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首页> 外文期刊>Environmental Science & Technology >Carbon Sequestration in Biogenic Magnesite and Other Magnesium Carbonate Minerals
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Carbon Sequestration in Biogenic Magnesite and Other Magnesium Carbonate Minerals

机译：生物镁矿和其他碳酸镁矿物质中的碳固存

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摘要

The stability and longevity of carbonate minerals make them an ideal sink for surplus atmospheric carbon dioxide. Biogenic magnesium carbonate mineral precipitation from the magnesium-rich tailings generated by many mining operations could offset net mining greenhouse gas emissions, while simultaneously giving value to mine waste products. In this investigation, cyanobacteria in a wetland bioreactor enabled the precipitation of magnesite (MgCO3), hydromagnesite [Mgs(CO3)(4)(OH)(2)center dot 4H(2)O], and dypingite [Mg-5(CO3)(4)(OH)(2)center dot 5H(2)O] from a synthetic wastewater comparable in chemistry to what is produced by acid leaching of ultramafic mine tailings. These precipitates occurred as micrometer-scale mineral grains and micro-crystalline carbonate coatings that entombed filamentous cyanobacteria. This provides the first laboratory demonstration of low temperature, biogenic magnesite precipitation for carbon sequestration purposes. These findings demonstrate the importance of extracellular polymeric substances in microbially enabled carbonate mineral nucleation. Fluid composition was monitored to determine carbon sequestration rates. The results demonstrate that up to 238 t of CO2 could be stored per hectare of wetland/year if this method of carbon dioxide sequestration was implemented at an ultramafic mine tailing storage facility. The abundance of tailings available for carbonation and the anticipated global implementation of carbon pricing make this method of mineral carbonation worth further investigation.
机译：碳酸盐矿物的稳定性和寿命使其成为多余的大气二氧化碳的理想汇。许多采矿作业产生的富含镁的尾矿中的生物碳酸镁矿物沉淀可以抵消采矿中的温室气体净排放量，同时为矿山废品提供价值。在这项调查中，在湿地生物反应器中的蓝细菌使菱镁矿（MgCO3），水菱镁矿[Mgs（CO3）（4）（OH）（2）中心点4H（2）O]和dydyite [Mg-5（CO3） ）（4）（OH）（2）中心点5H（2）O]，其化学成分与超镁铁矿尾矿酸浸所产生的化学废水相当。这些沉淀物是微米级的矿物颗粒和微晶碳酸盐涂层，包裹了丝状蓝细菌。这是第一个针对碳螯合目的的低温生物镁砂沉淀的实验室演示。这些发现证明了细胞外聚合物质在微生物促成的碳酸盐矿物成核中的重要性。监测流体组成以确定碳固存速率。结果表明，如果在超镁铁矿尾矿存储设施中实施这种二氧化碳隔离方法，那么每公顷湿地/年最多可以存储238吨二氧化碳。丰富的可用于碳化的尾矿以及预计在全球范围内实施的碳定价，使得这种矿物碳酸化方法值得进一步研究。

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  • 来源
    《Environmental Science & Technology》 |2019年第6期|3225-3237|共13页
  • 作者

    McCutcheon Jenine; Power Ian M.; Shuster Jeremiah; Harrison Anna L.; Dipple Gregory M.; Southam Gordon;

  • 作者单位

    Western Univ, Dept Earth Sci, London, ON N6A 5B7, Canada|Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England;

    Univ British Columbia, Dept Earth Ocean & Atmospher Sci, Vancouver, BC V6T 1Z4, Canada|Trent Univ, Sch Environm, Peterborough, ON K9L 0G2, Canada;

    Univ Adelaide, Sch Biol Sci, Adelaide, SA 5005, Australia|CSIRO Land & Water, Glen Osmond, SA 5064, Australia;

    Queens Univ, Dept Geol Sci & Geol Engn, Kingston, ON K7L 3N6, Canada|Queens Univ, Sch Environm Studies, Kingston, ON K7L 3N6, Canada;

    Univ British Columbia, Dept Earth Ocean & Atmospher Sci, Vancouver, BC V6T 1Z4, Canada;

    Univ Queensland, Sch Earth & Environm Sci, St Lucia, Qld 4072, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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