Accelerated carbonation treatment of industrial wastes

Gunning, Peter; Hills, Colin D.; Carey, Paula

doi:10.1016/j.wasman.2010.01.005

Cited by 177 publications

(111 citation statements)

References 53 publications

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“…The above mentioned ashes are the result of the co-combustion of forest biomass (80%) and agricultural waste (20%) with hard coal in a conventional pulverized boiler For the analyzed fly ashes resulting from the co-firing of biomass, the mentioned maximum theoretical carbon dioxide binding capacity is 8.03%, which is a relatively low result compared to the maximum capacity calculated for fly ash from hard coal combustion -24.6% (Mazzella et al 2016); fly ash from biomass combustion -around 38% (Gunning et al 2010); fly ash from lignite combustion (Uliasz-Bocheńczyk 2009), or the mixture of fly ash and desulphurization products.…”

Section: The Materials Used For Testingmentioning

confidence: 80%

The mineral sequestration of CO2 with the use of fly ash from the co-combustion of coal and biomass

Uliasz-Bocheńczyk¹,

Pawluk²,

Pyzalski³

2017

Gospodarka Surowcami Mineralnymi

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Summary As a result of energy production processes, the power industry is the largest source of CO2 emissions in Poland. Emissions from the energy sector accounted for 52.37% (162 689.57 kt) of the total emissions in 2015, which was estimated at 310.64 million tons of CO2. In recent years, the tightening of regulations on the use of renewable energy sources has resulted in an increased amount of biomass used in the professional energy industry. This is due to the fact that the CO2 emissions from biomass combustion are not included in the total emissions from the combustion of fuels, resulting in the zero- emission factor for biomass. At the same time, according to the hierarchy of waste management methods, recycling is the preferred option for the management of by-products generated during energy production. The fly ashes resulting from the biomass combustion in pulverized boilers (which, due to their chemical composition, can be classified as silicate ash) were subjected to analysis. These ashes can be classified as waste 10 01 17 - fly ash from co-firing other than mentioned in 10 01 16 according to the Regulation of the Minister of the Environment of December 9, 2014 on waste catalogues. The maximum theoretical carbon dioxide binding capacity for the analyzed fly ashes resulting from the co-combustion of biomass is 8.03%. The phase composition analysis of the fly ashes subjected to carbonation process has shown, in addition to the components identified in pure fly ash samples (SiO2, mullite), the presence of calcium carbonate − calcite − the primary product of the carbonation process, as indicated by the results of both X-ray and thermogravimetric analysis.The degree of carbonation has been determined based on the analysis of the results of the phase composition of fly ash resulting from the co-firing of biomass and bituminous coal. The calculated degree of carbonation amounted to 1.51%. The carbonation process is also confirmed by the lowered pH of the water extracts, decreasing from 11.96 for pure ashes to 8.7 for CO2 treated fly ashes. In addition, the carbonation process has reduced the leaching of pollutants, most notably chlorides, sulphates, and potassium.

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Section: The Materials Used For Testingmentioning

confidence: 80%

The mineral sequestration of CO2 with the use of fly ash from the co-combustion of coal and biomass

Uliasz-Bocheńczyk¹,

Pawluk²,

Pyzalski³

2017

Gospodarka Surowcami Mineralnymi

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“…e microcracks were generated in the carbonated areas, which decreased the strength of concrete [21]. Gunning et al demonstrated that accelerated carbonation could enhance the curing property of cement solidification and reduce the cost of disposal processes [22]. Although many studies investigated the carbonation reaction, its effects on the strength of contaminated soil that is solidified by cement still have not been systematically studied.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Carbonation Effects on Cement‐Solidified Contaminated Soil Used in Road Subgrade

Zhou

Pan

Tang

et al. 2018

Advances in Materials Science and Engineering

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Cement solidification/stabilization is widely used towards contaminated soil since it has a low price and significant improvement for the structural capacity of soil. To increase the usage of the solidified matrix, cement-solidified contaminated soil was used as road subgrade material. In this study, carbonation effect that reflected the durability on strength characteristics of cementsolidified contaminated soil and the settlement of pavement were evaluated through experimental and numerical analysis, respectively. According to results, compressive strengths of specimens with 1% Pb(II) under carbonation and standard curing range from 0.44 MPa to 1.17 MPa and 0.14 MPa to 2.67 MPa, respectively. e relatively low strengths were attributed to immobilization of heavy metal, which consumed part of SiO 2 , Al 2 O 3 , and CaO components in the cement or kaolin and reduced the hydration and pozzolanic reaction materials. is phenomenon further decreased the strength of solidified soils. e carbonation depth of 1% Cu(II) or Zn(II) contaminated soils was 18 mm, which significantly increased with the increase of curing time and contamination concentration. Furthermore, the finite element calculation results showed that surface settlements decreased with the increase of modulus of subgrade and the distance away from the center. At the center, the pavement settlement was proportional to the level of traffic load.

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“…In addition, it is also a CO2 sequestration technique to reduce CO2 atmospheric levels through the consumption of flue gas [10]. It also neutralizes alkaline solutions [8,11,12] and results in the production of useful carbonate-based minerals such as calcium carbonate (CaCO3). The carbon mineralization process in a Ca-rich solution occurs according to the following Reactions (1)-(4) [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

An Eco-Friendly Neutralization Process by Carbon Mineralization for Ca-Rich Alkaline Wastewater Generated from Concrete Sludge

Yoo

Shin

2017

Metals

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Waste-concrete recycling processes using wet-based crushing methods inevitably generate a large amount of alkaline concrete sludge, as well as wastewater, which contains abundant Ca ions. The Ca-rich alkaline wastewater must then be neutralized for reuse in the waste-concrete recycling process. In this study, the feasibility of a carbon mineralization process for the neutralization of alkaline wastewater was considered from both environmental and economic perspectives. The optimal reaction time, efficiency of Ca removal and CO 2 sequestration as a function of the CO 2 gas flow rate were assessed. The carbon mineralization process resulted in sequestering CO 2 (85-100% efficiency) and removing Ca from the solution (84-99%) by precipitating pure CaCO 3 . Increasing the gas flow rate reduced the reaction time (65.0 down to 3.4 min for 2.5 L of solution), but decreased CO 2 sequestration (from 463.3 down to 7.3 mg CO 2 for 2.5 L of solution). Optimization of the gas flow rate is essential for efficient CO 2 sequestration, Ca removal, CaCO 3 production and, therefore, successful wastewater neutralization following the wet-based crushing process. The method presented here is an eco-friendly and economically viable substitute for dealing with alkaline wastewater. It may also provide a practical guide for the design of carbon mineralization processes for the neutralization of alkaline solutions containing large amounts of Ca.

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Accelerated carbonation treatment of industrial wastes

Cited by 177 publications

References 53 publications

The mineral sequestration of CO2 with the use of fly ash from the co-combustion of coal and biomass

The mineral sequestration of CO2 with the use of fly ash from the co-combustion of coal and biomass

Evaluation of Carbonation Effects on Cement‐Solidified Contaminated Soil Used in Road Subgrade

An Eco-Friendly Neutralization Process by Carbon Mineralization for Ca-Rich Alkaline Wastewater Generated from Concrete Sludge

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