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Effect of Alkali Treatment on Heavy Metals Adsorption Capacity of Sewage Sludge

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DOI: 10.4236/gep.2015.32006    2,515 Downloads   2,969 Views   Citations

ABSTRACT

Sewage sludge is the promising raw material for biosorbent preparation. In this work, we evaluated the heavy metals adsorption characteristics of alkali treated sewage sludge (ATSS) by equilibrium studies. The adsorption isotherms were fitted with Langmuir and Freundlich models. Comparing with untreated sewage sludge, the total adsorption capacity (qm) of ATSS (prepared with 0.125 mol/L NaOH) for Cd, Pb, Ni, increased by 0.51, 0.70 and 0.32 mmol/g, respectively. When the NaOH concentration for ATSS preparation increased from 0.125 mol/L to 0.25 mol/L, the qm of ATSS for Pb decreased from 1.05 mmol/g to 0.84 mmol/g. However, when the NaOH concentration increased from 0.25 mol/L to 7.5 mol/L, it showed increasing trend. According to the IR spectra data, the adsorption effect of biosorbent for heavy metals was mainly due to the complexation of -N-H groups and -COOH groups.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Hu, J. , Yang, X. , Shao, L. , He, X. and Men, K. (2015) Effect of Alkali Treatment on Heavy Metals Adsorption Capacity of Sewage Sludge. Journal of Geoscience and Environment Protection, 3, 33-39. doi: 10.4236/gep.2015.32006.

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