Browsing by Author "Salam, Kazeem Kolapo"

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    Diffusivity and kinetics model for biodegradation of PAHs in a saturated porous matrix
    (Scholarlink Research Institute Journals, 2014) Azeez, Taofik Oladimeji; Arinkoola, Akeem Olatunde; Salam, Kazeem Kolapo; Nwakaudu, Madueke Stanley
    The commercial implementation of biodegradation of polycyclic aromatic hydrocarbons (PAHs) as a bioremediation technique against physical process was due to lack of its effective and efficient diffusivity model with reaction parameters in a saturated porous matrix. The development and simulation of diffusivity model which involve reaction kinetics was aimed to provide quantitative insight on biodegradation of PAHs. The developed model obtained from the principle of conservation of matter, concepts of Fick’s law of diffusion, Malthus equation and Monod kinetics expression under isothermal condition was simulated with experimental data. The result showed that Corynebacterium sp and Pseudomonas putida were effective and PAHs exhibits pseudo first order reaction. Though, the effective diffusivity of PAHs decreases as degradation of PAHs proceeds with increased microbial mass concentration at increased penetration depth. The developed diffusivity model has been shown to be effective and not only providing quantitative insight into biodegradation of the PAHs but serves as an alternative option in the selection of microbes capable of facilitating the restoration of PAHs contaminated sites.
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    ItemOpen Access
    Influence of metakaolin and nano-clay on compressive strength and thickening time of class G oil well cement
    (Scholarone manuscript, 2019) Arinkoola, Akeem Olatunde; Salam, Kazeem Kolapo; Alagbe, Solomon Oluyemi; Afolayan, Ayodele Sunday; Salawudeen, Taofeek Olalekan; Jimoh, Monsurat Omolola; Duru, Ilozurike Ugochukwu; Hammed, Jimoh Olugbenga; Adeosun, Tunde Adamson
    In this research, the Compressive Strength (CS) and Thickening Time (TT) of oil well cement with different Metakaolin (MK) dosage was evaluated in the presence of Nanoclay (NC). The variables were randomized in a Box-Behnken Design (BBD) experiment using 5 - 15 wt. % MK by weight of cement and 5-15 wt. % NC by weight of MK. The CS and thickening time were assessed and optimized using Response Surface Methodology (RSM). The result shows that, CS increases linearly with NC and hyperbolically with MK. Cement slurries with 5–15 wt.% NC shorten TT by about 35 minutes in the presence of 5 wt.% MK. TT reduction of 103 minutes was recorded when MK was increased to 15 wt.% in the slurry with 5wt.% NC. At optimum condition, 10.78 wt. % MK and 13.73 wt. % NC resulted in CS and TT of 3029±2.65 psi and 410±1.25 minutes, respectively.