Hydrothermal decomposition of PCDDs/PCDFs in MSWI fly ash

Yamaguchi, Hideki; Shibuya, Eiichi; Kanamaru, Yasushi; Uyama, K.; Nishioka, Mamoru; Yamasaki, Nakamichi

doi:10.1016/0045-6535(94)00247-9

Cited by 33 publications

(24 citation statements)

References 4 publications

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“…7 curve in Fig. 3) shows that Cu(0) was the dominant coppercontaining compound due to the redox reaction occurred more effectively with higher temperature and the presence of alkaline ingredients in the solvent (Yamaguchi et al 1996).…”

Section: Discussion On Cu(i) and Cu(0) Formation During The Cu(ii) Rementioning

confidence: 95%

“…Under hydrothermal treatment conditions, concentrations of organic contaminants contained in the fly ash such as PCDDs and PCDFs decreased as a result of dechlorination and redox Table 2 Leaching concentration of fly ash treated by different reaction temperature (mg/L) Initial Cu 2+ concentration=20.00 mg/L, reaction time=2 h reactions occurring to reduce these contaminants (Yamaguchi et al 1996).…”

Section: Discussion On Cu(i) and Cu(0) Formation During The Cu(ii) Rementioning

confidence: 99%

“…Copper oxide has shown catalytic activity on oxidation of organic contaminants (Yamaguchi et al 1996). Yu and Savage (2001) used three different catalysts (bulk MnO 2 , bulk TiO 2 , and CuO/Al 2 O 3 ) to oxidize phenol in supercritical water using a tubular flow reactor.…”

Section: Discussion On Cu(i) and Cu(0) Formation During The Cu(ii) Rementioning

confidence: 99%

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Co-disposal of Heavy Metals Containing Waste Water and Medical Waste Incinerator Fly Ash by Hydrothermal Process with Addition of Sodium Carbonate: A Case Study on Cu(II) Removal

Jin

Chi

et al. 2009

Water Air Soil Pollut

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Fly ash generated from medical waste incinerator and wastewater produced from electroplating plants contains various hazardous contaminants such as heavy metals and chlorinated organic compounds. The primary goal of this research was to investigate the feasibility of removing heavy metals from wastewater using medical waste incinerator fly ash as the treatment reagent with addition of small amount of sodium carbonate (Na 2 CO 3 ) in a hydrothermal process. Copper (Cu) was used as the model heavy metal contaminant in the process. The results revealed that medical waste incinerator fly ash could effectively stabilize Cu(II) ion from wastewater, the crystal phase and simple substance formed during the treatment played a significant role in the fixation of heavy metals in wastewater and fly ash. The heavy metal leachability of treated ash was also measured after removal process. The co-disposal of Cu-containing wastewater and heavy metals-bearing medical waste incinerator fly ash by hydrothermal treatment with addition of a small amount of Na 2 SO 3 was found promising as an effective way of removing Cu from wastewater. The reutilization feasibility of fly ash and the formation mechanism of copper-containing substances were also discussed in this paper.

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Section: Discussion On Cu(i) and Cu(0) Formation During The Cu(ii) Rementioning

confidence: 95%

Section: Discussion On Cu(i) and Cu(0) Formation During The Cu(ii) Rementioning

confidence: 99%

See 1 more Smart Citation

Co-disposal of Heavy Metals Containing Waste Water and Medical Waste Incinerator Fly Ash by Hydrothermal Process with Addition of Sodium Carbonate: A Case Study on Cu(II) Removal

Jin

Chi

et al. 2009

Water Air Soil Pollut

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“…The resulting compounds can be used for immobilizing toxic wastes, and also have the potential to be used as the precursors of new kind of low-energy cements called fly ash belite cements. Furthermore, it has reported that hydrothermal treatment of MSW incinerator fly ash with water or alkaline solution could decompose dioxins such as PCDDs and PCDFs through dechlorination, especially at high temperature [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Extraction of metals from municipal solid waste incinerator fly ash by hydrothermal process

Zhang

Itoh

2006

Journal of Hazardous Materials

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This work examined the extraction properties of metallic elements from municipal incinerator fly ash under hydrothermal conditions. The ash was firstly pre-washed by distilled water, then subjected to hydrothermal treatments. The pre-washing process was effective for Na, K, Ca extraction with extraction percentages of 67%, 76% and 48%, respectively. The optimum contact time was 30 min for the pre-washing process. Five types of acids were tested for the extraction experiments and hydrochloric acid was found to be most effective for metal extraction from the ash. Compared to room condition, hydrothermal treatment accelerated the dissolution of the ash, thus promoted the reaction of acid with hazardous metals such as Cr, Cd, Pb, and furthermore, the consumption speed of acid was slowed down under hydrothermal condition. The acid simultaneously reacted with all the metal in the ash under hydrothermal condition but preferentially reacted with Ca at room condition. The optimum hydrothermal treatment temperature, time and liquid/solid ratio were 150• C, 5 h and 10:1 (ml:g), respectively.

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“…Also Yamaguchi et al (1996) showed that PCDDs/PCDFs decompose completely when the hydrothermal reactions took place when using a 1 N NaOH solution containing 10 vol. % methanol as solvent at T = 300 °C for 20 min and they observed that the treated FA toxicity of PCDDs/PCDFs decreased to 0.03 ng-TEQ/g.…”

Section: Hydrothermal Treatmentmentioning

confidence: 99%