|
| Study on Soil Organic Carbon Accumulation Characteristics of Fine-Grained Tailings Remediation |
|
Received:February 15, 2024
Revised:March 26, 2024
Accepted:March 26, 2024
Published Online:March 24, 2025
|
| View Full Text View/Add Comment Download reader |
| DOI： |
| KeyWord:Soil remediation; Organic carbon morphology; Soil aggregates; Carbon accumulation; Organic carbon components |
| Author | Institution |
| Liu Jiazhi |
School of Resources and Environmental Engineering,Wuhan University of Technology |
| Xia Ling |
School of Resources and Environmental Engineering,Wuhan University of Technology |
| Wang Zhixiang |
School of Resources and Environmental Engineering,Wuhan University of Technology |
| Lu Zijing |
School of Resources and Environmental Engineering,Wuhan University of Technology |
| Song Shaoxian |
School of Resources and Environmental Engineering,Wuhan University of Technology |
| Hu Yong |
Hubei Sanxin Gold and Copper Co,Ltd |
|
| Hits: 636 |
| Download times: 237 |
| Abstract: |
| Soilless in-situ remediation of copper and other bulk tailings is an effective way for its resourceful and harmless utilization. The soil nutrient accumulation after rehabilitation is directly related to the later field management, and it is crucial to study its organic carbon and other important nutrient accumulation rules. Therefore, in this paper, a fine-grained copper tailings remediation site in Hubei, China, we conducted a study on the unremediated, one-year and two-year soil sampling at three depths: 0-15 cm, 15-30 cm and 30-45 cm, and measured and analyzed the changing patterns of the six soil organic carbon patterns, namely, total organic carbon, easily oxidized organic carbon, particulate organic carbon, mineral-bound organic carbon, soluble organic carbon and microbial biomass organic carbon. The six types of soil organic carbon were measured and analyzed. The results showed that: 1) the fine-grained tailings soil after soil-less remediation would still accumulate soil organic carbon without the addition of exogenous organic matter; 2) the main way of organic carbon accumulation in the tailings was the increase of inert organic carbon represented by mineral-bound organic carbon, and the elevation of inert carbon helped to fix the organic carbon; 3) the particle size of the tailings agglomerates and the content of soil organic carbon were positively correlated, with inert organic carbon preferring the mineral-bound organic carbon, and inert organic carbon preferring the mineral-bound organic carbon. Inert organic carbon prefers to gather in the agglomerate structure with smaller particle size Fine-grained tailings remediation process, the activity of soil carbon pool gradually increased, and it is more likely to occur in the transformation of organic carbon. In summary, the study showed that the soil organic carbon content increased significantly after the repair of tailings soil, and mainly accumulated in the form of inert organic carbon, which showed a huge carbon sink potential in the site, the study also clarified the cumulative characteristics of the various forms of soil organic carbon in the mining area after the restoration of the site, which provided data support for guiding the tailings restoration work. |
| Close |
|
|
|