Solid inoculants as a practice for bioaugmentation to enhance bioremediation of hydrocarbon contaminated areas. (January 2021)

• Record Type: Journal Article
• Authors: Li, Haoshuai; Li, Yang; Bao, Mutai; Li, Shudong
• Is Part Of: Chemosphere. Volume 263(2021)
• Publication Date: 2021-01
• Subjects: Biodegradation -- Protective agents -- Crude oil -- Vacuum freeze-drying -- Marine oil spill; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.128175
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Vacuum freeze-drying is a scientifically advanced method to prepare solid inoculants from oil degrading bacterium. The introduction of oil-degrading microbes or bioaugmentation can be an efficient way to bioremediate oil spills in marine areas, where oil-degrading bacteria are deficient. The purpose of this study is to evaluate the potential use of solid inoculants of LZ-2 bacteria to enhance the degradation rate of crude oil. In this study, response surface methodology (RSM) was incorporated into the experimental design to optimize a response, which is influenced by different protectants. Our results showed that five factors have interactive and synergistic protective effects on the growth of LZ-2. Optimal growth of freeze-dried LZ-2 (63.8%) was observed with a 10.5% solution of skim milk supplemented with 14.3% sucrose, 14.4% of trehalose, 4.9% of glycerin and 14.7% of β-cyclodextrin. The culture grew in medium containing crude oil (3 g L −1 ) at 37 °C at 150 rpm for 30 d, GC and GC-MS analysis showed biodegradation of 44.2 and 21.6% for total saturate and aromatic hydrocarbons respectively. These results indicated that the solid inoculants of LZ-2 bacteria had the potential to be used for ex-situ bioremediation of hydrocarbon pollutants associated with crude oil. Graphical abstract: Image 1 Highlights: The potential use of solid inoculants of LZ-2 bacteria to enhance oil biodegradation was evaluated. Response surface methodology was incorporated to demonstrate five factors protective effects. Optimal growth of freeze-dried LZ-2 (63.8%) was observed with optimal compound protectant. The culture grew in medium containing crude oil (3 g L −1 ) at 37 °C at 150 rpm for 30 days were carried out. GC and GC-MS showed biodegradation of 44.2 and 21.6% for total saturate and aromatic hydrocarbons.