Impacts of Changing Operational Parameters of In Situ Chemical Oxidation (ISCO) on Removal of Aged PAHs from Soil

Cajal-Mariñosa, Paula; Calle, Ruth G. de la; Rivas, Francisco Javier; Tuhkanen, Tuula

doi:10.1515/jaots-2012-0223

Cited by 3 publications

(4 citation statements)

References 2 publications

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“…Hydrogen peroxide is hazardous since its decomposition is highly exothermic, then slow-release compounds have been developed, namely sodium percarbonate [27,28]. It has seldom been used for PAH remediation and was less effective than catalysed hydrogen peroxide [29]. More recently, sulfate radical, a strong oxidant (standard oxidation potential 2.6 V) obtained by activation of sodium persulfate has been tested for pollutant removal [9-11, 15, 30-32].…”

Section: Introductionmentioning

confidence: 99%

Oxidant selection to treat an aged PAH contaminated soil by in situ chemical oxidation

Lemaire

Buès

Kabeche

et al. 2013

Journal of Environmental Chemical Engineering

103

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This work is a part of the OXYSOL project aiming at the conception of a global treatment pathway including In Situ Chemical Oxidation to clean up soils of former metallurgical sites.It deals with the selection of the most adapted oxidants. Batch experiments were performed with aged contaminated soil samples of a former steel-making plant to degrade the 16 US 1 EPA PAHs. In this research, hydrogen peroxide, modified Fenton's reaction, potassium permanganate, sodium percarbonate and sodium persulfate were compared at high and moderate doses. Hydrogen peroxide, modified Fenton's reagent, percarbonate and activated persulfate led to a maximum degradation ratio of 45%. A higher ratio (70%) was obtained with a high dose of permanganate. Except for permanganate, increasing oxidant dose did not improve degradation rates, especially with radical-based oxidative systems probably due to radical scavenging. Oxidant doses had an effect on pH that drastically increased or dropped in some cases, which was a drawback. Permanganate efficacy was mainly assigned to its persistence. In all cases, the low availability of PAHs, partly sequestrated in the aged soil, was identified as the most limiting factor for degradation performance. Oxidants were ranked according to their efficiency for PAH oxidation in soils. Efficiency was not correlated to the doses.

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Section: Introductionmentioning

confidence: 99%

Oxidant selection to treat an aged PAH contaminated soil by in situ chemical oxidation

Lemaire

Buès

Kabeche

et al. 2013

Journal of Environmental Chemical Engineering

103

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“…Em subsuperfície, o PCS tende a percolar por todo o perfil de solo, reagindo com a matriz do solo e a matéria orgânica natural (MON) (DE LA CALLE et al 2012, CAJAL-MARIÑOSA et al 2012, LEMAIRE et al 2013, VIISIMAA & GOI 2014, APUL et al 2016, SILVA, 2016. Em um estudo em uma coluna de solo arenoso com 2,5% de carbono orgânico total (COT), contaminada por creosoto, CAJAL-MARIÑOSA et al (2012) indicaram que a oxidação pode promover a mobilização dos contaminantes, mas esse efeito foi menos pronunciado com a aplicação de PCS que do reagente Fenton. Os autores também ressaltaram uma grande heterogeneidade na distribuição dos oxidantes, impactando na eficiência da técnica.…”

Section: Ativação Por Ferro (Iii)unclassified

“…Os autores também observaram que em condições de baixa temperatura (<60 ºC), a remoção de acenafteno e do antraceno foram maiores quando comparado a altas temperaturas. De forma semelhante, CAJAL-MARIÑOSA et al (2012) também avaliaram a degradação de HPAs em colunas de solo arenoso contaminado com creosoto, em temperaturas variando de 40 a 80 ºC. O melhor valor de degradação obtida com o PCS foi de 53%, sob uma temperatura de 40 ºC, confirmando que o PCS atinge maiores eficiências em temperaturas inferiores a 60 ºC.…”

Section: Hidrocarbonetos Policíclicos Aromáticos (Hpas)unclassified

Fundamentos e aplicação do percarbonato de sódio para remediação de solos e águas subterrâneas por oxidação química

Pereira¹,

Freitas²

2020

Rev. Inst. Geol.

