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Model Analysis of Bacteria Growth Rate in Polluted Stagnant Water Environment

Uku Eruni Philip, Tom-Cyprian N.

Abstract


The Total Bacteria Count (TBC) analysis was carried out to investigate growth rate of microorganism in the stagnant water media. The analysis was also conducted to ascertain if the polluted water media can favour the growth bacteria, and hence, assist in the degradation Total Petroleum Hydrocarbon (TPH) content in water. The bacteria growth was slow from day 1 up to day 56, but began to increase rapidly between 70th and 84th day. The low concentration of TBC recorded at the initial stages of the analysis can be attributed to lack of adaptability to the water media, and also to low concentration of nutrients in the water media necessary to cause rapid growth of bacteria. According to studies, the population of bacteria in an unpolluted media can be low, but increased drastically when in contact with spilled petroleum substances. Like fresh water, bacteria population increased gradually as time increased, but increased rapidly from 70 to 80th day of the analysis. TBC in fresh water was higher in the salt water. The various results reveals that crude oil has very significant effect on the properties of fresh and salt water immediately after pollution. Total dissolved solids (TDS), conductivity, chloride, sulphate, nitrate, turbidity, alkalinity, oil & grease, iron and total hardness were instantly increased after crude oil pollution, while pH and dissolved oxygen (DO) concentration decreased. However, during the monitoring periods, all the parameters decreased with time. Also, the parameters decreased with increase in depth except alkalinity, oil & grease, iron and total hardness.

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