Investigating carbonate formation in urban soils as a method for capture and storage of atmospheric carbon.
Investigating carbonate formation in urban soils as a method for capture and storage of atmospheric carbon.
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DOI：
10.1016/j.scitotenv.2012.05.037
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发表时间：
2012-08
期刊：
影响因子：
--
通讯作者：
C. Washbourne;P. Renforth;D. A. C. Manning
中科院分区：
文献类型：
--
作者：
C. Washbourne;P. Renforth;D. A. C. Manning
本文研究了城市工程土壤捕获和储存大气碳(C)的潜力。土壤环境中含钙(Ca)和镁(Mg)的废硅酸盐矿物可通过风化和次生碳酸盐矿物沉淀过程捕获和储存大气C。在位于英国泰恩河畔纽卡斯尔市中心的一块10公顷的棕地上，对已知含有大量来自拆除活动的富钙和富镁矿物(特别是水泥和混凝土)的人为土壤进行了系统的地表采样。随后的分析得出平均碳酸盐含量为21.8±4.7%(Wt CaCO3)。同位素分析表明，δ18O值介于−9.4‰和−13.3‰之间，δ13C值介于−7.4‰和−13.6‰之间(相对于Pee Dee贝伦石)，表明高pH溶液中溶解的CO2通过羟化作用从大气中捕获了39.4±8.8%的碳酸盐碳。剩余的碳酸盐C来源于成岩来源。整个场地每毫克土壤已经捕获和储存了37.4公斤的大气二氧化碳，相当于12.5kgCO2 MG−1yr−1的二氧化碳脱除率。在剩余的反应材料中，还有可能捕获和储存27.3kgCO2 MG−1，这可以通过增加停留时间(额外的就地风化)来利用。总体而言，科学中心遗址具有捕获和储存总计64,800 mg二氧化碳作为碳酸盐矿物的潜力。这项研究阐明了城市土壤作为一种重要的生态系统服务--碳捕获和储存工具的潜力，并论证了在工程城市人为土壤中研究碳储存的重要性。
This paper investigates the potential for engineered urban soils to capture and store atmospheric carbon (C). Calcium (Ca) and magnesium (Mg) bearing waste silicate minerals within the soil environment can capture and store atmospheric C through the process of weathering and secondary carbonate mineral precipitation. Anthropogenic soils, known to contain substantial quantities of Ca and Mg-rich minerals derived from demolition activity (particularly cement and concrete), were systematically sampled at the surface across a 10ha brownfield site, Science Central, located in the urban centre of Newcastle upon Tyne, U.K. Subsequent analysis yielded average carbonate contents of 21.8±4.7% wt CaCO3. Isotopic analysis demonstrated δ18O values between −9.4‰ and −13.3‰ and δ13C values between −7.4‰ and −13.6‰ (relative to Pee Dee Belemnite), suggesting that up to 39.4±8.8% of the carbonate C has been captured from the atmosphere through hydroxylation of dissolved CO2in high pH solutions. The remaining carbonate C is derived from lithogenic sources. 37.4kg of atmospheric CO2has already been captured and stored as carbonate per Mg of soil across the site, representing a carbon dioxide (CO2) removal rate of 12.5kgCO2Mg−1yr−1. There is the potential for capture and storage of a further 27.3kgCO2Mg−1in residual reactive materials, which may be exploited through increased residence time (additional in situ weathering). Overall, the Science Central site has the potential to capture and store a total of 64,800Mg CO2as carbonate minerals. This study illustrates the potential for managing urban soils as tools of C capture and storage, an important ecosystem service, and demonstrates the importance of studying C storage in engineering urban anthropogenic soils.