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Beyond N and P: The impact of Ni on crude oil biodegradation

Lookup NU author(s): Obioma Mejeha, Professor Ian Head, Dr Angela SherryORCiD, Dr Clare McCannORCiD, Dr Peter Leary, Dr Martin Jones, Professor Neil GrayORCiD



This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


N and P are the key limiting nutrients considered most important for the stimulation of crude oil degradation but other trace nutrients may also be important. Experimental soil microcosms were setup to investigate crude oil degradation in the context of Ni amendments. Amended Nickel as NiO, NiCl2, or, a porphyrin complex either inhibited, had no effect, or, enhanced aerobic hydrocarbon degradation in an oil-contaminated soil. Biodegradation was significantly (95% confidence) enhanced (70%) with low levels of Ni-Porph (12 mg/kg) relative to an oil-only control; whereas, NiO (200 and 350 mg/kg) significantly inhibited (36 and 87%) biodegradation consistent with oxide particle induced reactive oxygen stress. Microbial community compositions were also significantly affected by Ni. In 16S rRNA sequence libraries, the enriched hydrocarbon degrading genus, Rhodococcus, was partially replaced by a Nocardia sp. in the presence of low levels of NiO (12 and 50 mg/kg). In contrast, the highest relative and absolute Rhodococcus abundances were coincident with the maximal rates of oil degradation observed in the Ni-Porph amendedsoils. Growth dependent constitutive requirements for Ni-dependent urease or perhaps Nidependent superoxide dismutase enzymes (found in Rhodococcus genomes) provided a mechanistic explanation for stimulation. These results suggest biostimulation technologies, in addition to N and P,should also consider trace nutrients such as Ni tacitly considered adequately supplied and available in a typical soil.

Publication metadata

Author(s): Mejeha OK, Head IM, Sherry A, McCann CM, Leary P, Jones DM, Gray ND

Publication type: Article

Publication status: Published

Journal: Chemosphere

Year: 2019

Volume: 237

Print publication date: 08/08/2019

Online publication date: 19/08/2019

Acceptance date: 07/08/2019

Date deposited: 20/08/2019

ISSN (print): 0045-6535

ISSN (electronic): 1879-1298

Publisher: Elseiver


DOI: 10.1016/j.chemosphere.2019.124545


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