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标题：Practical and thermodynamic constraints on electromicrobially accelerated CO 2 mineralization
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作者：Sabrina Marecos ; Rae Brigham ; Anastacia Dressel 等
期刊名称：iScience
印刷版ISSN：2589-0042
出版年度：2022
卷号：25
期号：8
页码：1-20
DOI：10.1016/j.isci.2022.104769
语种：English
出版社：Elsevier
摘要：SummaryBy the end of the century, tens of gigatonnes of CO2will need to be removed from the atmosphere every year to maintain global temperatures. Natural weathering of ultramafic rocks and subsequent mineralization reactions can convert CO2into ultra-stable carbonates. Although this will draw down all excess CO2, it will take thousands of years. CO2mineralization could be accelerated by weathering ultramafic rocks with biodegradable lixiviants. We show that if these lixiviants come from cellulosic biomass, this demand could monopolize the world’s biomass supply. We demonstrate that electromicrobial production technologies (EMP) that combine renewable electricity and microbial metabolism could produce lixiviants for as little as $200 to $400 per tonne at solar electricity prices achievable within the decade. We demonstrate that EMP could make enough lixiviants to sequester a tonne of CO2for less than $100. This work highlights the potential of this approach and the need for extensive R&D.Graphical abstractDisplay OmittedHighlights•Bio-production of acids to sequester 20 GtCO2yr−1could monopolize global agriculture•Electromicrobial production could produce acids for as little as $200 to $400 per tonne•Electromicrobial production could make acids to sequester 1 tonne CO2for under $100Microbiology; Biotechnology; Engineering; Energy sustainability