Ex Situ Electroreclamation of Heavy Metals Contaminated Sludge: Pilot Scale Study
Publication: Journal of Environmental Engineering
Volume 125, Issue 10
Abstract
The ex situ remediation of heavy metals-contaminated industrial sludge (pH = 10.35, Zn = 3,500 mg/kg) by electroreclamation (I = 2.5 A) was studied at pilot scale (42.5 kg of sludge). This research focused on acidification of sludge and electrochemically induced migration of metals, emphasizing their partitioning prior to electroreclamation. The sludge was preacidified to an initial pH of 4.5. After treatment, a very low anode reservoir pH (near 0) was reached, and the average sludge pH was 2. Addition of 1 M HNO3 to the cathode reservoir prevented basic conditions in the sludge. In accordance with selective sequential extraction results, a low migration of Zn and Cu was obtained. In the anode region, Zn and Cu concentrations decreased by 33 and 39%, respectively, and increased in the cathode region by 33 and 26%, respectively. These metals were concentrated in the cathode area but were not effectively transported onto the cathode. Mn appeared to be more mobile than other metals. After 10 days of current application, a layer mainly composed of Ca, Fe, and Mn appeared on the cathode surface.
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References
1.
Acar, Y. B., and Alshawabkeh, A. N. (1993). “Principles of electrokinetic remediation.” Envir. Sci. and Technol., 27(13), 2638–2648.
2.
Acar, Y. B., et al. (1995). “Electrokinetic remediation: Basics and technology status.” J. Haz. Mat., 40, 117–137.
3.
Clarke, R. L., Kimmel, S., Lageman, R., and Smedley, S. (1996). “Electrokinetic remediation of soils, sludges and groundwater.” Proc., 58th Annual Meeting, American Power Conf., Illinois Institute of Technology, Chicago, 347–352.
4.
Federer, C. A., and Hornbeck, J. W. (1985). “The buffer capacity of forest soils in New England.” Water air soil pollution, Dordrecht, The Netherlands, 26, 163–173.
5.
Gale, R. J., Li, H., and Acar, Y. B. (1994). “Soil decontamination using electrokinetic processing.” Studies in Environmental Science, 59, 621–654.
6.
Gray, D. H. (1970). “Electrochemical hardening of clay soils.” Géotechnique, London, 20(1), 81–93.
7.
Hamed, J., Acar, Y. B., and Gale, R. J. (1991). “Pb(II) removal from kaolinite using electrokinetics.”J. Geotech. Engrg., ASCE 117(2), 241–271.
8.
Lageman, R. (1993). “Electroreclamation: Applications in The Netherlands.” Envir. Sci. and Technol., 27(13), 2648–2650.
9.
Lageman, R., Pool, W., and Seffinga, G. (1989). “Electro-Reclamation: Theory and practice.” Chem. and Industry, 9(September), 585–590.
10.
Lo, I. M. C., and Yang, X. Y. (1998). “Removal and redistribution of metals from contaminated soils by a sequential extraction method.” Waste Mgmt., Elsevier Science, New York, 18, 1–7.
11.
Lopez-Sanchez, J. F., Rubio, R., Samitier, C., and Rauret, G. (1996). “Trace metal partitioning in marine sediments and sludges deposited off the coast of Barcelona (Spain).” Water Res., 30(1), 153–159.
12.
Nirel, P. M. V., and Morel, F. M. M. (1990). “Pitfalls of sequential extractions.” Water Res., 24(8), 1055–1056.
13.
Phillips, I., and Chapple, L. (1995). “Assessment of a heavy metals contaminated site using sequential extraction, TCLP, and risk assessment techniques.” J. Soil Contamination, 4(4), 311–325.
14.
Probstein, R. F., and Hicks, R. E. (1993). “Removal of contaminants from soils by electric fields.” Sci., 260(April), 498–504.
15.
Recueil de normes françaises—Qualité des sols—Environnement. (1994). AFNOR, Paris (in French).
16.
Reddy, K. R., and Parapudi, U. S. (1997). “Removal of chromium, nickel and cadmium from clays by in-situ electrokinetic remediation.” J. Soil Contamination, 6(4), 391–407.
17.
Reed, B. E., Berg, M. T., Thompson, J. C., and Hatfield, J. H. (1995). “Chemical conditioning of electrode reservoirs during electrokinetic soil flushing of Pb-contaminated silt loam.”J. Envir. Engrg., ASCE, 121(11), 805–815.
18.
Simonsson, D. (1997). “Electrochemistry for a cleaner environment.” Chemical Society Reviews, 26, 181–189.
19.
Standard methods for the examination of water and wastewater. (1992). 18th Ed., American Public Health Association, Washington, D.C.
20.
Tessier, A., Campbell, P. G. C., and Bisson, M. (1979). “Sequential extraction procedure for the speciation of particulate trace metals.” Analytical Chemistry, 51(7), 844–851.
21.
Tessier, A., and Campbell, P. G. C. (1991). “Comment on `Pitfalls of sequential extractions.”' Water Res., 25(1), 115–117.
22.
Wasay, S. A., Barrington, S., and Tokunaga, S. (1998). “Retention form of heavy metals in three polluted soils.” J. Soil Contamination, 7(1), 103–119.
23.
Yarlagadda, P. S., Matsumoto, M. R., VanBenschoten, J. E., and Kathuria, A. (1995). “Characteristics of heavy metals in contaminated soils.”J. Envir. Engrg., ASCE, 121(4), 276–286.
24.
Yong, R. N., Mohamed, A. M. O., and Warkentin, B. P. (1992). Principles of contaminant transport in soils. Elsevier Science, Amsterdam.
25.
Yong, R. N., Galvez-Cloutier, R., and Phadungchewit, Y. (1993). “Selective sequential extraction analysis of heavy-metal retention in soil.” Can. Geotech. J., Ottawa, 30(5), 834–847.
26.
Zagury, G. J. ( 1997). “Etude d'un traitement par biolixiviation au moyen de la microflore lixiviante indigène ferrooxydante des sols contaminés aux métaux lourds (Zn, Cu, Mn).” PhD thesis, Sherbrooke University, Canada (in French).
27.
Zagury, G. J., Colombano, S. M., Narasiah, K. S., and Ballivy, G. (1997). “Neutralization of acid mine tailings by addition of alkaline sludge from pulp and paper industry.” Envir. Technol., London, 18(10), 959–973 (in French).
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 125 • Issue 10 • October 1999
Pages: 972 - 978
History
Received: Nov 30, 1998
Published online: Oct 1, 1999
Published in print: Oct 1999
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