ABSTRACT
The global pandemic forced the closure of learning institutions and an abrupt switch from physical (face-to-face) learning to e-learning. The Academic Staff Union of University postulates that e-learning will not work during the period. This paper evaluates the attitude of engineering students in a Nigerian private university to e-learning during the period of national lockdown in Nigeria. A questionnaire was designed to collect students' attitudes about learning efficiency, quality, and associated cost. Ease or difficulty of the transition to e-learning, digital skills requirement, commitment to e-learning, digital skills improvement, and preferred test mode were studied. In addition, the relationship between gender and preferred test mode was examined. 73 students responded to the questionnaire. A significantly lower percentage (4%) of the engineering students prefer the e-learning method, while a more significant percentage (62%) of the respondents prefer blended learning. Gender has no significant relationship with the preferred learning mode of the students. Moreover, the students found the e-learning approach to be expensive. Finally, there is still much to be done by Nigerian educational stakeholders to improve the experience of e-learning in Nigeria.
ABSTRACT
This study investigates the utility of a hybrid adsorption-membrane process for cake compressibility evaluation of biotreated palm oil mill effluent (BPOME). A low-cost empty fruit bunch (EFB) based powdered activated carbon (PAC) was employed for the upstream adsorption process with operation conditions of 60 g/L PAC dose, 68 min mixing time, and 200 rpm mixing speed to reduce the feed-water strength and alleviate probable fouling of the membranes. Two polyethersulfone microfiltration (MF) membranes of 0.1 and 0.2 µm pore sizes were investigated under constant transmembrane pressures (TMP) of 40, 80, and 120 kPa. The compressibility factors (z), which was obtained from the slopes of power plots (function of specific cake resistance (α) and pressure gradient) were evaluated. The z values of 0.32 and 0.52, respectively obtained, for the 0.1 and 0.2 µm MF membranes provided compressible and stable z values as observed from their power plots. Besides, these membranes were found suitable for the measurement of z since the results are in consonance with the established principle of cake compressibility. Moreover, the upstream adsorption mitigated the clogging of the membranes which ultimately led to moderate resistances and cake compressibility. These are indications that with the secondary cake filtration, a sustainable flux can be achieved during BPOME filtration. The membranes exhibited close to 100% restoration after cleaning.
