Biological treatment of high salinity produced water by microbial consortia in a batch stirred tank reactor: Modelling and kinetics study |
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| Authors: | Ali Reza Pendashteh Naz Chaibakhsh Fakhrul-Razi Ahmadun |
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| Affiliation: | 1. The Caspian Sea Basin Research Centre, University of Guilan, Rasht, Iran;2. Department of Chemistry, Faculty of Science, University of Guilan, Rasht, Iran;3. Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang, Selangor D.E., Malaysia;4. Department of Civil Engineering, National Defence University of Malaysia, Sungai Besi Camp, Malaysia |
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| Abstract: | This study was performed to evaluate the potential of acclimated halophilic microorganisms, commercial microorganisms, and microorganisms from polluted soil to degrade crude oil in high salinity oily wastewater (synthetic produced water) at different salt concentrations ranging from zero to 250,000?mg?L?1 of total dissolved solids (TDS). The highest degradation of crude oil (>60%) was found for acclimated halophilic microorganisms at TDS of 35,000?mg?L?1. An increase in the TDS concentrations above 145,000?mg?L?1 leads to a significant decrease in the growth of microorganisms. The results showed that efficiency of the commercial microorganisms was less than the acclimated halophilic microorganisms. The oil biodegradation followed substrate inhibition kinetics and the specific growth rate were fitted to the Haldane model. The biokinetic constants for the saline oily water at TDS of 35,000?mg?L?1, i.e., Y, Ks, µmax, and 1/Ki, were 0.21?mg?MLSS/mg crude oil, 0.27?mg?L?1, 0.019?h?1, and 0.002?mg?L?1, respectively. |
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| Keywords: | Biodegradation crude oil hydrocarbons hypersalinity produced water |
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