Characterizations of microbial diversity and machine oil degrading microbes in machine oil contaminated soil

• Published in: Environmental pollution (1987) Vol. 255; no. Pt 1; p. 113190
• Main Authors: Wang, Mengjiao, Deng, Baiwan, Fu, Xun, Sun, Haiyan, Xu, Zhimin
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.12.2019
• Subjects: Bacteroidetes - classification; Bacteroidetes - isolation & purification; Bacteroidetes - metabolism; Biodegradation, Environmental; Carbon - analysis; Contamination; Degradation; Lubricants - analysis; Machine oil; Microbes; Nitrogen - analysis; Oils - analysis; Petroleum; Petroleum - analysis; Pollution; Proteobacteria - classification; Proteobacteria - isolation & purification; Proteobacteria - metabolism; Soil - chemistry; Soil Microbiology; Soil Pollutants - analysis; Degradation; Machine oil; Pollution; Microbes; Contamination; Petroleum
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2019.113190

Microbial diversity in machine oil contaminated soil was determined by high-throughput amplicon sequencing technology. The diversity of culturable microbes in the contaminated soil was further characterized using polymerase chain reaction method. Proteobacteria and Bacteroidetes were the most dominant phyla and occupied 52.73 and 16.77%, respectively, while the most abundant genera were Methylotenera (21.62%) and Flavobacterium (3.06%) in the soil. In the culturable microbes, the major phyla were Firmicutes (46.15%) and Proteobacteria (37.36%) and the most abundant genera were Bacillus (42.86%) and Aeromonas (34.07%). Four isolated microbes with high machine oil degradation efficiency were selected to evaluate their characteristics on the oil degradation. All of them reached their highest oil degradation rate after 7 days of incubation. Most of them significantly increased their oil degradation rate by additional carbon or organic nitrogen source in the incubation medium. The oil degradation rate by combination of the four microbes at the same inoculation level was also higher than the rate from each individual microbe. The protocol and findings of this study are very useful for developing micro-bioremediation method to eliminate machine oil contaminants from soil. [Display omitted] •Diversities of microbes and culturable microbes in machine oil polluted soil were studied.•Four microbes with high machine oil degradation efficiency were isolated and evaluated.•Their combination or additional carbon and nitrogen sources increased oil degradation rate.•The findings offer a high efficiency bioremediation way to eliminate machine oil in soil.