Removal of dissolved organic carbon by aquifer material: Correlations between column parameters, sorption isotherms and octanol-water partition coefficient. (15th July 2016)

• Record Type: Journal Article
• Authors: Pradhan, Snigdhendubala; Boernick, Hilmar; Kumar, Pradeep; Mehrotra, Indu
• Is Part Of: Journal of environmental management. Volume 177(2016)
• Page Start: 36
• Page End: 44
• Publication Date: 2016-07-15
• Subjects: Sorption -- Sorption isotherm -- Mass transfer model -- Soil-water partition coefficient -- Octanol-water partition coefficient -- Retardation factor; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2016.03.047
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: The correlation between octanol-water partition coefficient (KOW ) and the transport of aqueous samples containing single organic compound is well documented. The concept of the KOW of river water containing the mixture of organics was evolved by Pradhan et al. (2015). The present study aims at determining the KOW and sorption parameters of synthetic aqueous samples and river water to finding out the correlation, if any. The laboratory scale columns packed with aquifer materials were fed with synthetic and river water samples. Under the operating conditions, the compounds in the samples did not separate, and all the samples that contain more than one organic compound yielded a single breakthrough curve. Breakthrough curves simulated from sorption isotherms were compared with those from the column runs. The sorption parameters such as retardation factor (Rf ), height of mass transfer zone (HMTZ ), rate of mass transfer zone (RMTZ ), breakpoint column capacity (qb ) and maximum column capacity (qx ) estimated from column runs, sorption isotherms and models developed by Yoon-Nelson, Bohart-Adam and Thomas were in agreement. The empirical correlations were found between the KOW and sorption parameters. The transport of the organics measured as dissolved organic carbon (DOC) through the aquifer can be predicted from the KOW of the river water and other water samples. The novelty of the study is to measure KOW and to envisage the fate of the DOC of the river water, particularly during riverbank filtration. Statistical analysis of the results revealed a fair agreement between the observed and computed values. Highlights: This study identifies the main aspects that influence fate of DOC during natural filtration process. Sorption parameters of aqueous DOC on aquifer material were identified from the KOW . Empirical correlations were found among sorption parameters and KOW . Further, this study was in good agreement when compared with sorption isotherms, Yoon-Nelson, Bohart-Adam and Thomas model.