scholarly works

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Author: search.filters.author.Omoniyi, T.E

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    Assessment of noise emission levels in a selected wood processing laboratory
    (2018) Omoniyi, T.E; Fatoki, J.G.
    The study is designed to evaluate the noise levels of locally fabricated wood working machines in the wood processing laboratory of the department of agricultural and environmental engineering, university of ibadan, nigeria. maximum, minimum and average noise levels at the source were measured and recorded using a noise meter for a period of 10-20 minutes operation of each machine in the laboratory, and at sampled locations around the laboratory at distances of 5 – 30m at 5m interval during critical operating conditions of the machines. the results revealed that average noise levels from planing/thicknessing and grinding machines were above the generally advocated safe limit of 90db(a). people engaging in different teaching and educational activities in buildings that are more than 10m away from the laboratory were not exposed even during critical operating conditions. it is recommended that noise preventive measures should be implemented in the laboratory before resorting to orientate the workers on the use of protective equipment as this is a precursor to improving quality of life of workers and to ensure environmental sustainability.
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    Development of processing equipment for souvenir production from wood and plastics wastes
    (2018) Omoniyi, T.E; yinusa R.O.
    Wood wastes and consumer waste plastic wastes are abundant and constitute menace in the environment. the present means of disposing these wastes are ineffective and the machines for processing wood plastic composite are expensive, high energy consumption, required high technical know-how and are not readily available. this work was therefore designed to develop a processing equipment from locally available material s, that are cheap, energy efficient, and effective for the production of souvenirs from wood and consumer waste plastic bottles. the machines consist of melting and mixing chamber, temperature control unit, heating unit, the stirrer, the moulding unit, discharge chute and the support frame unit. a batch production takes 2hrs 45minutes with a throughput of 7.2kg/hr and machine efficiency of 72.5%. the properties of wood plastic composite produced were sorption properties (water absorption and thickness swelling), density, flexural and tensile. these were found suitable for non-structural applications and were used for souvenir productions such as broom base, picture frame, flower pots and office accessories.
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    Ethanol production from okra (hibiscus esculentus) stalk using acid and enzymatic hydrolysis
    (2018) Omoniyi, T.E; Oloruntola S.K
    Bioethanol was produced from okra (Hibiscus esculentus) stalk, a waste agricultural residue using both acid and enzymatic hydrolysis. Acid hydrolysis was carried out on okra stalk using microwave as a medium of heat. The microwave power, heating time and acid concentration were 300Watts, 13.2min and 2M, respectively. After heating the pH was adjusted to 4.5 and yeast (Saccharomyces cerevisiae) was added to induce fermentation at room temperature. Enzymatic hydrolysis was carried out using the acid hydrolysis as a pre-treatment method, the mixture was detoxified using calcium chloride. Alpha amylase and glucoamylase enzymes were added for liquefaction and saccharification at optimum condition (6.5, 60oC), (5.0, 55oC) pH and temperature respectively. Yeast (Saccharomyces cerevisiae) was introduced at pH 4.5 at room temperature. The resultant mixture of the acid and enzymatic hydrolysis processes was filtered and distilled at 78oC and the properties of the ethanol determined. The ethanol yields from acid and enzymatic hydrolysis were 8.5ml and 12.9ml, respectively. The flash points (20.5oC, 22.5oC), pour points (5.77, 5.12), cloud points (20.26oC, 21.76oC), specific gravities at 29oC, were (0.892, 0.920), kinematic viscosities (1.25mm2/s, 1.29mm2/s), moisture contents (0.52, 2.00) and densities (0.970g/cm3, 0.982g/cm3) from acid and enzymatic hydrolysis process respectively were in-line with the ASTM specification for Bioethanol. Okra stalk was successfully used to produce bioethanol using acid and enzymatic methods at 300Watts, 13.2min and 2M of acid.