Microbial-induced mineralization and cementation of fugitive dust and engineering application: Fid-Bau Portal

Microbial-induced mineralization and cementation of fugitive dust and engineering application

Zhan, Qiwei / Qian, Chunxiang / Yi, Haihe

Graphical abstract The control of fugitive dust is becoming a hot spot at home and abroad for a time. Due to high energy consumption, large investment, complex operation and likely secondary pollution to the environment, physical and chemical methods are relatively difficult to be applied to the control of fugitive dust in large areas. In response to these aspects, cementitious materials of biological carbonates were prepared to mineralize and cement loose fugitive dust. In this study, fugitive dust could be controlled effectively in that cementitious materials of biological carbonates had superior mechanical properties, such as wind-erosion resistance, rainfall-erosion resistance, moisture and ecological compatibility. Display Omitted

Highlights • A new method was found to mineralize and cement fugitive dust. • Microstructure of calcite-consolidation-layer was analyzed. • Calcite-consolidation-layer had good mechanical properties.

Abstract Microbial-induced mineralization and cementation of fugitive dust, as a new green and environmental-friendly method, is being paid extensive attention to in that it has low cost, simple operation and rapid effects. In this research, carbon dioxide was absorbed, transformed and produced carbonate ions under the enzymatic action of Paenibacillus mucilaginosus. Meanwhile, carbonate ions could mineralize calcium ions into calcite-consolidation-layer (CCL) which have certain mechanical properties. In this process, the fugitive dust was cemented and formed larger particles bond in the calcite-consolidation-layer (CCL). The particular composition and the morphology of calcite-consolidation-layer (CCL) were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, cementitious materials of biological carbonates were used to the control of fugitive dust in engineering application. The results suggested that cementitious materials of biological carbonates could mineralize and cement fugitive dust, then form the calcite-consolidation-layer (CCL). Meanwhile, cementitious materials of biological carbonates had superior mechanical properties, such as wind-erosion resistance, rainfall-erosion resistance, moisture and ecological compatibility.