Optimal sequestration of carbon dioxide and phosphorus in soils by gypsum amendment
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- 作者：Huiying Zhang ; Ruiqiang Liu ; Rattan Lal
- 关键词：Gypsum ; Flue gas desulfurization (FGD) gypsum ; Phosphorus ; Carbon dioxide ; Modeling ; Agriculture
- 刊名：Environmental Chemistry Letters
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：14
- 期：4
- 页码：443-448
- 全文大小：399 KB
- 刊物类别：Earth and Environmental Science
- 刊物主题：Earth sciences
Geochemistry
Analytical Chemistry
Biochemistry
Monitoring, Environmental Analysis and Environmental Ecotoxicology
Soil Science and Conservation
Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution - 出版者：Springer Berlin / Heidelberg
- ISSN：1610-3661
- 卷排序：14
文摘
Gypsum has been applied as a natural fertilizer and soil amendment for centuries in agriculture for providing crop nutrients such as Ca and S, and for improving soil physical properties. Recently, gypsum has been tested for sequestrating CO2 from the air and for capturing soluble phosphates in the soil, through formation of insoluble calcium phosphates and carbonates. However, the environmental factors controlling these sequestration processes have not been systemically studied. Here, we calculate optimal conditions of sequestration using chemical equilibrium modeling. Our results show that CO2 carbonation is effective at pH higher than 8.5 at atmospheric concentration. The removal of P is higher than 80 % for pH higher than 6.4, when Ca and P are at stoichiometric ratio. Also, placement of gypsum in subsoil is more effective for CO2 capture than applying it on soil surface since soil pores often contain higher concentrations of CO2 due to the soil respiration process. Overall, increases in medium pH, gypsum application rate, or CO2 partial pressure can increase the effectiveness of the amendment.