Journal of Innovative Research in Engineering Sciences



Feasibility of oil pollution elimination from water by microorganisms at the water recycling plant of refineries

Hamid Keykhah

In this study, contamination of microbial indicators including total count of microorganisms, total count of forms, identification of Escherichia coli and Bacillus cereus counting were investigated in 80 samples with oil wastewater pollutions, oil pollutions, pollutions caused by condensates and petroleum products pollutions as well as non- oil polluted samples supplied in Khouzestan province refineries. Results showed that due to oil pollutions and diseases created by Bacillus cereus, contamination rate in 55% of studied pollutions was higher than the allowed limit. With regard to coliform contamination elimination rate, 55% of samples had a pollution rate higher than the allowed limit and also, contamination rate of samples with pollution caused by oil wastewater was significantly higher compared to samples with petroleum pollutions. With regard to the pollution dispersion among samples, conditions for coliforms and Bacillus cereus were the same. The difference was that contamination rates of products pollutions and pollutions caused by condensates were approximately equal to 41 percent. Results obtained from bacteria in pollutions caused by oil wastewater and oil pollutions indicated that contamination rates of samples with pollutions caused by oil wastewater and samples with oil pollutions were 47.5 and 15 percent, respectively. Also, with regard to contamination elimination from pollutions caused by oil wastewater, there is a significant difference among samples with pollutions caused by condensates. With regard to pollution elimination, oil pollutions were as follows: pollutions caused by oil wastewater, products pollutions and pollutions caused by condensates. 

Keyword:1- Microbial contamination
Keyword:2- oil pollutions
Keyword:3- microorganism
Keyword:4- oil wastewater

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