How bacteria can help prevent coal ash spills news nc state university electricity nw


Coal ash is produced by coal-fired power plants and is often stored in ponds. If the walls electricity el paso apartments of these ponds fail, they can spill coal ash into nearby surface waters – as happened in the wake of Hurricane Florence in 2018, in Virginia’s Dan River in 2014, and basic electricity quizlet in Tennessee in 2008. These spills can have significant consequences, because coal ash contains contaminants such as mercury and arsenic.

The most recent paper on the work, “ Enhancement of Coal gas vs electric water heater cost per year Ash Compressibility Parameters using Microbial Induced Carbonate Precipitation,” is published in the Journal of Geotechnical and Geoenvironmental Engineering. The earlier paper on the work, “ Microbial Induced Calcium Carbonate Precipitation in Coal Ash,” is published open access in the journal Géotechnique. Both papers were co-authored by Shahin Safavizadeh, a former Ph.D. student at NC State e85 gas stations in ohio; and Mohammed A. Gabr, Distinguished Professor of Civil Engineering and Construction in NC State’s Department of Civil, Construction and gas 78 Environmental Engineering.

Abstract: Microbial induced calcium carbonate precipitation (MICP) was experimentally implemented on two coal ash materials (i.e., CA1 and CA3) to investigate the efficacy of the treatment on the hydraulic and compressibility properties of the d cypha electricity futures material. Oedometers used in testing were modified to enable the injection of treatment solutions and to provide the ability to monitor shear wave velocity. The coal ash specimens were treated to reach different levels of shear wave velocity h gas l gas unterschied, which corresponded to varying amounts of CaCO3 content. The hydraulic conductivity and shear wave velocity values were assessed throughout the loading process. Results indicate that the MICP treatment decreased the compressibility (compression index decreased by a factor as high as 2), and la gas prices now the hydraulic conductivity (decreased by a factor as much as 0.05). The slope of log(σ′V)-VS relationship (β’) decreased from 0.31 for the untreated material to 0.01 with treatment. In parallel, the increase gastritis in the shear wave velocity after treatment increased the intercept of the relationship between log(σ′V)-VS (i.e., α’) from 38 m/s to 383 m/s. The correlation between small-strain and u gas station near me large-strain parameters are explored and discussed.

Abstract: The long-term storage of coal ash in impoundments can lead to concerns of structural stability as well as trace element migration to local surface gaz 67 dakar water and groundwater sources. Microbial induced calcium carbonate precipitation (MICP) offers a potential approach for minimising leachability of heavy metal trace elements from coal ash by calcium carbonate cementation. In this study, a protocol for MICP treatment of coal ash has been experimentally developed b games play online. The MICP treatment is applied to three coal ashes from different power plants, and their response to the developed electricity storage association treatment protocol is assessed. Possible factors affecting the MICP treatment of coal ash are discussed in terms of efficacy and inhibition of the stabilisation process. For this purpose, several approaches such as shear wave velocity, electrical conductivity, pH measurement, acid washing, scanning electron microscopy, energy dispersive X-ray spectroscopy electricity questions grade 9 and X-ray photoelectron spectroscopy were implemented. The results indicated that carbon/carbide content of the fly ash material has an important role in the efficacey of the MICP treatment process electricity deregulation wikipedia. The most likely explanation is carbon/carbide aids in the nucleation of calcium carbonate precipitation.