Abstract
<p><em>The dust-depressors have been developed utilizing a method of microbial induced carbonate precipitation. This microbial dust-depressor has the characteristics of high efficiency for dust suppression and environmental protection. Optimal compositions of urease dust-depressor and microbial dust-depressor have been studied. In addition, pure water, CaCl2 and super absorbent polymer are chosen to compare with new dust-depressors on the performances. The results showed that the microbial dust-depressor had 3.13 mm/min of seepage velocity and 79.1% of dust suppression efficiency, which were superior to other dust-depressors on the performance of seepage velocity and dust suppression efficiency.</em><em></em></p>
Highlights
Dust refers to small particles that are susceptible to external forces
The results showed that the microbial dust-depressor had 3.13 mm/min of seepage velocity and 79.1% of dust suppression efficiency, which were superior to other dust-depressors on the performance of seepage velocity and dust suppression efficiency
Urease activity of Bacillus pasteurii increased with the increase of temperature in the mass in the range of 30~50 °C and increased rapidly, which fluctuated slightly at 40 °C and reached the maximum (6.93 mmol urea hydrolysed·min-1) at 50 °C, within the temperature range studied
Summary
Dust refers to small particles that are susceptible to external forces. Industrial processes, dust buildup at construction sites, and motor vehicle emissions are the main sources of dust pollution. Dust could affect air quality, and have the adverse effects on the human health, such as bronchitis, lung cancer. Dust depressor could effectively control the dust of roads, factories, construction sites, mines, coal and other places, and has good environmental and economic benefits. Most condensation type depressors could damage the growth of plants because of the corrosivity (Goodrich et al, 2010). Under the economic background of energy saving and emission reduction and human consensus on environmental protection, the environment-friendly dust suppressant with excellent performance is the current research direction. Urea hydrolysis is the most efficient and easy-to-control route to http://www.scholink.org/ojs/index.php/se
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