Simultaneous removal of PCDD/Fs, pentachlorophenol and mercury from contaminated soil

Hung, Pao Chen; Chang, S. L.; Ou-Yang, Chia Chien; Chang, Moo Been

doi:10.1016/j.chemosphere.2015.08.058

Cited by 34 publications

(12 citation statements)

References 25 publications

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“…However, at temperatures lower than 400°C, the application of thermal desorption to soils contaminated with chlorinated compounds may result in the formation of highly toxic compounds such as 2,3,7,8-tetra-CDD (Speir et al, 1997;). In addition, an inadequate retention time may lead to increased toxicity of the PCDDF compounds present in soils due to their incomplete destruction (Hung et al, 2016). Bioremediation methods have been used to remediate contaminated soils (Liu et al, 2014;Tu et al, 2014;Zhen et al, 2014), but they are not effective at removing toxic compounds such as PCDDF and inorganic contaminants when they are present in high concentrations.…”

Section: Introductionmentioning

confidence: 99%

Counter-Current Attrition Process (CCAP) to Remove Metals, Pentachlorophenol (PCP), Dioxins and Furans (PCDDF) from the 1-4-mm Fraction of Contaminated Soil

Guemiza

Coudert

Tran

et al. 2017

Soil and Sediment Contamination: An International Journal

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The objective of this study was to evaluate the potential of a counter-current attrition process (CCAP) over 15 cycles for removing metals, pentachlorophenol (PCP) and polychlorinated dibenzo-p-dioxins and-furans (PCDDF) from contaminated soil. The CCAP, applied to the 1-4mm fraction of a contaminated soil, included five attrition steps (pulp density (PD) = 40% (w w-1), surfactant [BW] = 2% (w w-1), t = 20 min, T = 20°C) followed by one rinsing step. The water emerging from the first attrition step was treated using flocculation in the presence of 0.04 g CMX 123 (commercial flocculent) L-1 before being reintroduced into the CCAP. The CCAP including the treatment of attrition wastewater (ATW) by flocculation achieved a removal of 44 ± 5% As, 26 ± 6% Cr, 24 ± 5% Cu, 49 ± 4% PCP and 45 ± 3% PCDDF. Moreover, the CCAP enabled a significant reduction (78%) in the amount of water required (around 14.5 m 3 of water per ton of the 1-4-mm soil fraction). The high removal yields obtained after 15 attrition cycles of the CCAP for PCP and PCDDF and the significant reduction of water consumption confirm that this CCAP can be considered for industrial applications.

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Section: Introductionmentioning

confidence: 99%

Counter-Current Attrition Process (CCAP) to Remove Metals, Pentachlorophenol (PCP), Dioxins and Furans (PCDDF) from the 1-4-mm Fraction of Contaminated Soil

Guemiza

Coudert

Tran

et al. 2017

Soil and Sediment Contamination: An International Journal

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“…Tel. : +86 571 87953385; Fax: +86 571 87952428 E-mail address: linxiaoqing@zju.edu.cn the flue gas emissions control and fly ash treatment, many technologies have been investigated e.g., biodegradation (Mori and Kondo, 2002), catalytic destruction of PCDD/F , adsorption on carbon materials and thermal treatment (Hung et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

PCDD/F Formation in Milled Fly Ash: Metal Chloride Catalysis

Mubeen

Buekens

Cao

et al. 2017

Aerosol Air Qual. Res.

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Mechanochemical treatment reduces the particle size of fly ash and disperses catalytic metals, raising the potential reactivity of fly ash to form and destroy 'dioxins', i.e., polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD + PCDF or PCDD/F). To test this issue, model fly ash (MFA) samples were artificially composed by mixing silica, sodium chloride, and activated carbon, and doping this matrix with five selected catalytic metal chlorides administered as CuCl 2 •2H 2 O, CrCl 3 •6H 2 O, FeCl 3 (anhydrous), ZnCl 2 and anhydrous CaCl 2 . Without additives, these samples were first finely milled for 0 (blank), 1 and 8 h, and the effect on the formation of PCDD/F was investigated during de novo tests. These simulate the conditions prevailing in deposits in the heat-recovery zone of an incinerator, where dioxins are formed and destroyed, and the tests were conducted at the same temperature, reaction time and air flow rate. Metal chlorides produce specific and distinct homologue and isomer patterns. The isomer signatures of 2,3,7,8-PCDD/F, precursor route, and other congeners were recognised and are studied in some detail. Principal component analysis (PCA) was applied to the 2,3,7,8-PCDD/F-congeners, indicating CuCl 2 as major contributor of WHO2005-TEQ values. Surprisingly, for CuCl 2 •2H 2 O the total yield of dioxins reduced drastically with milling. Since this study revealed various unexpected results, as well as experimental limitations, some suggestions for further ongoing work are formulated.

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“…In China, the major source of PCDD/Fs emissions is municipal waste incineration (Zhou et al, 2015a). Adsorption on activated carbon (Everaert et al, 2003), catalytic (Yu et al, 2016a) and thermal treatment (Hung et al, 2016) and biodegradation (Mori and Kondo, 2002) were developed to control dioxin emissions. However, those technologies are expensive and generally require other pretreatment, except for adsorption.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on PCDD/Fs Adsorption onto Nano-Graphite

Lin

et al. 2016

Aerosol Air Qual. Res.

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The adsorption of the 17 toxic 2,3,7,8-substituted dioxin congeners onto graphite was investigated using a laboratoryscale fixed-bed adsorption system. First, the morphology and microstructure of graphite were characterized by Scanning Electron Microscopy and Brunauer-Emmer-Teller surface estimation. Removal efficiency of the 17 toxic PCDD/Fs varies from 89.31% to 99.96% and the amount adsorbed on graphite is a linear function of the inlet concentration of PCDD/Fs, as it was varied from 2.3-20.7 ng I-TEQ Nm -3 . Operating over 3 hours, it is observed that the saturation time of fixed-bed adsorbers is less when the inlet concentration is higher. The removal efficiency of dioxin depends on vapour pressure and rises strongly with increasing chlorine substitution number. Removal efficiencies strongly correlate with vapour pressure, with R 2 0.96 for PCDDs and 0.99 for PCDFs, respectively. The removal efficiency of dioxin decreases linearly as the temperature increased (R 2 = 0.99). Possibly, π-π interactions between PCDD/Fs and graphite sheets lead to a high adsorption capacity of dioxin. The high mesopores volume and pore structure of graphite are critical factors when adsorbing dioxin.

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Simultaneous removal of PCDD/Fs, pentachlorophenol and mercury from contaminated soil

Cited by 34 publications

References 25 publications

Counter-Current Attrition Process (CCAP) to Remove Metals, Pentachlorophenol (PCP), Dioxins and Furans (PCDDF) from the 1-4-mm Fraction of Contaminated Soil

Counter-Current Attrition Process (CCAP) to Remove Metals, Pentachlorophenol (PCP), Dioxins and Furans (PCDDF) from the 1-4-mm Fraction of Contaminated Soil

PCDD/F Formation in Milled Fly Ash: Metal Chloride Catalysis

Experimental Study on PCDD/Fs Adsorption onto Nano-Graphite

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