scholarly journals Fundamental Studies on CO2 Sequestration of Concrete Slurry Water Using Supercritical CO2

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 94
Author(s):  
Sang-Rak Sim ◽  
Dong-Woo Ryu
Keyword(s):  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Supercritical Co2 ◽  
Cement Industry ◽  
Reaction Products ◽  
Carbon Utilization ◽  
Gas Emissions ◽  
Industrial Sectors ◽  
Concrete Production ◽  
Solids Content

To prevent drastic climate change due to global warming, it is necessary to transition to a carbon-neutral society by reducing greenhouse gas emissions in all industrial sectors. This study aims to prepare measures to reduce the greenhouse gas in the cement industry, which is a large source of greenhouse gas emissions. The research uses supercritical CO2 carbonation to develop a carbon utilization fixation technology that uses concrete slurry water generated via concrete production as a new CO2 fixation source. Experiments were conducted using this concrete slurry water and supernatant water under different conditions of temperature (40 and 80 °C), pressure (100 and 150 bar), and reaction time (10 and 30 min). The results showed that reaction for 10 min was sufficient for complete carbonation at a sludge solids content of 5%. However, reaction products of supernatant water could not be identified due to the presence of Ca(HCO3)2 as an aqueous solution, warranting further research.

Effective reduction plan for greenhouse gas inventories of local governments

2020 ◽  
pp. 0958305X2090708
Author(s):  
Eun-Mi Been ◽  
Young-Kwon Park ◽  
Kyung-Tae Kim
Keyword(s):  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Local Governments ◽  
Industrial Sector ◽  
National Government ◽  
Road Transportation ◽  
Gas Emissions ◽  
Greenhouse Gas Inventories ◽  
Greenhouse Gas Reduction ◽  
Industrial Sectors

The main purpose of this study is to propose a reduction of inventory based on non-industrial sectors reflecting the characteristics of local governments and efficient greenhouse gas reduction activities in Korea. Although national government has implemented various policies and systems to reduce greenhouse gas emissions, it would only remain in industrial and public areas. Thus, in order to reduce national greenhouse gas emissions, local governments should play a major role as a leading management entity and it is necessary to adopt efficient and systematic management of the non-industrial sector, which accounted for a significant portion of the country’s emissions. However, the policy of the local governments to reduce greenhouse gas emissions has not been effective due to lacking in connectivity to the central government’s plan or presenting it in a simple listing format. The characteristics of inventory building such as main purpose, boundary setting, emission source, policy setting, range, organizing body, relevant law of inventory building between national government, and local governments are quite different from the start. In order to reflect the actual greenhouse gas reduction activities of the local governments, this study reconstructs the categories that are considered to have management authority in the local governments such as home, commercial, and road transportation among the scope 1 of the local governments inventory and scope 2 for establishing effective policies to reduce greenhouse gas emissions in local governments. This study also proposes reduced inventory by reorganizing categories that local governments deem to have managerial authority among direct and indirect emission of greenhouse gas inventory.

scholarly journals Models of Environmental Impact Assessment of Emerging Technologies from Chemical and Cement Industry

Proceedings ◽  
2019 ◽  
Vol 29 (1) ◽  
pp. 51
Author(s):  
Radu Claudiu Fierascu ◽  
Irina Fierascu ◽  
Adriana Moanta
Keyword(s):  
Environmental Impact ◽  
Impact Assessment ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Environmental Impact Assessment ◽  
Emerging Technologies ◽  
Cement Industry ◽  
Gas Emissions

Industry is a major source of global greenhouse gas emissions. [...]

scholarly journals Mechanical Properties and Microstructure of Low Carbon Binders Manufactured from Calcined Canal Sediments and Ground Granulated Blast Furnace Slag (GGBS)

2021 ◽  
Vol 13 (16) ◽  
pp. 9057
Author(s):  
Rachid Hadj Sadok ◽  
Walid Maherzi ◽  
Mahfoud Benzerzour ◽  
Richard Lord ◽  
Keith Torrance ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Linear Increase ◽  
High Reactivity ◽  
Cement Industry ◽  
Partial Substitution ◽  
Low Carbon ◽  
Gas Emissions ◽  
Pozzolanic Material

This research study evaluated the effects of adding Scottish canal sediment after calcination at 750 °C in combination with GGBS on hydration, strength and microstructural properties in ternary cement mixtures in order to reduce their carbon footprint (CO2) and cost. A series of physico-chemical, hydration heat, mechanic performance, mercury porosity and microstructure tests or observations was performed in order to evaluate the fresh and hardened properties. The physical and chemical characterisation of the calcined sediments revealed good pozzolanic properties that could be valorised as a potential co-product in the cement industry. The results obtained for mortars with various percentages of calcined sediment confirmed that this represents a previously unrecognised potential source of high reactivity pozzolanic materials. The evolution of the compressive strength for the different types of mortars based on the partial substitution of cement by slag and calcined sediments showed a linear increase in compressive strength for 90 days. The best compressive strengths and porosity were observed in mortars composed of 50% cement, 40% slag and 10% calcined sediment (CSS10%) after 90 days. In conclusion, the addition of calcined canal sediments as an artificial pozzolanic material could improve strength and save significant amounts of energy or greenhouse gas emissions, while potentially contributing to Scotland’s ambitious 2045 net zero target and reducing greenhouse gas emissions by 2050 in the UK and Europe.

New projection of GHG reduction potentials for Korea’s cement industry and comparison with Roadmap 2030

2018 ◽  
Vol 30 (3) ◽  
pp. 499-521
Author(s):  
Nayeah Kim ◽  
Yun Seop Hwang ◽  
Mun Ho Hwang
Keyword(s):  
Power Generation ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Cement Industry ◽  
Raw Material ◽  
Gas Emissions ◽  
Material Substitution

The purpose of this study is to forecast the greenhouse gas reduction potential of Korea’s cement industry by applying the latest data and new reduction methods and compare them with the previously imposed reduction target, 7.1% of Roadmap 2030. The greenhouse gas emissions are estimated on two different parts of fuel combustion and industrial process emissions, and the Reference Energy System is formed based on the cement production processes in 2015. Estimated clinker productions and energy consumptions are applied to develop the BAU scenario, and the MESSAGE model is used for the reduction scenario analysis. The reduction scenarios include raw material substitution, fuel substitution, and waste heat recovery power generation. Greenhouse gas emissions of 33,775 thousand tCO2e are estimated in the BAU scenario and greenhouse gas emissions after reduction are forecasted to be 31,626 thousand tCO2e, decreased 6.4% compared to the BAU scenario. The reduction rates are expected to be 5.3% in raw material substitution, 2.9% in waste heat recovery power generation, 0.7% in fuel substitution, and 0.1% in equipment energy efficiency. Thus, we propose that raw material substitution and waste heat recovery power generation are actively utilized, to review the existing greenhouse gas reduction method and develop the new technologies and to build a cooperation system between government and industry based on mutual trust.

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