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Articles by O.I. Asubiojo
Total Records ( 4 ) for O.I. Asubiojo
  A.O. Ogunfowokan , E.K. Okoh , A.A. Adenuga and O.I. Asubiojo
  The treatment performance of the sewage treatment oxidation pond of a Nigerian University was assessed in terms of pH, electrical conductivity, biochemical oxygen demand (BOD5) and nutrient removal from the influent. These parameters were simultaneously monitored in the receiving stream, influent and effluents. Significant pollution of the receiving stream was indicated for BOD5, nitrate, phosphate, suspended solids and pH. The levels of these parameters in the sewage effluent exceeded the Nigerian Federal Environmental Protection Agency tolerance limits for the effluents to be discharged through public sewers into a stream. In addition, the levels of some trace metals: Pb, Fe, Mn, Zn and Cd were also determined in the influent, effluent of the oxidation pond and the receiving stream. High mean levels of Pb, Zn and Fe were observed in the receiving stream and exceeded the WHO guideline levels for drinking water and for protection of aquatic ecosystem. This unfortunately, may affect the `health` of the aquatic ecosystem in the receiving stream and the health of the rural dwellers who use the stream water directly for domestic purposes without treatment.
  F.M. Adebiyi , O.I. Asubiojo , T.R. Ajayi and L.M. Durosinmi
  Multisolvent determination of the pH of soils from areas of Nigeria bituminous sand deposits was carried out using the electrometric method to establish the pH of the soils before the commencement of the exploitation of the bituminous sands and also to know the variation of pH of the soils using variable solvents over a range of soil to solvent dilution ratios. Soil sampling was done at two different depths viz., 0-50 cm and 50-100 cm and the samples were prepared for pH measurements using three commonly recommended solvents viz: distilled water, 0.01 M and 1 M KCI solutions. The results indicate the soil types are acid soils. This research will also add to the existing exploration data on the study area before the commencement of the exploitation of the natural resources.
  A. Akinlua and O.I. Asubiojo
  The physico-chemical and trace metal analyses of battery factory wastewater were carried out in this study. Samplings were done three times in a period of nine months at settling tank (i.e., before treatment) and at final discharge point (after treatment). High levels of pH, conductivity, Pb, Fe and Zn were observed, which may affect the health of the aquatic ecosystem of the receiving river. The high levels of conductivity, Pb, Fe and Zn may also adversely affect the health of the community that uses the receiving river directly for domestic use without treatment. The treatment technique employed by the factory is grossly ineffective for the removal of Pb, Fe and Zn but effective for removal of Cu and Cd.
  T.R. Ajayi , A.A. Oyawale , F.Y. Islander , O.I. Asubiojo , D.E. Klein and A.I. Adediran
  Geochemical data of two borehole samples that penetrated Oshosun formation in Oja-Odan area located in the western part of the Dahomey basin of SW Nigeria were studied. A total of twenty-nine elements, comprising three major, twenty trace and six rare earth elements were considered with the objective of determining the distribution pattern, source rocks and the environment of deposition of the sediments. The results showed that the mean concentrations for Fe, Na and K are 3.725, 0.073 and 0.683 wt.%, respectively. The relatively high Fe content is attributed to accumulation of goethite in the phosphatic shales of the formation. The absolute REE concentrations are in the order of clay>grey shale>black shale. On the average, the patterns indicate that the sediments were derived from granite and grey gneiss of nearby basement rocks but their accumulation was strongly controlled by mechanical and chemical processes of sedimentation. Trace element data on Cr and Co shows that the sediments of Oshosun formation are argillaceous and were deposited in a shallow oxygen poor environment consistent with the model of structural framework of a series of horst and grabens of the Dahomey basin.
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