gL-1 adsorbent dosage, 1 hour contact time, 10mgL-1
initial metal concentration, 25 °C solution temperature; and pH 6 .
Adsorption data were well fitted to the Langmuir, and Freundlich
isotherms. Thus, simple pyrolysis provide conversion of sewage sludge
into inexpensive low-rank adsorbent potentially useful for the removal
of heavy metals from polluted water.
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