Article: pH and redox buffering systems of landfill leachate contaminated aquifer materials Journal: International Journal of Environmental Technology and Management (IJETM) 2013 Vol.16 No.4 pp.355 - 369 Abstract: Introduction of landfill leachate into an aerobic aquifer leads to a variety of redox and pH buffering reactions between dissolved chemical species and aquifer sediments, which play profound effects on the behaviours of contaminants beneath and down gradient from the landfill. The specific objective of this study was to determine the spatial and temporal variations of pH and redox buffering capacity of aquifer sediments. Experimental results indicated that the Total pH Buffering Capacity (TpHBC) of uncontaminated aquifer material was 212.5 mmol/kgpH<SUP align="right"><SMALL>−1</SMALL></SUP>. Fe(III) was the predominant constituent of Oxidation Capacity (OXC). TOC accounted for 98.7% of reduction capacity (RDC) in uncontaminated aquifer material. With the progressive development of the aquifer pollution, RDC was increasing while OXC was decreasing. Fe(III) oxides were reduced to Fe(II) which lead to the increase of RDC in anaerobic aquifer. Fe(II) distribution was controlled by the pH and redox environment of the subsurface. Inderscience Publishers - linking academia, business and industry through research

Title: pH and redox buffering systems of landfill leachate contaminated aquifer materials

Authors: Dong Jun; Wang Min; Bai Xuemei; Zhou Rui

Addresses: College of Environment and Resources, Jilin University, Changchun, Jilin 130026, China ' College of Environment and Resources, Jilin University, Changchun, Jilin 130026, China ' College of Environment and Resources, Jilin University, Changchun, Jilin 130026, China ' College of Environment and Resources, Jilin University, Changchun, Jilin 130026, China

Abstract: Introduction of landfill leachate into an aerobic aquifer leads to a variety of redox and pH buffering reactions between dissolved chemical species and aquifer sediments, which play profound effects on the behaviours of contaminants beneath and down gradient from the landfill. The specific objective of this study was to determine the spatial and temporal variations of pH and redox buffering capacity of aquifer sediments. Experimental results indicated that the Total pH Buffering Capacity (TpHBC) of uncontaminated aquifer material was 212.5 mmol/kgpH⁻¹. Fe(III) was the predominant constituent of Oxidation Capacity (OXC). TOC accounted for 98.7% of reduction capacity (RDC) in uncontaminated aquifer material. With the progressive development of the aquifer pollution, RDC was increasing while OXC was decreasing. Fe(III) oxides were reduced to Fe(II) which lead to the increase of RDC in anaerobic aquifer. Fe(II) distribution was controlled by the pH and redox environment of the subsurface.

Keywords: acid buffer capacity; landfill leachate; aquifer sediments; buffer systems; dissolved chemical species; pH buffering; redox buffering; oxidation capacity; aquifer pollution; water pollution; environmental pollution; iron.

DOI: 10.1504/IJETM.2013.054905

International Journal of Environmental Technology and Management, 2013 Vol.16 No.4, pp.355 - 369

Received: 17 Jan 2012
Accepted: 02 Oct 2012
Published online: 17 Sep 2014 *

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Title: pH and redox buffering systems of landfill leachate contaminated aquifer materials

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