Groups keyboard shortcuts have been updated
Dismiss
See shortcuts

Enhanced Rock Weathering as a Source of Metals to Promote Methanogenesis and Counteract CO2 Sequestration

11 views
Skip to first unread message

Geoengineering News

unread,
Jan 10, 2025, 1:46:04 PMJan 10
to CarbonDiox...@googlegroups.com
https://pubs.acs.org/doi/abs/10.1021/acs.est.4c04751

Authors
Donglei Zhang, Qiang Zeng, Hongyu Chen, Dongyi Guo, Gaoyuan Li, Hailiang Dong


Published October 21, 2024

Abstract
Enhanced weathering of (ultra)mafic rocks has been proposed as a promising approach to sequester atmospheric CO2 and mitigate climate change. However, these silicate rocks contain varying amounts of trace metals, which are essential cofactors of metallaenzymes in methanogens. We found that weathering of crushed peridotite and basalt significantly promoted the growth and methanogenesis of a model methanogen─Methanosarcina acetivorans C2A under the condition of excess substrate. The released trace metals from peridotite and basalt, especially Fe, Ni, and Co, accounted for the promotion effect. Observation at different spatial scales showed a close association between the rocks and cells. Proteomic analysis revealed that rock amendment significantly enhanced the expression of core metalloenzymes in the methylotrophic methanogenesis pathway. Our study uncovers a previously unrecognized but important negative effect of enhanced rock weathering on methane production, which may counteract the carbon sequestration effort.

Source: Environmental Science & Technology
Reply all
Reply to author
Forward
0 new messages