Remediation of Hg-contaminated marine sediments by simultaneous application of enhancing agents and microwave heating (MWH)

Pietro P. Falciglia, Danilo Malarbi, Riccardo Maddalena, Valentina Greco, Federico G.A. Vagliasindi

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The aim of this work was to investigate Hg removal ability of a novel microwave heating (MWH) treatment for marine sediment remediation enhanced by the application of several agents, biodegradable complexing agent (methylglycinediacetic acid, MGDA), surfactant (Tween® 80), and citric acid. Main results revealed that MWH allowed a very rapid heating (∼450 °C in 7 min) of the irradiated medium. However, without the addition of enhancing agents, a maximum Hg removal of ∼72% can be achieved. The application of MGDA led to a higher contaminant removal of ∼87% (residual concentration = 5.4 mg kg−1). For the treatment including the simultaneous addition of both chelating agent and surfactant, their synergetic action and stripping processes resulted in a very high Hg removal of ∼99% for an irradiation time of 7 min, corresponding to a residual concentration of 0.56 mg kg−1, which is lower than the Italian regulatory limit of 1 mg kg−1. The use of citric acid resulted in a shortening of the removal kinetics, which allowed the successful application of a shorter remediation time of 5 min. The observed strong passive ability of sediments to convert a microwave irradiation energy into a rapid and large temperature increase undoubtedly represents a key factor in the whole remediation process, making the studied treatment an excellent choice. Kinetic data are suitable for a preliminarily assessment of the effectiveness of clean-up activities, and as basis for future scaling-up studies on MWH of Hg-contaminated sediments
LanguageEnglish
Pages1-10
Number of pages10
JournalChemical Engineering Journal
Volume321
Early online date22 Mar 2017
DOIs
Publication statusPublished - 1 Aug 2017

Fingerprint

Microwave heating
Remediation
marine sediment
Sediments
remediation
heating
citric acid
Citric acid
Surface-Active Agents
Citric Acid
surfactant
irradiation
Surface active agents
kinetics
Kinetics
Acids
Microwave irradiation
chelating agent
Polysorbates
acid

Keywords

  • citric acid
  • marine sediment
  • non-ionic surfactant
  • MGDA
  • mercury (Hg)
  • microwave heating (MWH)

Cite this

Falciglia, Pietro P. ; Malarbi, Danilo ; Maddalena, Riccardo ; Greco, Valentina ; Vagliasindi, Federico G.A. / Remediation of Hg-contaminated marine sediments by simultaneous application of enhancing agents and microwave heating (MWH). In: Chemical Engineering Journal. 2017 ; Vol. 321. pp. 1-10.
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abstract = "The aim of this work was to investigate Hg removal ability of a novel microwave heating (MWH) treatment for marine sediment remediation enhanced by the application of several agents, biodegradable complexing agent (methylglycinediacetic acid, MGDA), surfactant (Tween{\circledR} 80), and citric acid. Main results revealed that MWH allowed a very rapid heating (∼450 °C in 7 min) of the irradiated medium. However, without the addition of enhancing agents, a maximum Hg removal of ∼72{\%} can be achieved. The application of MGDA led to a higher contaminant removal of ∼87{\%} (residual concentration = 5.4 mg kg−1). For the treatment including the simultaneous addition of both chelating agent and surfactant, their synergetic action and stripping processes resulted in a very high Hg removal of ∼99{\%} for an irradiation time of 7 min, corresponding to a residual concentration of 0.56 mg kg−1, which is lower than the Italian regulatory limit of 1 mg kg−1. The use of citric acid resulted in a shortening of the removal kinetics, which allowed the successful application of a shorter remediation time of 5 min. The observed strong passive ability of sediments to convert a microwave irradiation energy into a rapid and large temperature increase undoubtedly represents a key factor in the whole remediation process, making the studied treatment an excellent choice. Kinetic data are suitable for a preliminarily assessment of the effectiveness of clean-up activities, and as basis for future scaling-up studies on MWH of Hg-contaminated sediments",
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Remediation of Hg-contaminated marine sediments by simultaneous application of enhancing agents and microwave heating (MWH). / Falciglia, Pietro P.; Malarbi, Danilo; Maddalena, Riccardo; Greco, Valentina; Vagliasindi, Federico G.A.

In: Chemical Engineering Journal, Vol. 321, 01.08.2017, p. 1-10.

Research output: Contribution to journalArticle

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T1 - Remediation of Hg-contaminated marine sediments by simultaneous application of enhancing agents and microwave heating (MWH)

AU - Falciglia, Pietro P.

AU - Malarbi, Danilo

AU - Maddalena, Riccardo

AU - Greco, Valentina

AU - Vagliasindi, Federico G.A.

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Y1 - 2017/8/1

N2 - The aim of this work was to investigate Hg removal ability of a novel microwave heating (MWH) treatment for marine sediment remediation enhanced by the application of several agents, biodegradable complexing agent (methylglycinediacetic acid, MGDA), surfactant (Tween® 80), and citric acid. Main results revealed that MWH allowed a very rapid heating (∼450 °C in 7 min) of the irradiated medium. However, without the addition of enhancing agents, a maximum Hg removal of ∼72% can be achieved. The application of MGDA led to a higher contaminant removal of ∼87% (residual concentration = 5.4 mg kg−1). For the treatment including the simultaneous addition of both chelating agent and surfactant, their synergetic action and stripping processes resulted in a very high Hg removal of ∼99% for an irradiation time of 7 min, corresponding to a residual concentration of 0.56 mg kg−1, which is lower than the Italian regulatory limit of 1 mg kg−1. The use of citric acid resulted in a shortening of the removal kinetics, which allowed the successful application of a shorter remediation time of 5 min. The observed strong passive ability of sediments to convert a microwave irradiation energy into a rapid and large temperature increase undoubtedly represents a key factor in the whole remediation process, making the studied treatment an excellent choice. Kinetic data are suitable for a preliminarily assessment of the effectiveness of clean-up activities, and as basis for future scaling-up studies on MWH of Hg-contaminated sediments

AB - The aim of this work was to investigate Hg removal ability of a novel microwave heating (MWH) treatment for marine sediment remediation enhanced by the application of several agents, biodegradable complexing agent (methylglycinediacetic acid, MGDA), surfactant (Tween® 80), and citric acid. Main results revealed that MWH allowed a very rapid heating (∼450 °C in 7 min) of the irradiated medium. However, without the addition of enhancing agents, a maximum Hg removal of ∼72% can be achieved. The application of MGDA led to a higher contaminant removal of ∼87% (residual concentration = 5.4 mg kg−1). For the treatment including the simultaneous addition of both chelating agent and surfactant, their synergetic action and stripping processes resulted in a very high Hg removal of ∼99% for an irradiation time of 7 min, corresponding to a residual concentration of 0.56 mg kg−1, which is lower than the Italian regulatory limit of 1 mg kg−1. The use of citric acid resulted in a shortening of the removal kinetics, which allowed the successful application of a shorter remediation time of 5 min. The observed strong passive ability of sediments to convert a microwave irradiation energy into a rapid and large temperature increase undoubtedly represents a key factor in the whole remediation process, making the studied treatment an excellent choice. Kinetic data are suitable for a preliminarily assessment of the effectiveness of clean-up activities, and as basis for future scaling-up studies on MWH of Hg-contaminated sediments

KW - citric acid

KW - marine sediment

KW - non-ionic surfactant

KW - MGDA

KW - mercury (Hg)

KW - microwave heating (MWH)

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T2 - Chemical Engineering Journal

JF - Chemical Engineering Journal

SN - 1385-8947

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