Volatilisation of trace elements for coal–sewage sludge blends during their combustion☆

Folgueras, M.B.; Dı́az, R.; Xiberta, Jorge; Prieto, Ismael

doi:10.1016/s0016-2361(03)00152-2

Cited by 63 publications

(45 citation statements)

References 9 publications

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“…In Figure 4, the other sinks of trace elements in food waste might be caused by the volatilization of some volatile trace element compounds or the experimental loss during the heat treatment or drying processes (Ramaroson et al, 2008). In the study, the slight volatilization of trace elements could be thought to be relevant to the high organics as well as Cl contents of food waste due to the probable formation of volatile chlorides (Folgueras et al, 2003), except for the emission features of some volatile elements, such as Hg, which is very volatile, Pb and Cd, which are partially volatile. Furthermore, Cr has properties of both very volatile and hardly volatile with different chemical speciation (Huang et al, 2004).…”

Section: Resultsmentioning

confidence: 99%

A study of the impact of moist-heat and dry-heat treatment processes on hazardous trace elements migration in food waste

Chen

Jin

Qiu

et al. 2014

Journal of the Air & Waste Management Association

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Using laboratory experiments, the authors investigated the impact of dry-heat and moist-heat treatment processes on hazardous trace elements (As, Hg, Cd, Cr, and Pb) in food waste and explored their distribution patterns for three waste components: oil, aqueous, and solid components. The results indicated that an insignificant reduction of hazardous trace elements in heat-treated waste-0.61-14.29% after moist-heat treatment and 4.53-12.25% after dry-heat treatment-and a significant reduction in hazardous trace elements (except for Hg without external addition) after centrifugal dehydration (P < 0.5). Moreover, after heat treatment, over 90% of the hazardous trace elements in the waste were detected in the aqueous and solid components, whereas only a trace amount of hazardous trace elements was detected in the oil component (<0.01%). In addition, results indicated that heat treatment process did not significantly reduce the concentration of hazardous trace elements in food waste, but the separation process for solid and aqueous components, such as centrifugal dehydration, could reduce the risk considerably. Finally, combined with the separation technology for solid and liquid components, dry-heat treatment is superior to moist-heat treatment on the removal of external water-soluble ionic hazardous trace elements.Implications: An insignificant reduction of hazardous trace elements in heat-treated waste showed that heat treatment does not reduce trace elements contamination in food waste considerably, whereas the separation process for solid and aqueous components, such as centrifugal dehydration, could reduce the risk significantly. Moreover, combined with the separation technology for solid and liquid components, dry-heat treatment is superior to moist-heat treatment for the removal of external water-soluble ionic hazardous trace elements, by exploring distribution patterns of trace elements in three waste components: oil, aqueous, and solid components.

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Section: Resultsmentioning

confidence: 99%

A study of the impact of moist-heat and dry-heat treatment processes on hazardous trace elements migration in food waste

Chen

Jin

Qiu

et al. 2014

Journal of the Air & Waste Management Association

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“…The elevation of residual Zn in the combustion wastes was probably caused by the reactions between Zn (in particular, sulphide Zn) and iron oxides and/or silicates during combustion. Previous studies have reported the formation of stable ZnO.Fe 2 O 3 (s) through interactions between Zn and iron oxides (Folgueras et al, 2003). Then high concentration of iron oxides in the combustion system could have facilitated Zn and iron oxide interactions.…”

Section: Discussionmentioning

confidence: 98%

Speciation of some selected heavy metals in coal bottom ash from Okaba Coal, Ankpa, Nigeria

Okorie¹,

Egila²,

Jacob³

2014

Int. J. Bio. Chem. Sci

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Speciation of coal cotton ash from Okaba in Kogi State Nigeria was carried out using flame atomic absorption spectrometry. Results of this research showed that the elements studied (Cr, Fe, Cu, Ni, Pb, Cd and Zn) were all observed in at least three fractions of the sequential extraction procedure. Pb showed more presence in the exchangeable fraction (80±0.03 µg/g) which is a serious problem to plants and human due to weathering activities in the soil. Most of the elements with high concentration in the residual fractions were found to be thermally stable and of low volatility (Cu and Zn). Chromium occurred mostly as a reducible fraction (80±0.02 µg/g) while Fe occurred mostly as bound to carbonate species. Cadmium was generally low in all the fractions analysed. This trend may be attributed to high volatility of Cd species. Similarly, Ni had a distribution in all the fractions with the highest in the reducible fraction (39±0.01 µg/g) and lowest in the carbonate bound fraction (24 ±0.01 µg/g). The exchangeable fraction of the elements studied is consistent with previous studies of coal bottom ash speciation. The ash matrix may also have contributed to a significant rise in the concentration of Ni at the exchangeable fraction thereby leading to significant variations in metal concentration over the ash particle.

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“…The conventional uses of sewage sludges include industrial utilization, landfill, individual combustion [1] or with coal [2] and composting for farmland utilization [3]. Combustion of sewage sludges need rigid controls on the volatile pollutants generated [1,2] and farmland application is limited by the potential pollution of the metals present in the sewage sludges [3].…”

Section: Introductionmentioning

confidence: 99%

“…Combustion of sewage sludges need rigid controls on the volatile pollutants generated [1,2] and farmland application is limited by the potential pollution of the metals present in the sewage sludges [3]. Landfill has been a major option in disposal of sewage sludge for a long time, but it is not sustainable due to the increasing competition for landfill space, higher costs and more stringent environmental standards applied, especially in the European countries [4].…”

Section: Introductionmentioning

confidence: 99%

The effect of acid treatment on the pyrolysis behavior of sewage sludges

Gascó¹,

Cueto²,

Méndez³

2007

Journal of Analytical and Applied Pyrolysis

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Volatilisation of trace elements for coal–sewage sludge blends during their combustion☆

Cited by 63 publications

References 9 publications

A study of the impact of moist-heat and dry-heat treatment processes on hazardous trace elements migration in food waste

A study of the impact of moist-heat and dry-heat treatment processes on hazardous trace elements migration in food waste

Speciation of some selected heavy metals in coal bottom ash from Okaba Coal, Ankpa, Nigeria

The effect of acid treatment on the pyrolysis behavior of sewage sludges

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