EFFECT OF HEAVY METAL CONTAMINANTS ON THE PERFORMANCE OF SAND ENHANCED BENTONITE (SEB) IN ENGINEERING WASTE DISPOSAL SITES

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OUHADI V.R.; HAGHAYEGH A.; BAYESTEH H.

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Journal: MODARES TECHNICAL AND ENGINEERING Year:2008 | Volume:- | Issue:33 (SPECIAL ISSUE ON CIVIL ENGINEERING) Page(s): 71-82

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Title

EFFECT OF HEAVY METAL CONTAMINANTS ON THE PERFORMANCE OF SAND ENHANCED BENTONITE (SEB) IN ENGINEERING WASTE DISPOSAL SITES

Author(s)

OUHADI V.R. | HAGHAYEGH A. | BAYESTEH H. | Issue Writer Certificate

Keywords

ENGINEERING WASTE DISPOSALQ3

HEAVY METAL IONSQ3

SAND ENHANCED BENTONITEQ3

PLASTICITY PROPERTIESQ3

HYDRAULIC CONDUCTIVITYQ3

Abstract

The transport of leachates and contaminants to the sub-layers of waste disposal sites and further contamination of underground water is a common problem in geo-environmental engineering. The use of SAND ENHANCED BENTONITE (SEB) mixtures, as a layer to prevent contaminant transport, is very common in these projects. These mixtures have very high adsorption characteristics and very low HYDRAULIC CONDUCTIVITY. Previous researches indicate that the variation of HYDRAULIC CONDUCTIVITY of soils is a function of PLASTICITY PROPERTIES of soil. In the current research the impact of two heavy metalions (HMs), Pb and Zn, which can be found in many industrials waste disposal sites, on plasticity behaviour of soils are investigated. Samples of mixtures of sand-bentonite, at different sand-bentonite ratios, were exposed to different concentration of HEAVY METAL IONS. After equilibrium condition, the atterberg limits of those samples were determined. In addition, the effect of Pb and Zn ions on the pH of samples is monitored. Furthermore, the impact of HEAVY METAL IONS on the soil structure is assessed by the use of SEM micrographs. Results show that the presence of HEAVY METAL IONS causes a reduction on the plasticity behaviour and pH of the samples. These reductions are attributed to the adsorption of HMs to the bentonite, the flocculated structure due to the low pH, and decrease of the thickness of the double layer. For restriction of these impacts it is suggested that only 20% bentonite is used in SEE.

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APA: Copy

OUHADI, V.R., HAGHAYEGH, A., & BAYESTEH, H.. (2008). EFFECT OF HEAVY METAL CONTAMINANTS ON THE PERFORMANCE OF SAND ENHANCED BENTONITE (SEB) IN ENGINEERING WASTE DISPOSAL SITES. MODARES TECHNICAL AND ENGINEERING, -(33 (SPECIAL ISSUE ON CIVIL ENGINEERING)), 71-82. SID. https://sid.ir/paper/25018/en

Vancouver: Copy

OUHADI V.R., HAGHAYEGH A., BAYESTEH H.. EFFECT OF HEAVY METAL CONTAMINANTS ON THE PERFORMANCE OF SAND ENHANCED BENTONITE (SEB) IN ENGINEERING WASTE DISPOSAL SITES. MODARES TECHNICAL AND ENGINEERING[Internet]. 2008;-(33 (SPECIAL ISSUE ON CIVIL ENGINEERING)):71-82. Available from: https://sid.ir/paper/25018/en

IEEE: Copy

V.R. OUHADI, A. HAGHAYEGH, and H. BAYESTEH, “EFFECT OF HEAVY METAL CONTAMINANTS ON THE PERFORMANCE OF SAND ENHANCED BENTONITE (SEB) IN ENGINEERING WASTE DISPOSAL SITES,” MODARES TECHNICAL AND ENGINEERING, vol. -, no. 33 (SPECIAL ISSUE ON CIVIL ENGINEERING), pp. 71–82, 2008, [Online]. Available: https://sid.ir/paper/25018/en

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