Leaching Column Tests on Arsenic-Soil Interactions

Tan, B. K.; Yong, Raymond N.; Thomas, Hywel Rhys

doi:10.1061/40860(192)35

Cited by 9 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, the main author and his co-workers have been studying laboratory and field scale analysis of naturally occurring inorganic contaminants such as As(V) and As(III) in the context of groundwater contamination in Bangladesh (Khan et al 2003;Shaw and Thomas 2004;Tan et al 2006). In this study, the effect of bacterial activity on the release of arsenic was examined from an experimental point of view.…”

Section: Resultsmentioning

confidence: 98%

On the Inclusion of Some Biological Impacts and Influences in Coupled Transport Phenomena in Unsaturated Soil

Thomas

Seetharam

2010

Geotech Geol Eng

View full text Add to dashboard Cite

This paper presents a first attempt at the inclusion of some biological impacts and influences in the authors' continued research on coupled transport phenomena through unsaturated porous media. The work presented here forms an extension to an existing coupled Thermo-Hydraulic-ChemicalMechanical Model (THCM) to include the biological aspects, as a first attempt towards a new THCMB framework. The biological model incorporates biodegradation kinetics of organic substrates and resultant effects in the inorganic geochemistry. In order to achieve this, the biological aspects of the model are coupled to an equilibrium geochemical model following a two-step partial equilibrium approach. Additionally, of concern in contaminant/pollutant transport studies, including the biological aspects, is the effect on human health. This paper therefore also presents some aspects of a health impact analysis model adopted in this study.

show abstract

Section: Resultsmentioning

confidence: 98%

On the Inclusion of Some Biological Impacts and Influences in Coupled Transport Phenomena in Unsaturated Soil

Thomas

Seetharam

2010

Geotech Geol Eng

View full text Add to dashboard Cite

show abstract

“…Engineering geology is seen to make two valuable contributions to this field. First, through laboratory-and field-scale studies it provides an insight into the geological factors that affect contaminant fate and transport in the subsurface, such as the presence of preferential flow paths ), sorbing materials Pietzsch et al 2009;Tan 2009) and technogenic processes (Petrova et al 2009). Second, it draws upon the principles of hydrogeology to develop analytical and numerical models that may be useful to estimate the fate and transport of contaminants through the subsurface and, thus, whether or not contaminants are likely to reach receptors at sufficient concentrations to cause unacceptable risks.…”

Section: Fate and Transportmentioning

confidence: 99%

“…It was demonstrated that the material generated using this technique could be used as fertile topsoil in quarry reclamation, thus minimizing waste sent off-site to D. I. SCOTT & A. W. HATHEWAY landfill. Furthermore, engineering geologists have contributed to the understanding of how geological materials can be added to soils and sediments to enhance the sorption of contaminants during their migration through the subsurface, thus increasing the time taken for the contaminants to reach receptors Tan 2009). For example, Alamino et al (2009) examined the migrationreduction effect of adding swelling bentonitic clay minerals and organic matter to cadmium-contaminated soils, whereas Tan (2009) examined the reduction in arsenic migration resulting from the addition of organic matter to arseniccontaminated soils.…”

Section: Remediationmentioning

confidence: 99%

The management of derelict, polluted and contaminated land

Scott

Hatheway²

2009

EGSP

View full text Add to dashboard Cite

Twenty-six papers submitted to the theme of 'Dereliction, Pollution and Contaminated Land' at the 10th IAEG Congress were reviewed as the basis for this topical summary. Despite the theme subject of abandoned or derelict land, most of the papers addressed chemical damage associated with historically contaminated land. Important contributions to this multidisciplinary field are being made by engineering geologists mainly in three domains: (1) provision of a 'geotechnical' characterization of contaminated geological media; (2) characterization of the fate and transport of contaminants through complex geological pathways; (3) the development of in situ and ex situ treatment-based remediation options that provide sustainable alternatives to 'dig-and-dump'. Several papers also indicated that engineering geology has an important role to play in the prevention of future pollution at the source, as opposed to traditional 'end-of-pipe' methods of pollution control.

show abstract

“…A method that evaluates the long-term leachability potential of arsenic is the use of continuous column tests within a simulated landfill environment in terms of pH, redox potential, and biological activity. Although column leach testing provides a realistic simulation tool to examine the interactions between ABSR and particular surroundings, the long testing time, months to years, limits its application for routine risk assessment of contaminated solid waste (Tan et al, 2006, Ghosh et al, 2006). Compared with column tests, a relatively simple and more widely used method is sequential extraction, which can provide information on proportion of a contaminant in different phases and consequently on its leachability and bioavailability (Tessier et al, 1979, Shiowatana et al, 1006).…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Mobility of Arsenic in Synthetic Iron-Containing Solids Using a Modified Sequential Extraction Method

2010

View full text Add to dashboard Cite

Many water treatment technologies for arsenic removal that are used today produce arsenic-bearing residuals which are disposed in non-hazardous landfills. Previous works have established that many of these residuals will release arsenic to a much greater extent than predicted by standard regulatory leaching tests (e.g. the toxicity characteristic leaching procedure, TCLP) and, consequently, require stabilization to ensure benign behavior after disposal. In this work, a four-step sequential extraction method was developed in an effort to determine the proportion of arsenic in various phases in untreated as well as stabilized iron-based solid matrices. The solids synthesized using various potential stabilization techniques included: amorphous arsenic-iron sludge (ASL), reduced ASL via reaction with zero valent iron (RASL), amorphous ferrous arsenate (PFA), a mixture of PFA and SL (M1), crystalline ferrous arsenate (HPFA), and a mixture of HPFA and SL (M2). The overall arsenic mobility of the tested samples increased in the following order: ASL > RASL > PFA > M1 > HPFA > M2.

show abstract

Leaching Column Tests on Arsenic-Soil Interactions

Cited by 9 publications

References 1 publication

On the Inclusion of Some Biological Impacts and Influences in Coupled Transport Phenomena in Unsaturated Soil

On the Inclusion of Some Biological Impacts and Influences in Coupled Transport Phenomena in Unsaturated Soil

The management of derelict, polluted and contaminated land

Evaluating the Mobility of Arsenic in Synthetic Iron-Containing Solids Using a Modified Sequential Extraction Method

Contact Info

Product

Resources

About