Paper sludge as a feasible soil amendment for the immobilization of Pb2+
Xiaojia He , Lei Yao , Zhu Liang , Jinren Ni
DOI:
Received May 01, 2009,Revised October 30, 2009, Accepted , Available online
Volume 22,2010,Pages 413-420
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The possibility of amending Pb2+ contaminated soil (S) with paper sludge (P) was investigated through adsorption and desorption
experiments. The adsorption process of Pb2+ in soil containing paper sludge (SP) could be well described by pseudo second-order
kinetic model and the Langmuir isotherm model. After P addition, the equilibrium time decreased greatly (from 28 to 8 hr) and the
Pb2+ maximum adsorbed amount (Qmax) increased by a factor of more than three to 102.04 mg/g. Qmax reached its maximum as S:P
was 9:1 (m/m) after 10 days contact between S and P. Moreover, Pb2+ adsorbed amount increased with the rise of pH during the
adsorption process. Desorption experiments indicated that Pb2+ adsorption in SP was irreversible. The metal ion fraction was analyzed
with Energy Dispersive Spectrometer and Environmental Scan Electron Microscope. As a result, the addition of P to soil was found to
induce a decrease in the mobile forms. The Pb2+ complexes formation in the presence of carbonates was the main adsorption mechanism.
Overall, the paper sludge could be one of the promising soil amendments for the remediation of soil with Pb2+ contamination.
