311 results for browsing: Unknown
Activation methods for enhancing CO2 mineralization via mine tailings—A critical review
Milad Norouzpour, Rafael M. Santos, Yi Wai Chian
ABSTRACT:
Greenhouse gas emissions from fossil fuel combustion exacerbate global warming, necessitating scalable and cost-effective carbon capture and storage (CCS) strategies. Mineral carbonation has emerged as a promising solution, permanently converting carbon dioxide (CO2) into stable carbonates while simultaneously repurposing mine tailings for sustainable waste management. Ultramafic and mafic mine tailings, which are rich in Mg- and Ca-bearing minerals, provide abundant and reactive feedstocks for CO2 sequestration. This review examines the chemical, mineralogical, and physical characteristics ...
Preprints and Data for Carbon Dioxide Removal (CDRXIV)
Grace Andrews, Freya Chay, Sam Hindle, Simon Nicholson, Jennifer Pett-Ridge
ABSTRACT:
CDRXIV is a new open access platform for sharing preprints and data related to carbon dioxide removal (CDR).
https://cdrxiv.org/
Potential of Co-practicing Enhanced Rock Weathering and Geologic Carbon Storage
Hang Deng, Qi Li
ABSTRACT:
Geologic carbon storage (GCS) is an important technology for mitigating climate change, and hundreds to thousands of gigatons of CO2 needs to be stored via GCS by 2100 to achieve the 2 °C or 1.5 °C target.1 One challenge that hinders the large-scale deployment of GCS is the risk of the injected CO2 migrating through abandoned wells and/or faults/fractures into overlying formations or the atmosphere. Assessments that considered extensive empirically measured and simulated data of GCS suggests that the surface seepage rate is highly likely to be less than 0.05% stored/year,2 corresponding to CO2 fluxes at the land surface ...
Direct measurement of carbon dioxide removal due to enhanced weathering
Ella Milliken, Alex Woodley, Noah Planavsky
ABSTRACT:
Enhanced weathering (EW) is a durable carbon removal strategy with clear pathways to produce significant global supply on a decadal scale. Despite increasing interest and investment in this process, there have been limited direct, continuous observations of weathering rates. In this study, we monitor a basalt-applied soybean plot in Southeast Virginia using continuous in-soil CO2 monitors. We provide clear evidence of CO2 flux reduction within the soil profile, equating to 1.04 t/ha/yr. This removal is most substantial in the active growing season and following significant rain pulses. This work ...
Soil cation storage is a key control on the carbon removal dynamics of enhanced weathering
Y. Kanzaki, N.J. Planavsky, S. Zhang, J. Jordan, T.J. Suhrhoff, C.T. Reinhard
ABSTRACT:
Significant interest and resources are currently being channeled into techniques for durable carbon dioxide removal (CDR) from Earth’s atmosphere. A particular class of these approaches — referred to as enhanced weathering — seeks to modify the surface alkalinity budget to store CO2 as dissolved inorganic carbon species. Here, we use a reaction-transport model designed to simulate enhanced weathering in managed lands to evaluate the throughput and storage timescales of anthropogenic alkalinity in agricultural soils in the coterminous U.S. We find that lag ...
Estimates vary but credible evidence points to gigaton-scale climate change mitigation potential of biochar
Zhe Han Weng, Annette L. Cowie
ABSTRACT:
Biochar is a carbon dioxide (CO2) removal strategy that supports food security, sustainable land management and the circular economy. Nineteen published studies estimate global climate change mitigation potential of biochar at 0.03 to 11 Pg CO2 equivalent yr−1. Reconciling this range requires consideration of biochar science. Biochar systems durably sequester carbon, can reduce soil greenhouse gas (GHG) emissions, displace fossil fuel emissions through use of syngas, and avoid GHG emissions from residues. We reviewed the contributions to CO2 removal and GHG emissions reduction. Divergence between studies ...
Microscopic investigation of incipient basalt breakdown in soils: implications for selecting products for enhanced rock weathering
Tarrah M. Burke, Balz S. Kamber, David Rowlings
ABSTRACT:
Digital optical and scanning electron microscopy (SEM) was used to study advance of incipient weathering of basaltic rock particles for two enhanced rock weathering (ERW) sites in Eastern Australia and three natural basalt sites (New Zealand and Eastern Australia). At the ERW sites, weathering of amended rock particles (up to 8 mm in diameter) induced a significant increase (1–1.5 pH unit) in shallow soil pH. After 14 months of incubation at the more recent site, 6–8 mm basalt particles showed dissolution of glass and olivine while pyroxene and plagioclase remained largely fresh. No ...
Enhancement of Biochar Carbon Sequestration Through Mineral Regulation: Effects and Mechanisms
Fan Yang, Pengxiao Gao, Lin Chi, Zhongyu Gao, Yajun Wang, Liu Luo, Bo Liu, Xinyue Liu, Jingke Sima
ABSTRACT:
The conversion of waste biomass into biochar through inert pyrolysis represents a promising strategy for carbon sequestration. However, biochar production is often accompanied by the release of small molecular chemical substances during pyrolysis, and the resulting biochar is susceptible to environmental degradation. To enhance the carbon retention rate of biochar during pyrolysis and its stability in the environment, this study explored the incorporation of various metal soluble salts (CaCl2, Ca(H2PO4)2, MgCl2, FeCl3) and clay minerals ...
Long-term trends of streamwater chemistry in an agricultural watershed: Effects of anthropogenic and climatic factors
Fengchao Sun, Rob A. Rioux, William A. Miller-Brown, Bibek Shrestha, James B. Shanley, Noah J. Planavsky, Peter A. Raymond, James E. Saiers
ABSTRACT:
The chemistry of headwater streams is a key indicator of the health of riparian zones and surrounding terrestrial ecosystems. This chemistry is shaped by biogeochemical processes, including chemical weathering, and anthropogenic activities that interact with one another and are sensitive to climate. Elucidating trends in streamwater chemistry and the drivers that underpin them is essential for informing land-management decisions and anticipating water-quality issues that may affect downstream ...
