Evaluating the mobility of arsenic in synthetic iron-containing solids u sing a modified sequential extraction method

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Abstract

Many water treatment technologies for arsenic removal that are used today produce arsenic-bearing residuals which are disposed in nonhazardous 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) 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>M>1>HPFA>M >2.

Original languageEnglish (US)
Pages (from-to)238-245
Number of pages8
JournalJournal of Environmental Engineering
Volume136
Issue number2
DOIs
StatePublished - 2010

Fingerprint

Arsenic
extraction method
arsenic
Iron
iron
sludge
arsenate
Leaching
stabilization
Bearings (structural)
Stabilization
leaching
sequential extraction
Land fill
Water treatment
Toxicity
landfill
water treatment
Crystalline materials
toxicity

Keywords

  • Arsenic leaching
  • Arsenic-bearing residual
  • Crystallization
  • Ferrous arsenate
  • Iron oxide
  • Sequential extraction

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry
  • Civil and Structural Engineering

Cite this

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title = "Evaluating the mobility of arsenic in synthetic iron-containing solids u sing a modified sequential extraction method",
abstract = "Many water treatment technologies for arsenic removal that are used today produce arsenic-bearing residuals which are disposed in nonhazardous 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) 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>M>1>HPFA>M >2.",
keywords = "Arsenic leaching, Arsenic-bearing residual, Crystallization, Ferrous arsenate, Iron oxide, Sequential extraction",
author = "Jilei Shan and Saez, {Avelino E} and Ela, {Wendell P}",
year = "2010",
doi = "10.1061/(ASCE)EE.1943-7870.0000136",
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AU - Shan, Jilei

AU - Saez, Avelino E

AU - Ela, Wendell P

PY - 2010

Y1 - 2010

N2 - Many water treatment technologies for arsenic removal that are used today produce arsenic-bearing residuals which are disposed in nonhazardous 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) 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>M>1>HPFA>M >2.

AB - Many water treatment technologies for arsenic removal that are used today produce arsenic-bearing residuals which are disposed in nonhazardous 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) 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>M>1>HPFA>M >2.

KW - Arsenic leaching

KW - Arsenic-bearing residual

KW - Crystallization

KW - Ferrous arsenate

KW - Iron oxide

KW - Sequential extraction

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