A new nanotechnology of fly ash inertization based on the use of silica gel extracted from rice husk ash and microwave treatment

Bosio, Alberto; Gianoncelli, Alessandra; Zacco, Annalisa; Borgese, Laura; Rodella, N.; Zanotti, Davide; Depero, Laura E.; Siviero, G.; Cinosi, Amedeo; Bingham, Paul A.; Bontempi, Elza

doi:10.1177/1740349913490683

Cited by 9 publications

(17 citation statements)

References 15 publications

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“…The relevant amount of SiO 2 makes this kind of ash highly porous and lightweight, with a very high external surface area. Moreover, this waste ash material may be used as a precursor of silica gel [39,40]. The efficiency of heavy metal stabilization from MSWI fly ash using RHA during the COSMOS-RICE (Colloidal Silica Medium to obtain Safe Inert, from RICE husk ash) project has already been proven [32,40].…”

Section: Rice Husk Ash (Rha)mentioning

confidence: 99%

Review of the Reuse Possibilities Concerning Ash Residues from Thermal Process in a Medium-Sized Urban System in Northern Italy

et al. 2020

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This review paper reports a detailed characterization of some combustion or incineration residues and by-products produced in a medium-sized city in Northern Italy. The municipal solid waste incineration (MSWI) generates fly ash, which is a toxic waste. Coal fly ash (CFA) and flue gas desulfurization (FGD) derive from the thermoelectric coal plant located in the same city. Along with these ashes, silica fume and rice husk ash are also considered for the stabilization of fly ash based on their amorphous silica content with the aim to convert them into an inert material. The characterization of all the investigated ashes was performed using different techniques: X-ray diffraction, total reflection X-ray fluorescence, scanning electron microscopy, and transmission electron microscopy. The aim of this work is to describe the reuse possibilities that were proposed for these ashes, which were determined also on the basis of their structural properties. Several possible applications of the investigated ashes are proposed, and the most suitable reuse of stabilized fly ash samples seems to be the production of sustainable plastic composites. This paper shows that the reuse of the by-product materials can allow natural resources to be preserved following the principles of a circular economy.

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Section: Rice Husk Ash (Rha)mentioning

confidence: 99%

Review of the Reuse Possibilities Concerning Ash Residues from Thermal Process in a Medium-Sized Urban System in Northern Italy

et al. 2020

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“…The heavy metal stabilization mechanism, which involves the action of amorphous silica, has been reported and discussed in detail (Bosio, Gianoncelli, et al, ; Bosio et al, ; Bontempi et al, ). It can be explained by the capability of amorphous silica to trap heavy metals.…”

Section: Resultsmentioning

confidence: 99%

“…The XRD pattern of RHA (not reported here) highlights the presence of an amorphous phase (amorphous silica) and quartz (Benassi et al, ). Coal fly ash contains quartz and mullite as crystalline phases (Bosio, Gianoncelli, et al, ), whereas MSWI fly ash primarily contains calcite, calcium chloride hydroxide, sodium chloride, and potassium chloride. Wood ash mainly contains calcite, calcium oxide, and calcium hydroxide.…”

Section: Resultsmentioning

confidence: 99%

“…It can be explained by the capability of amorphous silica to trap heavy metals. Indeed, it has already been shown that the amorphous silica naturally contained in RHA can be extracted under alkaline conditions as sodium silicate and reused as a heavy metal stabilizer (Bosio, Gianoncelli, et al, 2014). The metal ion trapping can be explained by considering a cation exchange reaction involving the substitution of protons from silanol groups present on the surface of silica by the metal ions from the solution (Srivastava, Mall, & Mishra, 2006).…”

Section: Resultsmentioning

confidence: 99%

“…RHA was chosen as a metal stabilizer based on its capability for heavy metals stabilization (Bosio, Gianoncelli, et al, 2014). Coal fly ash was also used in the stabilization procedure because this ash is already used as soil fertilizer (Shaheen, Hooda, & Tsadilas, 2014).…”

Section: Methodsmentioning

confidence: 99%

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Stabilized biomass ash as a sustainable substitute for commercial P‐fertilizers

et al. 2018

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The reuse of biomass ash as a fertilizer is generally recognized as good practice with several environmental benefits. However, the possible presence of leachable heavy metals in this ash limits the potential extent of its application and the implementation of an appropriate legal framework. For the first time, a method to stabilize wood ash based on the use of other by‐products (coal fly ash and rice husk ash) is presented. No commercial chemicals are employed in the procedure. The results show that despite the initial presence of leachable heavy metals in the ash, the final obtained material is stable. In addition, the lowering of pH (from 13.5 to approximately 7.5) due to carbonation reactions and the addition of Ca‐rich ash increases the phosphorous availability compared with the starting wood ash and makes the obtained material suitable for use in soil fertilization. The sustainability of the new proposed technology is quantitatively discussed with regard to the differences in embodied energy and CO2 footprint of phosphorous between raw materials and stabilized wood ash. This work shows that the prospects for energy saving and CO2 footprint reduction using stabilized wood ash as a substitute for inorganic commercial P‐fertilizers are significant and offer a new way to reach these objectives. The simplicity of the method and the general availability of the by‐products employed in the stabilization also render the procedure suitable for applications in developing countries.

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Case Study of Raw Materials Substitution: Natural Fillers Substitution in Plastic Composites

Bontempi

2017

Raw Materials Substitution Sustainability

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A new nanotechnology of fly ash inertization based on the use of silica gel extracted from rice husk ash and microwave treatment

Cited by 9 publications

References 15 publications

Review of the Reuse Possibilities Concerning Ash Residues from Thermal Process in a Medium-Sized Urban System in Northern Italy

Review of the Reuse Possibilities Concerning Ash Residues from Thermal Process in a Medium-Sized Urban System in Northern Italy

Stabilized biomass ash as a sustainable substitute for commercial P‐fertilizers

Case Study of Raw Materials Substitution: Natural Fillers Substitution in Plastic Composites

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