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BIODEGRADATION POTENTIAL OF RHIZOSPHERIC MICROORGANISMS OF RHIZOPHORA RACEMOSA IN CRUDE OIL CONTAMINATED MANGROVE SWAMP IN THE NIGER DELTA

  • O. R. Aina Department of Microbiology, Faculty of Life Sciences, University of Benin, Benin City, Nigeria
  • E. I. Atuanya Microbiology Department, Faculty of Science University of Lagos, Akoka Nigeria
  • C. E. Oshoma Department of Microbiology, Faculty of Life Sciences, University of Benin, Benin City, Nigeria
  • A. E. Omotayo Department of Microbiology Department, Faculty of Science University of Lagos, Akoka Nigeria
  • O. N. Olaleye Department of Biological Sciences, School of Pure and Applied Sciences, Lagos State Polytechnic, Ikorodu, Nigeria
Keywords: Rhizophora racemosa, Rhizospheric, Rhizomicrobes, Mangrove swamp, TPH and TOG analyzer, Shake flask degradation test, Biodegradation potential

Abstract

Rhizophora racemosa (red mangrove tree) belongs to the family Rhizophoraceae; it is an important constituent of the mangrove swamp in Niger Delta, an oil producing region in Nigeria. The remediation of soils containing organic pollutants is possible with the use of microbial communities when the ecology is understood for potentials maximization. This study investigated the biodegradation potential of rhizospheric microorganisms of Rhizophora racemosa in crude oil- contaminated mangrove swamp in the Niger Delta.The total microbial count was determined by the serial dilution method. The hydrocarbon-utilizing bacteria and fungi were enumerated using Mineral Salts Agar containing crude oil as the sole carbon source. The biodegradation potential of these rhizomicrobes was determined using screen test, shake flask degradation tests, Total Organic Gas (TOG) and Total Petroleum Hydrocarbon (TPH) InfraCal Analyzer (HATR-T2 and CH). The turbidity, total organic gas (TOG-N) and total petroleum hydrocarbon were measured weekly for twenty-eight days. Hydrocarbon-degrading microbes isolated from the rhizosphere were identified as Marinococcus sp., Azotobacter sp., Acinetobacter sp. Aspergillus niger, Aspergillus flavus and Candida albicans. The highest rate of TPH reduction was recorded in Acinetobacter sp. (from 150 mg/L on day 1 to ˂0.0031 mg/L on day 14). This was followed by Candida albicans (148mg/L on day 1 to 2.68mg/L on day 28) and Aspergillus flavus (150mg/L on day 1 to 4.21mg/L on day 28) In conclusion, it can be inferred that the some rhizospheric microbes of Rhizophora racemosa can efficienctly degrade hydrocarbon up to 100% rate over a period of 28 days.

Published
2021-12-01
How to Cite
Aina, O. R., Atuanya, E. I., Oshoma, C. E., Omotayo, A. E., & Olaleye, O. N. (2021). BIODEGRADATION POTENTIAL OF RHIZOSPHERIC MICROORGANISMS OF RHIZOPHORA RACEMOSA IN CRUDE OIL CONTAMINATED MANGROVE SWAMP IN THE NIGER DELTA. African Journal of Health, Safety and Environment, 2(2), 91-102. https://doi.org/10.52417/ajhse.v2i2.172