Abstract
Performances of combined adsorption and chemical precipitation were evaluated as one of the options for pretreatment or post-treatment of a municipal solid waste (MSW) landfill leachate and leachate from an industrial solid waste landfill. The COD and color removals of the leachate from a MSW landfill were 35% and 33% at an alum dose of 300 mg/L with preceding PAC (powdered activated carbon) dose of 200 mg/L, respectively. For MSW leachate, the combined adsorption and coagulation process showed 2.3 times higher COD removal at PAC dose of 200 mg/L and alum dose of 500 mg/L than the unit process of adsorption with poor settleability. The COD removal was accomplished mainly by adsorption, while coagulation was a key mechanism of color removal. The COD and color of the biologically treated leachate from an industrial solid waste landfill were removed up to 32% and 68%, respectively, at addition of 490 mgAlum/L and 1,000 mgPAC/L in adsorption-coagulation process with pH control. Combined adsorption and coagulation process with pH control showed better COD and color removal than the process without pH control. The color removal was influenced greatly by pH control, while COD removal was not. No difference in removal efficiency was observed between adsorption-coagulation and coagulation-adsorption. Maximum net increases in the COD and color removals by the adsorption-coagulation process were 40% and 46%, respectively, compared with the removals by sole chemical precipitation. The Freundlich isotherm exclusively described the adsorption of leachate components on the PAC. Thus, a combined adsorption and coagulation process was considered to be effective for pre-treatment or post-treatment of landfill leachate, and has distinct features of simple, flexible, stable and reliable operation against fluctuation of leachate quality and flowrate.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
American Public Health Association, American Water Works Association and Water Environment Federation, “Standard Methods for the Examination of Water and Wastewater,” Greenberg, A. E., Cleseri, L. S. and Eaton, A. D. (eds), 19th ed., APHA (1995).
Cossu, R., Serra, R. and Muntoni, A., “Physico-Chemical Treatment of Leachate In: Landfilling of Waste: Leachate,” Christensen, T. H., Cossu, R. and Stegmann, R. (eds), Elsevier Applied Science, 265 (1992).
Ehrig, H. J., “Physicochemical Treatment, In: Sanitary Landfilling: Process Technology and Environmental Impact,” Christensen, T. H., Cossu, R. and Stegmann, R. (eds), Academic Press, 285 (1989).
Gau, S. H. and Chang, F. S., “Improved Fenton Method to Remove Recalcitrant Organics in Landfill Leachate,”Water Sci. and Technol.,34(7-8), 455 (1996).
Kapetanios, E., Papadopoulous, A., Loizidou, M. and Haralambous, K. J., “Physical-Chemical-Biological Treatment of Leachates from Stabilized Landfills,” Proc. Fifth International Landfill Symposium, Sardinia, Italy,1, 551 (1995).
Kim, K. R., Lee, S. H., Paek, S.W., Chung, H. S. and Yoo, J. H., “Adsorption of Cobalt Ion by Titanium-based Oxides in High Temperature Water,”Korean J. Chem. Eng.,16, 34 (1999).
Najm, I. N., Sneyink, V. L. and Lykins Jr., B.W., “Using Powdered Activated Carbon: Critical Review,”J. Amer. Water Works Asso.,83(1), 65 (1991).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Hur, J.M., Kim, S.H. Combined adsorption and Chemical precipitation process for pretreatment or post-treatment of landfill leachate. Korean J. Chem. Eng. 17, 433–437 (2000). https://doi.org/10.1007/BF02706856
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02706856