Oluseyi  E. Ewemoje, S.O.  Ihuoma, 
    Microbial Contaminant Effects of Pre-Treated Sewerage Wastewater on Receiving 
  Surface Water in Ibadan, Nigeria,
    Environmental Research Journal,
    Volume 7,Issue 2,
    2013,
    Pages 25-29,
    ISSN 1994-5396,
    erj.2013.25.29,
    (https://makhillpublications.co/view-article.php?doi=erj.2013.25.29)
    Abstract: Microbial content of sewage wastewater and the impact on microbial population of receiving surface water was studied in university of Ibadan, Oyo State, Nigeria. Sewage wastewater samples were collected over 3 months period and examined for microbial content at the University of Ibadan surface water receiving pre-treated wastewaters from staff residential quarters, academic departments and students hostels. Surface water samples that were contaminated as a result of the sewage discharge were collected and analyzed for microbial content as compared to samples without sewage contamination 10 m upstream section from the point of discharge (control). Some physico-chemical parameters of the water samples were also examined. The sewage wastewater samples were highly contaminated; sewage wastewater showed mean faecal coliform count of 2.4x10<SUP>3</SUP> cfu/100 mL, mean total coliform count of 7.5x10<SUP>5</SUP> cfu/100 mL and mean total aerobic count of 6.7x10<SUP>7</SUP> cfu/100 mL. In the contaminated surface water sample, mean faecal coliform count (2.2x10<SUP>2</SUP> cfu/100 mL), total coliform count (3.1x10<SUP>5</SUP> cfu/100 mL) and total aerobic count (8.2x10<SUP>6</SUP> cfu/100 mL) are high compared to their respective values (1.1x10<SUP>2</SUP>, 1.2x10<SUP>5</SUP> and 6.3x10<SUP>6</SUP> cfu/100 mL) for the control samples. These results were higher than Federal Environmental Protection Agency (FEPA) permissible limit of (500 cfu/100 mL). In this study, high microbial load in sewage wastewater with negative effects on microbial population in the receiving stream, further confirmed the need to pre-treat wastewater rather than discharging directly it to the environment.
    Keywords: Sewage;wastewater;microbial load;stream flow;Nigeria