Investigation of Sintering Processes in Bottom Ash to Promote the Reuse in Civil Construction (Part 1) – Element Balance and Leaching

Selinger, A.; Schmidt, V.; Bergfeldt, Britta; Vehlow, J.; Simon, Franz‐Georg

doi:10.1016/s0166-1116(97)80187-2

Cited by 7 publications

(8 citation statements)

References 3 publications

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“…First, it can be done directly at the waste incinerator thereby reducing the costs of building extra treatment facilities (Schneider et al, 1994), Second, high-temperature-induced changes in the bottom ash matrix generally provide both physical and chemical fixation of metals thus making them less accessible to leaching (e.g. Bethanis et al, 2004;Chandler et al, 1997;Selinger et al, 1997). Third, thermal decomposition of residual organic matter causes a decrease in leaching of those elements which have been shown mobilized by organic complexation (e.g.…”

Section: Introductionmentioning

confidence: 99%

Leaching from waste incineration bottom ashes treated in a rotary kiln

et al. 2011

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Leaching from municipal solid waste incineration bottom ash treated in a rotary kiln was quantified using a combination of lab-scale leaching experiments and geochemical modelling. Thermal treatment in the rotary kiln had no significant effect on the leaching of Al, Ba, Ca, Mg, Si, Sr, Zn, sulfate and inorganic carbon. Leaching of these elements from the treated residues remained unchanged and was, in general, controlled by solubility of the same minerals as in the untreated residues. Leaching of Cd, Co, Ni, Ti, Be, Bi, and Sn from both untreated and treated residues was found to be close to or below their detection limits; no effects of the thermal treatment on leachability of these metals were observed. The leaching of Cl, dissolved organic carbon (DOC), Cu and Pb decreased by at least one order of magnitude after the thermal treatment. This could be explained by evaporation (Cl) and by a better burnout of organic matter which then limited metal-DOC complexation and mobility. At the same time, leaching of Mo and Cr appeared to increase by a factor of 4 and more than two orders of magnitude, respectively. The large changes in Cr leaching may be explained by decreases in Al reduction capacity after the thermal treatment. Overall, rotary kiln thermal treatment of bottom ashes can be recommended to reduce the leaching of Cu, Pb, Cl and DOC; however, increased leaching of Cr and Mo should be expected.

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Section: Introductionmentioning

confidence: 99%

Leaching from waste incineration bottom ashes treated in a rotary kiln

et al. 2011

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“…Early studies demonstrated that sintering of different waste materials allows for the immobilization of hazardous metals and destroys the organic pollutants [20][21][22][26][27][28][29], with the simultaneous advantage of achieving a significant reduction in the volume of waste which is around 80-90%.…”

Section: Introductionmentioning

confidence: 99%

“…A number of researchers have demonstrated reduced leaching from sintered products compared to the original waste [16,17,[19][20][21][26][27][28][29][30][31][32][33]. The use of waste incinerator BA to produce ceramics has been already reported [26][27][28]; SS [17,[21][22][23][24] and MSS [16,17] can be processed just like BA, whereas the studies on the ceramurgic processing of DS or their mixtures with other waste materials are not so common. Few studies demonstrated that vitrification of DS is a suitable process for their reuse [29,30].…”

Section: Introductionmentioning

confidence: 99%

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Possible production of ceramic tiles from marine dredging spoils alone and mixed with other waste materials

Baruzzo

Minichelli

Brückner

et al. 2006

Journal of Hazardous Materials

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“…Fulvic and humic acids are known to form mobile organo-metallic complexes with cations of Cu, Pb, Ni and Zn (Pandey et al, 2000), so that removal or destruction of organic substances allows decreasing of the leaching of toxic cations. Additional thermal treatment is applied to oxidise the organic matter and, in some cases, also to obtain a sintered material that can be used in or as building material (Bethanis et al, 2004; Hyks et al, 2011; Selinger et al, 1997; Van Gerven et al, 2006). This treatment was reported to be an effective way to reduce heavy metal leaching, but some authors also observed increased Cr and/or Mo leaching after such thermal treatment (Hyks et al, 2011; Selinger et al, 1997; Van Gerven et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Thermal treatment of solid waste in view of recycling: Chromate and molybdate formation and leaching behaviour

2014

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Elevated Cr and Mo concentrations are often found in leachates of thermally treated solid waste, but there is no general explanation for this so far. Therefore, we studied the leaching behaviour after thermal treatment as a function of heating temperature and residence time for two types of solid waste: contaminated sludge and bottom ash from municipal solid waste incineration. The leaching behaviour of both waste streams was compared with experiments on synthetic samples, allowing deduction of a general mechanism for Cr and Mo leaching. Cr and Mo showed a similar leaching behaviour: after an initial increase, the leaching decreased again at higher temperatures. Oxidation of these elements from their lower oxidation states to chromate and molybdate at temperatures up to 600 °C was responsible for the increased leaching. At higher temperatures, both Mo and Cr leaching decreased again owing to the formation of an amorphous phase, incorporating the newly formed chromate and molybdate salts, which prevents them from leaching.

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Investigation of Sintering Processes in Bottom Ash to Promote the Reuse in Civil Construction (Part 1) – Element Balance and Leaching

Cited by 7 publications

References 3 publications

Leaching from waste incineration bottom ashes treated in a rotary kiln

Leaching from waste incineration bottom ashes treated in a rotary kiln

Possible production of ceramic tiles from marine dredging spoils alone and mixed with other waste materials

Thermal treatment of solid waste in view of recycling: Chromate and molybdate formation and leaching behaviour

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