Carbonation of MSWI-bottom ash to decrease heavy metal leaching, in view of recycling

Gerven, Tom Van; Keer, E. Van; Arickx, S.; Jaspers, Mariet; Wauters, Guido; Vandecasteele, Carlo

doi:10.1016/j.wasman.2004.07.008

Cited by 193 publications

(122 citation statements)

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“…In addition to this, BA tends to undergo expansive and swelling reactions that are related to the presence of metallic aluminum or aluminum compounds (Müller and Rübner 2006). In order to reduce the secondary environmental pollution, some treatments have been proposed to reduce detrimental reactions (Gerven et al 2005;Ferraris et al 2009;Pera et al 1997;Cheeseman et al 2005;Chang et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Optimal Use of MSWI Bottom Ash in Concrete

Zhang

Zhao

2014

Int J Concr Struct Mater

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An experimental investigation was carried out to evaluate the mechanical properties of concrete mixtures in which coarse aggregate was partially (30, 50 or 70 %) replaced with pre-washed municipal solid waste incineration (MSWI) bottom ash. Results indicated that bottom ash reduced the compressive strength, elastic modulus, and levels of heavy metals in leachate when used as a replacement for gravel, and that the maximum amount of MSWI bottom ash in concrete should not exceed 50 %. To analyze the effect mechanism of bottom ash in concrete, the degree of hydration and the following pozzolanic reaction characterized by the pozzolanic activity index, and the porosity distribution in cement mortar. The study indicates that improved properties of concrete are not solely later strength gain and reduced levels of heavy metals in leachate but also the progression of pozzolanic reactions, where a dense structure contains a higher proportion of fine pores that are related to durability.

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Section: Introductionmentioning

confidence: 99%

Optimal Use of MSWI Bottom Ash in Concrete

Zhang

Zhao

2014

Int J Concr Struct Mater

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“…Primary constituents of the ashes are oxides of Si (SiO 2 ), Al (Al 2 O 3 ), Fe (Fe 2 O 3 ), Ca (CaO), Mg (MgO), Na (Na 2 O), K (K 2 O), and Ti (TiO 2 ) [6][7][8]. Ashes also contain significant amounts of elements with toxic characters such as As, Ba, Cd, Cu, Co, Cr, Ni, Pb, V, and Zn [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

An ultrasound-assisted digestion method for the determination of toxic element concentrations in ash samples by inductively coupled plasma optical emission spectrometry

Ilander¹,

Väisänen²

2007

Analytica Chimica Acta

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A method of ultrasound-assisted digestion followed by inductively coupled plasma optical emission spectrometry (ICP-OES) used for the determination of toxic element concentrations (arsenic, barium, cobalt, copper, lead, nickel, strontium, vanadium and zinc) in ash samples was developed. All the measurements were performed in robust plasma conditions which were tested by measuring the Mg II 280.270 nm / Mg I 285.213 nm line intensity ratios. The highest line intensity ratios were observed when a nebulizer gas flow of 0.6 L min -1 , auxiliary gas flow of 0.2 L min -1 and plasma power of 1400 W were used for radially viewed plasma.The analysis of SRM 1633b showed that the ultrasound-assisted method developed is highly comparable with the microwave digestion method standardized by the United States Environmental Protection Agency (EPA-3052). The ultrasound-assisted digestion with a digestion solution of aqua regia and hydro fluoric acid (HF) resulted in recovery rates of over 81 %. One exception is arsenic which resulted in recoveries of about 60 % only; however, it could be digested with good recovery (> 90 %) using a digestion solution of 5 mL of water and 5 mL of aqua regia. The major advantage of the ultrasound-assisted digestion over microwave digestion is the high treatment rate (30 samples simultaneously with a sonication time of 18 min).

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“…As these materials are often associated with CO 2 point source emissions and tend to be chemically more unstable than geologically derived minerals [9], they require a lower degree of pre-treatment and less energy-intensive operating conditions to enhance carbonation yields [9,10]. Furthermore, after stabilization by accelerated carbonation, the leaching behavior of alkaline waste materials such as municipal solid waste incinerator (MSWI) bottom ash [11,12], steel slag [4,9,13,14], air pollution control (APC) residues [15,16] and ashes from coal and oil shale power plants [17][18][19] is improved. This allows the usage of stabilized waste materials in civil engineering applications or for safer final disposal to landfill.…”

mentioning

confidence: 99%

MINERAL TRAPPING OF CO₂VIA OIL SHALE ASH AQUEOUS CARBONATION: CONTROLLING MECHANISM OF PROCESS RATE AND DEVELOPMENT OF CONTINUOUS-FLOW REACTOR SYSTEM

