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Research Paper | October 1, 2017

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Point source effluents and its effect on the microbiological assessment of its effluent-receiving Brackish water

Mark John T. Gabule, Alma Negre Abug

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J. Bio. Env. Sci.11(4), 220-228, October 2017

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Abstract

Two identified point sources of effluents; and the water-effluent receiving brackishwater of Bulua, Cagayan de Oro City Philippines were assessed during low tide and high tide. In-situ parameters were done at the sampling sites and collected algal samples were brought to the laboratory for phytoplankton density and identification. Majority of the effluent parameters, temperature, total dissolved solids (TDS) for the two samplings sites; total suspended solid (TSS) & dissolved oxygen (DO) of the market effluent exceeded the prescribed DENR allowable values. The condition of the brackishwater was supported by its water quality variables that exceeded the tolerable limits. Microbiological examination recorded a high level of total coliform count at both tempo-spatial variations and has exceeded the water-effluent quality standards. The phytoplankton density varies significantly in terms of sampling period and the sampling areas. The highest recorded cell density was observed during high tide for both sampling areas. Blue-green algae obtained the highest planktonic cell density with reference to temporal variations and the presence of Oscillatoria sp., a well-documented bloom-forming species, with Nitzschia sp. and Navicula sp., which are pollution-sensitive species were identified in the area. A positive correlation coefficient, (r) of 0.875 were identified between phytoplankton density and the nitrates & phosphates; and r of 0.615 between phytoplankton density and the amount of lead (Pb). Regression Analysis significantly identified phytoplankton density in the brackishwater as caused by the physico-chemical parameters; nitrates (p£.01), phosphates (p£.05), lead (p£.05) and salinity (p£.01).

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Point source effluents and its effect on the microbiological assessment of its effluent-receiving Brackish water

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