Carbon dioxide utilization with carbonation using industrial waste-desulfurization gypsum and waste concrete

Lee, Min Gu; Kang, Dongwoo; Jo, Hoyong; Park, Jin-Won

doi:10.1007/s10163-015-0461-0

Cited by 26 publications

(17 citation statements)

References 15 publications

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“…What is more, it has been observed that the use of waste materials as pozzolanic in high-strength concrete improves its strength and durability. This alternately helps minimize the impending environmental degradation [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Compressive Strength of Fly Ash Based Concrete Using Individual and Ensemble Algorithm

et al. 2021

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Machine learning techniques are widely used algorithms for predicting the mechanical properties of concrete. This study is based on the comparison of algorithms between individuals and ensemble approaches, such as bagging. Optimization for bagging is done by making 20 sub-models to depict the accurate one. Variables like cement content, fine and coarse aggregate, water, binder-to-water ratio, fly-ash, and superplasticizer are used for modeling. Model performance is evaluated by various statistical indicators like mean absolute error (MAE), mean square error (MSE), and root mean square error (RMSE). Individual algorithms show a moderate bias result. However, the ensemble model gives a better result with R2 = 0.911 compared to the decision tree (DT) and gene expression programming (GEP). K-fold cross-validation confirms the model’s accuracy and is done by R2, MAE, MSE, and RMSE. Statistical checks reveal that the decision tree with ensemble provides 25%, 121%, and 49% enhancement for errors like MAE, MSE, and RMSE between the target and outcome response.

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Section: Introductionmentioning

confidence: 99%

Prediction of Compressive Strength of Fly Ash Based Concrete Using Individual and Ensemble Algorithm

et al. 2021

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“…At a higher rate of CO 2 gas injection, spherical vaterite formed within the shortened reaction time (Figures 8 and 9). In contrast, a longer application of the carbon mineralization process, with a lower gas flow rate, resulted in the vaterite transforming to more stable calcite crystals by reacting with water in the aqueous phase under atmospheric pressure conditions [18,39].…”

Section: Co 2 Sequestrationmentioning

confidence: 99%

“…In addition, CaCO3 by-products produced by this process can be used in other industries for cement production, paper filling/coating additives and plastic/paint manufacturing according to purity and varying particle sizes [18,19]. Numerous studies have been undertaken recently on the carbon mineralization processes using Ca-rich alkaline solution from various sources, focusing on the production and characterization of CaCO3 particles (e.g., rhombic calcite, orthorhombic aragonite, spherical vaterite; µ-CaCO3) [15,[20][21][22][23].…”

Section: Co2(g) → Co2(aq)mentioning

confidence: 99%

“…Metals 2017, 7, 371 9 of 13 more stable calcite crystals by reacting with water in the aqueous phase under atmospheric pressure conditions [18,39]. The increase in CO2 gas flow rate may have a positive effect on operating time and power consumption for the field-scale neutralization of alkaline wastewater.…”

Section: Co 2 Sequestrationmentioning

confidence: 99%

“…This study focused on the feasibility of neutralizing and re-using wastewater generated from concrete sludge without using acids; a detailed field-scale investigation is required to understand the overall economy of the process. Metals 2017, 7, 371 9 of 13 more stable calcite crystals by reacting with water in the aqueous phase under atmospheric pressure conditions [18,39]. The increase in CO2 gas flow rate may have a positive effect on operating time and power consumption for the field-scale neutralization of alkaline wastewater.…”

Section: Co 2 Sequestrationmentioning

confidence: 99%

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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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Chemical conversion of carbon dioxide via target metal separation using seawater‐derived wastewater

et al. 2018

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This study investigated the capture of carbon dioxide (CO 2 ) and its chemical conversion to high-purity calcium carbonate salt, which has potential uses in a range of industrial sectors. Indirect inorganic aqueous carbonation methods were used, with seawater-based industrial wastewater as the source of metal ions. The alkanolamine absorbent solutions of monoethanolamine (MEA), diethanolamine (DEA), and methyldiethanolamine (MDEA) were used at typical industrial concentrations of 30 wt%. Calcium ions from industrial wastewater were extracted in the form of gypsum. Subsequently, a carbonation reaction afforded high-purity calcium carbonate salt. The conversion yields of 33.16% for monoethanolamine, 33.86% for diethanolamine, and 55.18% for methyldiethanolamine were achieved. Thermogravimetric analysis demonstrated the purity of the product to be 93.6, 95.2 and 92.8 wt%, respectively. Xray diffraction and scanning electron microscopy showed the crystal structure of the products to be aragonite mixed with vaterite. Furthermore, the CO 2 capture capacity of each absorbent and the amount of CO 2 desorbed by the carbonation reaction were investigated. The results may support the design of carbon capture and utilization plants and potential market research.

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Carbon dioxide utilization with carbonation using industrial waste-desulfurization gypsum and waste concrete

Cited by 26 publications

References 15 publications

Prediction of Compressive Strength of Fly Ash Based Concrete Using Individual and Ensemble Algorithm

Prediction of Compressive Strength of Fly Ash Based Concrete Using Individual and Ensemble Algorithm

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

Chemical conversion of carbon dioxide via target metal separation using seawater‐derived wastewater

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