Dechlorination and destruction of PCDDs/PCDFs in fly ashes from municipal solid waste incinerators by low temperature thermal treatment

Song, Geum Ju; Kim, Seong Heon; Seo, Yong Chil; Kim, Sam Cwan

doi:10.1016/j.chemosphere.2007.09.055

Cited by 49 publications

(19 citation statements)

References 17 publications

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“…When those poly-chlorine congeners lose one or more chlorine atoms without destroying phenyl ring, what's left is most possibly 2,3,7,8-TCDD or 2,3,7,8-TCDF. This result is similar to Youhei Misaka and Geum-Ju Song's work [13,14], where the highly polychlorinated congeners turning to low polychlorinated congeners happened during thermal treatment process for MSWI fly ashes. CHZ contains a nucleophilic double-nitrogen structure; its nitrogen atoms in this structure have isolated electron pairs, which have strong affinity to H + , and then OH -is produced in the solution, which has the similar effect of NaOH addition in the hydrothermal system in Ref.…”

Section: Effect Of Chz Addition On Pcdds/pcdfs Decompositionsupporting

confidence: 93%

Hydrothermal treatment of MSWI fly ash for simultaneous dioxins decomposition and heavy metal stabilization

Xie

Chen

et al. 2010

Front. Environ. Sci. Eng. China

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Researches on the hydrothermal treatment of municipal solid waste incineration (MSWI) fly ash were conducted to eliminate dioxins and stabilize heavy metals. In order to enhance decomposing polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzo-furans (PCDFs) during hydrothermal process, a strong reductant carbohydrazide (CHZ) is introduced. A hydrothermal reactor was set up by mixing raw MSWI fly ash or the pre-treated fly ash with water and then heated to a pre-set temperature; CHZ was spiked into solution according to specially defined dosage. Experimental results showed that under the temperatures of 518 K and 533 K, the decomposition rates of PCDDs/PCDFs were over 80% and 90%, respectively, by total concentration. However, their toxic equivalent (TEQ) decreased only slightly or even increased due to the rising in concentration of congeners 2, 3, 7, 8-TCDD/TCDF, which might be resulted from the highly chlorinated congeners losing their chlorine atoms and being degraded during the hydrothermal process. Better results of TEQ reduction were also obtained under the higher tested temperature of 533 K and reactor with addition of 0.1% wt CHZ was corresponded to the best results. Good stabilization of heavy metals was also obtained in the same hydrothermal process especially when ferrous sulphate was added as auxiliary agent.

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Section: Effect Of Chz Addition On Pcdds/pcdfs Decompositionsupporting

confidence: 93%

Hydrothermal treatment of MSWI fly ash for simultaneous dioxins decomposition and heavy metal stabilization

Xie

Chen

et al. 2010

Front. Environ. Sci. Eng. China

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“…Several methods for dioxin detoxification of incineration fly ash have been proposed both in solid phase [26][27][28][29][30][31][32][33] and in liquid fly ash extracts [34][35][36][37]. Among them, liquid phase catalytic hydrodechlorination (LP-HDC) over Pd supported catalyst is a promising technique for fly ash dioxin degradation since high conversions are obtained after short reaction times under moderate reaction conditions [34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Characterization of fly ash from a hazardous waste incinerator in Medellin, Colombia

Cobo

Gálvez

Conesa

et al. 2009

Journal of Hazardous Materials

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“…Copper and its compounds have been widely applied in the study of dechlorination reactions and have achieved good results. [12][13][14] For instance, Huang et al have reported that a CuO modified USY zeolite possessed good activity and high selectivity for Cl-VOC decomposition. 15 Adding ceria as a promoter to copper oxide has many advantages for catalytic performance: 1) it stabilizes the dispersion of the active Cu phase; 16 2) it acts as an oxygen storing phase (Ce 3+ /Ce 4+ ) and strongly affects the copper redox properties; [17][18][19][20] and 3) it creates structural defects and improves the oxygen storage capacity and diffusivity.…”

Section: Introductionmentioning

confidence: 99%

Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

Chen

et al. 2013

RSC Adv.

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SBA-16 silica with intact surface hydroxyl groups was quickly obtained (5 min) via a fast-microwaveassisted method, and further adopted as an efficient template for the synthesis of three-dimensional (3D) ordered mesoporous CuO x -CeO 2 catalysts (htpCCx) through a simple and reproducible host-guest interaction. XRD, XPS, H 2 -TPR, and Raman results reveal that many of the Cu 2+ ions in htpCCx are incorporated into the CeO 2 lattice, leading to the formation of a Cu x Ce 12x O 22d solid solution, which produces a large number of oxygen vacancies and enhances the reducibility of the metal. The interaction of Cu and Ce is essential to the reaction as it maintains the Cu 2+ /Cu 1+ and Ce 4+ /Ce 3+ redox couples. The catalyst has a 3D mesostructure and possesses remarkably enhanced low-temperature activity for the combustion of epichlorohydrin. HtpCC20 has been identified as the most powerful catalyst for this reaction, with the reaction rate at 165 uC being about 6.3 and 33.3 times higher than those of catalysts synthesized using conventional incipient impregnation and thermal combustion methods, respectively. Furthermore, htpCC20 shows superior CO 2 selectivity (.99%) and stability (no deactivation occurs after 50 h reaction). It is believed that the dispersion of the active phase, density of surface active oxygen, and lowtemperature reducibility are the dominant factors governing the catalytic performance.

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Dechlorination and destruction of PCDDs/PCDFs in fly ashes from municipal solid waste incinerators by low temperature thermal treatment

Cited by 49 publications

References 17 publications

Hydrothermal treatment of MSWI fly ash for simultaneous dioxins decomposition and heavy metal stabilization

Hydrothermal treatment of MSWI fly ash for simultaneous dioxins decomposition and heavy metal stabilization

Characterization of fly ash from a hazardous waste incinerator in Medellin, Colombia

Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

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