Asbestos treatment technologies

Paolini, Valerio; Tomassetti, Laura; Segreto, Marco; Borin, Daniele; Liotta, Flavia; Torre, Marco; Petracchini, Francesco

doi:10.1007/s10163-018-0793-7

Cited by 52 publications

(37 citation statements)

References 38 publications

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“…In fact, five fibrous amphiboles [actinolite, "amosite" (fibrous variety of grunerite), anthophyllite, "crocidolite" (fibrous variety of riebeckite) and tremolite], plus the fibrous serpentine mineral chrysotile, are grouped under the commercial term of asbestos. Thermally induced inertisation is considered as the most promising approach for asbestos containing materials (ACMs) (Paolini et al, 2019), and this process has been recently proposed by the European Parliament as a preferable way to landfilling (European Parliament resolution of March 14, 2013). For a safe use of the products of thermal treatments of ACMs it is of obvious interest the detailed knowledge of the structural modification occurring in asbestos during heating as well as its correlation with their surface reactivity (Pacella et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Towards a detailed comprehension of the inertisation processes of amphibole asbestos:in situhigh-temperature behaviour of fibrous tremolite

Ballirano

Pacella

2020

MinMag

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Thermal behaviour of fibrous tremolite from Maryland, USA has been investigated in situ up to breakdown temperature. Tremolite can be found both as primary constituent and as contaminant in Asbestos Containing Materials (ACMs). The products of breakdown are subcalcic diopside and calcium-rich clinoenstatite in a 2:1 ratio, traces of hematite plus minor silica-rich amorphous material. Thermal expansion follows a regular trend up to 723 K before the onset of Fe2+ oxidation/OH– deprotonation which is completed at 1023 K. At 923 K the Fe3+ migration starts towards M(1) and the corresponding counter-migration of Mg to M(2) and M(3). At T close to structure breakdown, M(2) shows a significant site-scattering reduction possibly consistent with the occurrence of minor vacancies. In fully oxidised tremolite, Fe3+ is allocated prevalently at M(1) and subordinately at M(3). As it is well-known that M(1), along with M(2), is the most exposed octahedral site at the surface of amphiboles, most of the Fe3+ is available for participating in the Fenton-like reactivity of oxidised tremolite, potentially making it dangerous for human health. This point should be properly taken into account in the evaluation of the safety of thermally decomposed tremolite-containing ACMs, in particular in the case of accidentally incomplete treatments.

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Section: Introductionmentioning

confidence: 99%

Towards a detailed comprehension of the inertisation processes of amphibole asbestos:in situhigh-temperature behaviour of fibrous tremolite

Ballirano

Pacella

2020

MinMag

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“…Indeed, the solidification immobilizes asbestos into inert material such as a cement matrix [32], resulting in a reduction of fiber release, the decrease of the exposed surface area and the reduction of both porosity and permeability of ACW. The asbestos stabilization is a process leading to the reduction of the fibers mobility through the addition of adjuvant [8,9]. The solidification and stabilization treatments can be used as pretreatment before landfill disposal.…”

Section: Asbestos Treatment Technologiesmentioning

confidence: 99%

“…Today, renovation or demolition of buildings generates tons of asbestos waste that needs to be managed and disposed of appropriately according to regulations. Asbestos containing waste (ACW) is generally bagged and deposited in a controlled landfill, while the toxicity or potential health and environmental risk of asbestos fibers remain [8,9]. During the last two decades, studies described various biological interactions with raw asbestos and few focused on ACW.…”

Section: Introductionmentioning

confidence: 99%

A Review of Asbestos Bioweathering by Siderophore-Producing Pseudomonas: A Potential Strategy of Bioremediation

David

Geoffroy

2020

Microorganisms

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Asbestos, silicate minerals present in soil and used for building constructions for many years, are highly toxic due primarily to the presence of high concentrations of the transition metal iron. Microbial weathering of asbestos occurs through various alteration mechanisms. Siderophores, complex agents specialized in metal chelation, are common mechanisms described in mineral alteration. Solubilized metals from the fiber can serve as micronutrients for telluric microorganisms. The review focuses on the bioweathering of asbestos fibers, found in soil or manufactured by humans with gypsum (asbestos flocking) or cement, by siderophore-producing Pseudomonas. A better understanding of the interactions between asbestos and bacteria will give a perspective of a detoxification process inhibiting asbestos toxicity.

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“…When the process is scaled up, the thermal and electric consumption will be lower. It can be assumed that the energy consumption of the proposed method has similar or even lower values than in other ACM thermal treatment processes (ranging from 0.5 to 1.5 kWh•kg −1 [48]), so it can be considered to be economically competitive. An analysis of the chemical composition (Table 2) and phase composition (Figure 3) indicates that the main phase in the product of melting of ACM with an addition of sodium carbonate and feldspar, is dicalcium silicate in the form of larnite crystals (β-Ca 2 SiO 4 ; ICDD-PDF 01-077-0388) and calcio-olivine (γ-Ca 2 SiO 4 ; ICDD-PDF 04-010-9508).…”

Section: Characterization Of the Melted Productmentioning

confidence: 99%

“…There are also reports of chemical [38][39][40][41][42][43] or mechanochemical methods [44,45]. Detailed information on various methods of dealing with asbestos waste is provided by review studies, which have appeared in recent years [46][47][48]. One of the proposed solutions is also a method of asbestos waste disposal by a melting process in a laboratory arc-resistance electric furnace.…”

Section: Introductionmentioning

confidence: 99%

Obtaining an Artificial Aggregate from Cement-Asbestos Waste by the Melting Technique in an Arc-Resistance Furnace

Witek

Psiuk

Naziemiec

et al. 2019

Fibers

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Nowadays, asbestos waste still remains a serious problem. Due to the carcinogenic properties of asbestos, which are related to its fibrous structure, the exposure to asbestos mineral and asbestos-containing materials (ACM) causes dangerous health effects. This problem can be solved by recycling techniques, which allow the re-use of neutralized asbestos waste, instead of disposing it in special landfills. The article presents the results of research aimed at investigating the possibility of obtaining aggregates from asbestos waste by the fusion process in the electric arc-resistance process. A mixture of ACM with selected fluxes was were melted and then cast to form a grain of aggregates. The chemical composition of the material was determined before and after the melting process. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were applied to evaluate the effects of the fusion process. The main properties of the obtained aggregate were also measured. The results confirmed that the fibrous structure of asbestos was destroyed in the obtained material, which can be successfully used for the production of artificial aggregates.

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Asbestos treatment technologies

Cited by 52 publications

References 38 publications

Towards a detailed comprehension of the inertisation processes of amphibole asbestos:in situhigh-temperature behaviour of fibrous tremolite

Towards a detailed comprehension of the inertisation processes of amphibole asbestos:in situhigh-temperature behaviour of fibrous tremolite

A Review of Asbestos Bioweathering by Siderophore-Producing Pseudomonas: A Potential Strategy of Bioremediation

Obtaining an Artificial Aggregate from Cement-Asbestos Waste by the Melting Technique in an Arc-Resistance Furnace

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