Journal
WATER SCIENCE AND TECHNOLOGY
Volume 78, Issue 12, Pages 2626-2638Publisher
IWA PUBLISHING
DOI: 10.2166/wst.2019.025
Keywords
hydrocarbons-degrading bacteria; isolation; oily wastewater; treatment
Funding
- Training Program for Innovative Research Team in Tianjin Institutions of Higher Education [TD13-5021]
- National Natural Science Foundation of China [21677065]
- Special Fund for Basic Scientific Research of Central Public Research Institutes [TKS160113]
- International Science & Technology Cooperation Program of China [2015DFA90250]
- Science and Technology Development Foundation of Universities of Tianjin [20110904]
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The aim of this study was to isolate hydrocarbons-degrading bacteria for treatment of oily wastewater from long-standing petroleum-polluted sediments in Bohai Bay, China. Six hydrocarbons-degrading bacteria were screened and identified as Pseudomonas sp. and Bacillus sp. A new approach using a combination of various bacterial species in petroleum biodegradation was proposed and evaluated for its degradation characteristics. Gas chromatography-flame ionization detection (GC-FID) analysis showed that mixed bacterial agents (YJ01) degraded 80.64% of crude oil and 76.30% of crude oil alkanes, exhibiting good biodegradation effect. Besides, after 14 days of culture, the biodegradation assessment markers, pristane and phytane, showed significant degradation rates of 46.75% and 78.23%, respectively. Kinetic analysis indicated that the degradation trends followed a single first-order kinetics model and the degradation half-life (t(1/2)) of 15 g/L crude oil was significantly shorter (5.48 days). These results indicated that YJ01 could degrade a wider range of hydrocarbons as well as some recalcitrant hydrocarbon components, and can be applied for bioremediation and treatment of oil-contaminated environment.
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