Batch-scale remediation of toluene contaminated groundwater using PRB system with tyre crumb rubber and sand mixture

Rao, SM and Joshua, RE and Rekapalli, M (2020) Batch-scale remediation of toluene contaminated groundwater using PRB system with tyre crumb rubber and sand mixture. In: Journal of Water Process Engineering, 35 .

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Abstract

The objective of the study is to examine the potential of TCR (tyre crumb rubber) particles to remediate toluene contaminated aquifers by using them as the reactive constituent of permeable reactive barriers (PRB). The objective is achieved by performing laboratory experiments to identify toluene adsorption capacity and rate of toluene removal of the optimal TCR-sand mix. Adsorption isotherms and Kc-Co relations (Kc: distribution coefficient, Co: initial toluene concentration) identified the optimum mix (2.5 TCR-97.5 sand mix) for remediation of toluene contaminated water. Batch experiments showed that toluene adsorption by TCR particles is endothermic and is energetically favoured at higher temperature. Adsorption of the non-polar molecule by TCR particles obeyed bi-linear, pseudo first order kinetics. The carbon-black component of TCR particles adsorbed significant amount of toluene during the initial contact period (10�60 min). Scatchard analysis, Freundlich isotherm and DR (Dubinin-Radushkevich) equation indicated that toluene is adsorbed by van der Waals attraction at energetically heterogenous sites of TCR particles. The near irreversible toluene adsorption in the laboratory experiment is attributed to physical entrapment of the non-polar molecules in the medium and fine pores of TCR particles. Batch experiment results predict that unit PRB column constructed with 2.5 TCR-97.5 sand mix can remediate 11,013 K L of toluene contaminated (0.15 mg/L) groundwater near instantaneously. © 2020 Elsevier Ltd

Item Type:	Journal Article
Publication:	Journal of Water Process Engineering
Publisher:	Elsevier Ltd
Additional Information:	The copyright of this article belongs to Elsevier Ltd
Department/Centre:	Division of Mechanical Sciences > Centre for Sustainable Technologies (formerly ASTRA) Division of Mechanical Sciences > Civil Engineering
Date Deposited:	19 Aug 2020 11:16
Last Modified:	19 Aug 2020 11:16
URI:	http://eprints.iisc.ac.in/id/eprint/64751

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