In situ microbial remediation of crude oil-soaked marine sediments using zeolite carrier with a polymer coating. Issue 1 (April 2018)

• Record Type: Journal Article
• Authors: Zhao, Guoqiang; Sheng, Yanqing; Wang, Chuanyuan; Yang, Jian; Wang, Qiaoning; Chen, Lingxin
• Is Part Of: Marine pollution bulletin. Volume 129:Issue 1(2018)
• Page Start: 172
• Page End: 178
• Publication Date: 2018-04
• Subjects: Poly-γ glutamic acid -- Zeolite -- Bacterial agents -- Oil bioremediation -- Marine sediments; Marine pollution -- Periodicals; Marine Biology -- Periodicals; Water Pollution -- Periodicals; Mer -- Pollution -- Périodiques; Publications périodiques; Pollution des mers; Lutte antipollution; Electronic journals; 363.7394
• DOI: 10.1016/j.marpolbul.2018.02.030
• Languages: English
• ISSNs: 0025-326X

Abstract

Abstract: Marine oil spill pollution is an important environmental problem in the world, especially crude oil-soaked marine sediments, because they are difficult to be remediated. In this study, in situ bioremediation of oil-soaked sediment was performed in the middle of the Bohai Sea. Oil-degrading bacteria were adsorbed on powdery zeolite (PZ)/granular zeolites (GZ) surfaces and then wrapped with poly-γ glutamic acid (γ-PGA). Settling column and wave flume experiments were conducted to model marine conditions and to select appropriate biological reagents. The optimal conditions were as follows: the average diameter of GZ 3 mm, mass ratio of GZ/PZ 2:1, and concentration of γ-PGA 7%. After bioremediation, over 50% of most oil-spilled pollutants n -alkanes (C12 to C27 ) and polycyclic aromatic hydrocarbons were degraded in 70 days. This work resulted in a successful trial of in situ bioremediation of oil-soaked marine sediments. Graphical abstract: Highlights: Bacterial agents, zeolite and poly glutamic acid were applied in marine sediment remediation. Coated zeolite decreased the loss of effective bacteria during the delivery process. Over 50% of crude oil-spilled pollutants were degraded in 70 days.