Affiliations: Department of Environmental Engineering, Ocean
University of China, Qingdao 266003, China | Department of Environmental Engineering, Qingdao
Technological University, Qingdao 266033, China
Abstract: Different kinds of mineral nutrients (NO_3-N,
NH_4-N and PO_4-P) were applied in the
simulated oil-polluted seawater for enhancing oil biodegradation in the N/P
ratio 10:1 and 20: 1. Although indigenous microorganisms have the ability to
degrade oil, adding nutrients accelerated biodegradation rates significantly.
For the group amended with NO_3-N and
PO_4-P in the ratio 10:1, the reaction rate coefficient was
4 times higher than the natural biodegradation. Chemical and microbiological
analysis showed that the optimal N/P ratio in the system is 10:1, and
microorganisms tend to utilize nitrate rather than ammonium as N source.
Keywords: oil spill, biodegradation kinetics, N/P ratio, microbial population