Direct Air Capture of CO(2) through Carbonate Alkalinity Generated by Phytoplankton Nitrate Assimilation.
Direct Air Capture of CO(2) through Carbonate Alkalinity Generated by Phytoplankton Nitrate Assimilation.
复制标题
DOI：
10.3390/ijerph20010550
复制
发表时间：
2022-12-29
影响因子：
--
通讯作者：
Liu, Cong-Qiang
中科院分区：
文献类型：
--
作者：
Su, Jing;Teng, Hui (Henry);Wan, Xiang;Zhang, Jianchao;Liu, Cong-Qiang
关键词：
尽管人们一致认为，到2100年将全球气温上升幅度控制在比工业化前水平高1.5°C以内，可以减少气候变化达到不可逆转点的可能性，但最新的政府间气候变化专门委员会（IPCC）报告警告说，到2100年，现有的温室气体减排承诺仅足以将气温上升控制在3-4°C。严峻的现实不仅要求更快地部署现有的二氧化碳减排技术，而且要求开发更具成本效益的碳去除战略。在这里，我们报道了一种基于海洋碱度的CO2封存方案，利用海洋光合微生物在硝酸盐同化过程中的质子消耗，以及随之而来的海水CO2吸收的增强。利用原生海洋浮游植物群落进行的台式实验证实，在含硝酸盐培养基中进行微生物培养后的3-5天内，海水的pH值从~8.2上升到~10.2。在持续的养分供应下，碱性条件能够维持，但一旦生物质被去除，碱性条件就会恢复正常（pH ~ 8.2-8.4）。对溶解的无机碳的δ13C测量表明，大气中的CO2对实验海水中的碳酸盐碱度有显著的贡献，证实了从空气中直接捕获二氧化碳的发生。热力学计算表明，当海水pH从10.2降至8.2时，理论碳去除率为~0.13 mol CO2/L。一项成本分析（使用标准生物反应器废水处理厂作为二氧化碳捕获的模板，以及用于硝酸盐回收的改良移动床生物膜反应器）表明，100万吨二氧化碳/年的运行成本约为40美元/吨二氧化碳，比目前任何可用的直接空气捕获技术便宜2.5-5.5倍，更符合快速部署大规模CCS系统的25-30美元/吨二氧化碳的价格。
Despite the consensus that keeping global temperature rise within 1.5 °C above pre-industrial level by 2100 reduces the chance for climate change to reach the point of no return, the newest Intergovernmental Panel on Climate Change (IPCC) report warns that the existing commitment of greenhouse gas emission reduction is only enough to contain the warming to 3–4 °C by 2100. The harsh reality not only calls for speedier deployment of existing CO2 reduction technologies but demands development of more cost-efficient carbon removal strategies. Here we report an ocean alkalinity-based CO2 sequestration scheme, taking advantage of proton consumption during nitrate assimilation by marine photosynthetic microbes, and the ensuing enhancement of seawater CO2 absorption. Benchtop experiments using a native marine phytoplankton community confirmed pH elevation from ~8.2 to ~10.2 in seawater, within 3–5 days of microbial culture in nitrate-containing media. The alkaline condition was able to sustain at continued nutrient supply but reverted to normalcy (pH ~8.2–8.4) once the biomass was removed. Measurements of δ13C in the dissolved inorganic carbon revealed a significant atmospheric CO2 contribution to the carbonate alkalinity in the experimental seawater, confirming the occurrence of direct carbon dioxide capture from the air. Thermodynamic calculation shows a theoretical carbon removal rate of ~0.13 mol CO2/L seawater, if the seawater pH is allowed to decrease from 10.2 to 8.2. A cost analysis (using a standard bioreactor wastewater treatment plant as a template for CO2 trapping, and a modified moving-bed biofilm reactor for nitrate recycling) indicated that a 1 Mt CO2/year operation is able to perform at a cost of ~$40/tCO2, 2.5–5.5 times cheaper than that offered by any of the currently available direct air capture technologies, and more in line with the price of $25–30/tCO2 suggested for rapid deployment of large-scale CCS systems.
登录
查看更多内容
影响因子：
11.1
作者：
Fasihi, Mandi;Efimova, Olga;Breyer, Christian
通讯作者：
Breyer, Christian
DOI：
10.1073/pnas.1012253108
发表时间：
2011-12-20
影响因子：
11.1
作者：
House, Kurt Zenz;Baclig, Antonio C.;Herzog, Howard J.
通讯作者：
Herzog, Howard J.
中国上空氮沉降增强
影响因子：
64.8
作者：
Liu, Xuejun;Zhang, Ying;Zhang, Fusuo
通讯作者：
Zhang, Fusuo
影响因子：
3.4
作者：
Ge, Shaokui;Smith, Richard G.;Carruthers, Raymond I.
通讯作者：
Carruthers, Raymond I.
影响因子：
11.8
作者：
Lu, Jia-Yuan;Wang, Xue-Meng;Li, Wen-Wei
通讯作者：
Li, Wen-Wei