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O percarbonato de sódio (PCS) é um oxidante com aplicação recente para a remediação de solos e água subterrâneas. Por ser um composto à base de peróxido de hidrogênio, o PCS possui potencial para degradar uma grande variedade de contaminantes, mas ainda é relativamente pouco conhecido e estudado. Esse trabalho apresenta uma revisão das suas principais propriedades, reações e fatores que interferem na sua aplicação na remediação ambiental. Os estudos de diversos autores foram compilados para levantar informações sobre reações com diferentes tipos de contaminantes, dosagens, uso de ativadores e quelantes. O PCS apresenta capacidade de degradar de forma eficiente alguns hidrocarbonetos aromáticos, incluindo benzeno, hidrocarbonetos policíclicos aromáticos e solventes clorados, entre outros. Verificou-se que o uso de ativadores propiciou a geração do radical hidroxila com maior velocidade e intensidade. Outras espécies reativas de oxigênio, como os radicais hidroperoxila e o ânion superóxido, também são formadas e auxiliam na degradação dos contaminantes, apesar de não possuírem o mesmo potencial de oxidação do radical hidroxila. Diferentes ativadores são citados na literatura como eficientes, como Fe(II) e Fe(III). O uso de agentes quelantes também resulta em maior eficiência, principalmente o ácido citrico, ácido oxálico e EDDS (ácido etilenodiamino-N,N’-dissuccínico – C10H16N2O8). No entanto, a análise dos estudos publicados torna evidente que as condições para obtenção de bons resultados são extremamente dependentes das condições específicas da área, como íons dissolvidos, presença de matéria orgânica e interações com diferentes minerais. Além disso, existe um número reduzido de informações sobre a interação do PCS com diferentes minerais e solos.

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“…Percarbonate is available as sodium percarbonate (2Na 2 CO 3 .3H 2 O 2 ) and has become more popular as an alternative for conventional H 2 O 2 ( Ma et al., 2018 ). Recent studies suggest that sodium percarbonate is effective in degrading organic pollutants both in soil ( Apul et al., 2016 ; Cajal-Mariñosa et al., 2012 ; Viisimaa and Goi, 2014 ) and water ( Cui et al., 2017 ; Danish et al., 2017 ; Fu et al., 2015 ; Miao et al., 2015a ; Miao et al., 2015c ) over a wider range of pH as compared to that of H 2 O 2 . Sodium percarbonate is also more stable than H 2 O 2 ; however, despite these advantages, relatively few studies are on the effectiveness of sodium percarbonate for degrading the organic contaminants in the subsurface environment ( Ma et al., 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the effects of in-situ chemical oxidation on microbial activity using Pseudomonas putida F1

Dangi

Urynowicz

Schultz³

et al. 2021

Heliyon

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In-situ chemical oxidation is an effective groundwater remediation approach for delivering oxidants to the subsurface environment where various contaminants of concern, natural organic matter, and other reduced species within the soil consume the oxidants. The addition of these oxidants alters microbial activity changing the physical and chemical structure of the soil. This paper studied the effects of chemical oxidation on microbial activity with and without toluene. Several oxidants were used as part of the study: sodium percarbonate, hydrogen peroxide, potassium permanganate, and sodium persulfate evaluated at low, medium, and high concentrations. A series of biometer experiments seeded with microbe Pseudomonas putida F1 and soil sample and aqueous toluene solution for each oxidant was monitored by CO 2 production as a function of incubation days to evaluate the effects of oxidation on the microbial activity. Of the oxidants tested, permanganate oxidation resulted in the highest increase in microbial activity post oxidation based on CO 2 production both with and without the addition of toluene. The other oxidants exhibited a direct correlation between oxidant concentration and the change in permanganate chemical oxidant demand of the soil. However, there was no correlation between oxidant concentration and microbial activity. Each of the oxidants was shown to increase CO 2 yield except for sodium percarbonate, which had an adverse effect on microbial activity. It is likely that the increased microbial activity associated with permanganate oxidation was the result of chemical reactions between the oxidant and natural organic matter in the soil.

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Impacts of Changing Operational Parameters of In Situ Chemical Oxidation (ISCO) on Removal of Aged PAHs from Soil

Cited by 3 publications

References 2 publications

Oxidant selection to treat an aged PAH contaminated soil by in situ chemical oxidation

Oxidant selection to treat an aged PAH contaminated soil by in situ chemical oxidation

Fundamentos e aplicação do percarbonato de sódio para remediação de solos e águas subterrâneas por oxidação química

Analysis of the effects of in-situ chemical oxidation on microbial activity using Pseudomonas putida F1

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