Application of Bacillus subtilis for reducing ash and sulfur in coal   总被引：2，自引：0，他引：2  

M. A. Abdel-Khalek  A. A. El-Midany 《Environmental Earth Sciences》2013,70(2):753-760

The replacement of coal with other energy sources is due to the presence of harmful impurities such as sulfur that can lead to emission of harmful and corrosive gases such as H₂S and SO₂. These gases can affect the human health due to its toxicity. Also, the mineral matter (ash) can cause several types of respiratory system diseases due to the presence of heavy metals and formation of hazardous compounds while burning of coal. In order to avoid the production of such emissions, the researchers all over the world were looking for a methodology that can eliminate or reduce these impurities from coal. Therefore, the current study aims at decreasing the sulfur and ash content in Egyptian coal (Maghara coal), using bioflotation technique. The effect of Bacillus subtilis (B. subtilis) on the removal/reduction of sulfur and ash was investigated. The affinity of B. subtilis to coal surface was characterized using zeta-potential, adsorption tests and Fourier transform infrared. The bioflotation results showed that, at optimum conditions, a clean coal contains 0.92 % total sulfur and 1.95 % ash and yield exceeding 72 % was obtained from the starting coal containing 3.3 % sulfur and 6.65 % ash.  相似文献   

Estimation of near-surface geotechnical parameters using seismic measurements at the proposed KACST expansion site, Riyadh, KSA     

Hashim Almalki  Abdel-Khalek El-Werr  Kamal Abdel-Rahman 《Arabian Journal of Geosciences》2011,4(7-8):1131-1150

Eight shallow seismic refraction profiles were conducted at the proposed KACST expansion site, northwest of Riyadh, to estimate the near-surface geotechnical parameters for construction purposes. Both compressional (P) and shear (S) waves were acquired, processed, and interpreted using “time-term” technique which is a combination of linear least squares and delay time analysis to invert the first arrivals for a velocity section. The most important geotechnical near-surface parameters such as stress ratio, Poisson’s ratio, material index, concentration index, N value, and foundation material-bearing capacity are calculated. The results of these seismic measurements were compared with the results of borehole report in the project area in terms of number of layers, the lithological content, thicknesses, and N values of rock quality designation. A good matching between the results was observed particularly at the sites of boreholes.  相似文献   

Structural setting of the Hafafit Gneisses Eastern Desert,Egypt     

M.L. Abdel-Khalek  M. Abdel-Wahed 《Precambrian Research》1982,16(4):A43

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