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Enhanced biodegradation of light crude oil by immobilized Bacillus licheniformis in fabricated alginate beads through electrospray technique

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Abstract

Petroleum contamination of marine environments due to exploitation and accidental spills causes serious harm to ecosystems. Bioremediation with immobilized microorganisms is an environmentally friendly and cost-effective emerging technology for treating oil-polluted environments. In this study, Bacillus licheniformis was entrapped in Ca alginate beads using the electrospray technique for light crude oil biodegradation. Three important process variables, including inoculum size (5–15% v/v), initial oil concentration (1500–3500 ppm), and NaCl concentration (0–30 g/L), were optimized to obtain the best response of crude oil removal using response surface methodology (RSM) and Box–Behnken design (BBD). The highest crude oil removal of 79.58% was obtained for 1500 ppm of crude oil after 14 days using immobilized cells, and it was lower for freely suspended cells (64.77%). Our result showed similar trends in the effect of variables on the oil biodegradation rate in both free cell (FC) and immobilized cell (IC) systems. However, according to the analysis of variance (ANOVA) results, the extent of the variables’ effectiveness was different in FC and IC systems. In the immobilized cell system, all variables had a greater effect on the rate of light crude oil degradation. Moreover, to evaluate the effectiveness of free and immobilized B. licheniformis in bioremediation of an actual polluted site, the crude oil spill in natural seawater was investigated. The results suggested the stability of beads in the seawater, as well as high degradation of petroleum hydrocarbons by free and immobilized cells in the presence of indigenous microorganisms.

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All data generated or analyzed during this study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors gratefully acknowledge the Bioproducts and Biosystems Laboratories of Shahid Beheshti University, Zirab Campus, for providing the facilities and technical support.

Funding

This work was financially supported by Iranian Central Oil Fields Company (ICOFC) (Contract No. 81408).

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  1. Department of Environment, College of Environment, Karaj, Iran

    Elham Khanpour-Alikelayeh & Ahmad Talebi

  2. Faculty of New Technologies Engineering, Zirab Campus, Shahid Beheshti University, Tehran, Iran

    Elham Khanpour-Alikelayeh, Ali Partovinia & Hossein Kermanian

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  1. Elham Khanpour-Alikelayeh
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  2. Ali Partovinia
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Khanpour-Alikelayeh, E., Partovinia, A., Talebi, A. et al. Enhanced biodegradation of light crude oil by immobilized Bacillus licheniformis in fabricated alginate beads through electrospray technique. Environ Monit Assess 193, 328 (2021). https://doi.org/10.1007/s10661-021-09104-z

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