Deployment of Accelerated Carbonation Using Alkaline Solid Wastes for Carbon Mineralization and Utilization Toward a Circular Economy

Abstract

This study suggests that the waste-to-resource supply chain can offer an approach to address simultaneously the issues of waste management and CO2 emissions toward a circular economy. Alkaline solid wastes can be used to mineralize CO2 through an accelerated carbonation reaction, especially if the wastes are generated near the point source of CO2, to achieve environmental and economic benefits. To enhance the performance of accelerated carbonation, a high-gravity carbonation process using a rotating packed bed reactor was developed and deployed. Due to additional energy consumption in high-gravity carbonation, the environmental benefits and economic costs should be critically assessed from a life-cycle perspective. In this study, the resource potential of alkaline solid wastes in Taiwan was first determined for CO2 mineralization and utilization using the high-gravity carbonation process. Then, the performances of the process from engineering, environmental, and economic perspectives were evaluated and exemplified by a steelmaking plant. The results indicated that, with a CO2 removal ratio of 97–98%, the energy consumption of the high-gravity carbonation was estimated to be ∼345 kWh/t-CO2. From the perspective of environmental benefits, CO2 emission from the cement industry could be indirectly avoided by roughly one t-CO2-eq/t-slag due to the utilization of carbonated products.

Utilização da avaliação do ciclo de vida no contexto da economia circular: uma revisão de literatura

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“…No âmbito da eficiência energética e de recursos, Angelis-Dimakis et al (2016) avaliaram a eco-eficiência de oito sistemas de consumo de água e os resultados da ACV proporcionaram identificar os prontos críticos de cada sistema e, consequentemente, as oportunidades de melhoria para o uso mais eficiente do recurso. A eficiência de recursos foi comprovada por Pan et al (2017), os quais avaliaram os benefícios ambientais e econômicos através da aplicação da ACV e do CCV (Custeio do Ciclo de Vida), do aproveitamento do CO2 emitido pela indústria manufatureira de aço para tratamento dos resíduos alcalinos provenientes da indústria de aço para utilização no processo de produção de cimento. Daddi et al (2017) avaliaram o impacto positivo das ações de simbiose industrial em um cluster de curtumes na Itália, onde a aplicação da ACV quantificou os benefícios ambientais da produção de 1 m² de couro e reutilização de água do sistema clusterizado, colocando-a como ferramenta fundamental de apoio à decisão em iniciativas ligadas ao Desenvolvimento Sustentável.…”

Photo-Electrochemical Reduction of CO2 to Solar Fuel: A Review

“…[33]. However, emission rates are too high and there is still as need for new areas to store CO 2 such as feedstock to biofuel [34], carbonized cement materials [35], direct utilization of CO 2 via microalgae [34], CO 2 utilization in production of some special chemical products, energy products such as methanol, Dimethyl carbonate, Dimethyl ether etc. (see fig 1) [13,32].…”

Stabilization/Solidification of Zinc- and Lead-Contaminated Soil Using Limestone Calcined Clay Cement (LC3): An Environmentally Friendly Alternative

“…Furthermore, the production of 1 ton cement produces 0.82 ton CO 2 whereas 1 ton CC produces 0.175 ton CO 2 emissions. Therefore, replacing 50% OPC with CC and LS reduces the carbon footprint up to 40% [22][23][24], which makes the binder low-carbon/cost and also an environmentally friendly alternative material [24][25][26][27][28]. Although the influence of LC 3 is validated for Zn alone, its effectiveness and mechanism involved for the immobilization of Zn and Pb when they co-exist are unknown and need additional investigations.…”