A Study on Leaching Behavior of Na, Ca and K Using Column Leach Test

Authors: Barman P.J, Kartha S A, Gupta S, Pradhan B.

Abstract:

Column leach test has been performed to examine the behavior of leaching of sodium, calcium and potassium in landfills. In the column leach apparatus, two different layers of contaminated and uncontaminated soils of different height ratios (ratio of depth of contaminated soil to the depth of uncontaminated soil) are taken. Water is poured from an overhead tank at a particular flowrate to the inlet of the soil column for a certain ponding depth over the contaminated soil. Subsequent infiltration causes leaching and the leachates are collected from the bottom of the column. The concentrations of Na, Ca and K in the leachate are measured using flame photometry. The experiments are further extended by changing the rates of flow from the overhead tank to the inlet of the column in achieving the same ponding depth. The experiments are performed for different scenarios in which the height ratios are altered and the variations of concentrations of Na, Ca, and K are observed. The study brings an estimation of leaching in landfill sites for different heights and precipitation intensity where a ponding depth is maintained over the landfill. It has been observed that the leaching behavior of Na, Ca, and K are not similar. Calcium exhibits highest amount of leaching compared to Sodium and Potassium under similar experimental conditions.

Keywords: Column leaching, flow rate, uncontaminated soil, contaminated soil, concentration, height ratio.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1061056

References:

[1] Vismanthan C, Yin N H, Karthikeyan O.P.). "Co-disposal of electronic waste with municipal solid waste in bioreactor landfills", Waste Management vol.30, 2004 pp. 2608-2614.
[2] Munoz J F, Rengifo P and Vauclin M "Acid leaching of copper in a saturated porous material: Parameter identification and experimental validation of a two dimensional transport model "Journal of contaminant hydrology vol.28, pp. 1853-1867,1997.
[3] Morillo E, Martinez J.I.P and Gines J.M "Leaching of 2,4 D from a soil in presence of β-cyclodextrin: laboratory column experiments". Chemosphere 44, pp. 1065-1069, 2001.
[4] Meza S L, Kalbe U, Berger W,Simon F G "Effect of contact time on release of contaminants from granular waste materials during column leaching experiments". Waste Management 30,565-571, 2010.
[5] Yokozeki.K, Watanabe K, Sakata N and Otsuki N "Modeling of leaching from cementations materials used in underground environment "Applied Clay science vol.26, 293-308,2004.
[6] Cornejo L, Celis R, Dominguez C, Hermosin M.C. and Cornejo J. "Use of modified montmorillonites to reduce herbicide leaching in sports turf surfaces: Laboratory and field experiments" Applied Clay Science 42, 284-291, 2007.
[7] Hyks J and Astrup T "Influence of operational conditions, waste input and ageing on contaminant leaching from waste incinerator bottom ash: A full-scale study". Chemosphere 76, 1178-1184, 2009.
[8] Enell A, Reichenberg F, Warfvinge P and Ewald G. "A column method for determination of leaching of polycyclic aromatic hydrocarbons from aged contaminated soil". Chemosphere 54, pp707-715, 2003.
[9] Kaschl A, Romheld V, Chen Y "The influence of soluble organic matter from municipal solid waste compost on trace metal leaching in calcareous soils" The Science of the Total Environment vol.291 ,pp. 45-57.
[10] Dubey B, Townshend T, Gabriele H.S. "Metal loss from treated wood products in contact with municipal solid wasteland fills leachate". Journal of Contaminant Hydrology, Vol. 23, Issue 4, August 329- 345,2010.
[11] Sheikhzadeh G.A, Mehrabian M.A, Mansouri S.H and Sarraf A. "Computational modeling of unsaturated flow in liquid in heap leaching- using the results of column tests to calibrate the model". International Journal of Heat and Mass Transfer 48 , 279-292,2004.
[12] Karnchanawong S, Limpiteeprakan P "Evaluation of heavy metal leaching from spent household batteries disposed in municipal solid waste" Waste Management ,550-558,2009.
[13] Li Z, Shuman L M. "Mobility of Zn,Cd and Pb in soils as effected by poultry litter extract-I Leaching in soil columns" Environmental pollution Vol 95,No2 pp 219-226,1996.
[14] Basta N T, McGowan S L "Evaluation of chemical immobilization treatment for reducing heavy metal transport in a smelter contaminated soil "Environmental Pollution vol 127,pp. 73-82,2003.