Uibu¹,

Kuusik²

2009

Oil Shale

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Ash containing considerable amounts of free lime as the most active component requires stabilization to assure safe landfilling. Using CO 2 from flue gases as a neutralizing agent, also the emission of CO 2 is diminished. The most extensive effect could be achieved by treating ash-water suspensions with CO 2 -containing gas. As even minute amounts of extraneous substances present in water influence the extent and rate of lime solubility in water, the behavior of lime as the key component of ash in various conditionswas studied and the mechanism of process deceleration was proposed. As the next step, a laboratory-scale continuous-flow reactor system for aqueous carbonation of oil shale ash and main considerations for industrial pilotscale plant design were developed. IntroductionEmission of greenhouse gases and safe deposition/utilization of solid wastes are among the most serious problems caused by extensive usage of lowgrade solid fuels in the world heat and power production. CO 2 emissions could be decreased by reducing the usage of fossil energy sources, improving energy efficiency and/or by more intensive implementation of carbon capture and storage (CCS) technologies. CO 2 sequestration by mineral carbonation, considering both natural minerals [1,2] and alkali wastes [3][4][5] as CO 2 sorbents, is a prospective option.Carbonation of minerals is similar to natural rock weathering and involves permanent storage of CO 2 under the thermodynamically stable form of calcium and magnesium carbonates [6]. Mg-and Ca-rich silicates such as olivine, serpentine, talc and wollastonite are available worldwide and have * Corresponding author: e-mail maiuibu@staff.ttu.ee Mineral Trapping of CO2 via Oil Shale Ash Aqueous Carbonation 41the potential of sequestrating the total amount of CO 2 emitted from the combustion of all the available fossil fuel reservoirs [7]. Unfortunately, because of very slow reaction rates the carbonation of natural minerals requires chemical additives and/or elevated pressures and temperatures [8].One way of bypassing some draw-backs of accelerated carbonation of primary alkaline earth minerals is using alkaline waste residues from thermal processes or from construction and demolition activities as a feedstock. As these materials are often associated with CO 2 point source emissions and tend to be chemically more unstable than geologically derived minerals [9], they require a lower degree of pre-treatment and less energy-intensive operating conditions to enhance carbonation yields [9,10]. Furthermore, after stabilization by accelerated carbonation, the leaching behavior of alkaline waste materials such as municipal solid waste incinerator (MSWI) bottom ash [11,12], steel slag [4,9,13,14], air pollution control (APC) residues [15,16] and ashes from coal and oil shale power plants [17][18][19] is improved. This allows the usage of stabilized waste materials in civil engineering applications or for safer final disposal to landfill.The energy sector of the Republic of Estonia is predominantly (up to 67...

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Carbonation of MSWI-bottom ash to decrease heavy metal leaching, in view of recycling

Cited by 193 publications

References 6 publications

Optimal Use of MSWI Bottom Ash in Concrete

Optimal Use of MSWI Bottom Ash in Concrete

An ultrasound-assisted digestion method for the determination of toxic element concentrations in ash samples by inductively coupled plasma optical emission spectrometry

MINERAL TRAPPING OF CO₂VIA OIL SHALE ASH AQUEOUS CARBONATION: CONTROLLING MECHANISM OF PROCESS RATE AND DEVELOPMENT OF CONTINUOUS-FLOW REACTOR SYSTEM

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Carbonation of MSWI-bottom ash to decrease heavy metal leaching, in view of recycling

Cited by 193 publications

References 6 publications

Optimal Use of MSWI Bottom Ash in Concrete

Optimal Use of MSWI Bottom Ash in Concrete

An ultrasound-assisted digestion method for the determination of toxic element concentrations in ash samples by inductively coupled plasma optical emission spectrometry

MINERAL TRAPPING OF CO2VIA OIL SHALE ASH AQUEOUS CARBONATION: CONTROLLING MECHANISM OF PROCESS RATE AND DEVELOPMENT OF CONTINUOUS-FLOW REACTOR SYSTEM

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MINERAL TRAPPING OF CO₂VIA OIL SHALE ASH AQUEOUS CARBONATION: CONTROLLING MECHANISM OF PROCESS RATE AND DEVELOPMENT OF CONTINUOUS-FLOW REACTOR SYSTEM