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Updated: May 13, 2025

Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.
Published on: June 4, 2021
Sustainable CO2 utilization and calcium carbonate recovery from calcium carbide wastewater
Kamchai Nuithitikul1, Peerapong Jitsangiam2,3, Pumipat K Pachana4,5
1Biomass and Oil Palm Center of Excellence, School of Engineering and Technology, Walailak University, Nakhon Si Thammarat 80160, Thailand.
Abstract:
The hydration of calcium carbide for acetylene production generates calcium carbide residue (CCR), primarily as a calcium hydroxide slurry, often disposed of in ponds, increasing soil alkalinity and CCR wastewater. This study, thus, explores converting CCR wastewater into calcium carbonate (CaCO3) via CO2 carbonation with triethanolamine (TEA). After initial carbonation and filtration, the carbonated CCR solutions were heated to 80°C to remove CO2 and the solution underwent three cycles of dissolution and carbonation, promoting resource sustainability. TEA enhanced cubic calcite formation, but only non-TEA solutions successfully precipitated CaCO3 upon reuse. Successive recycling rounds reduced CCR dissolution and CaCO3 formation due to impurity buildup. Maximum CaCO3 yields were 23.0% for heated solution and 36.6% for non-heated solution. To enhance process sustainability, dilution with raw water is recommended to counter impurity accumulation and optimize recycling conditions.
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