Optimization of aquaculture wastewater treatment systems: based on the isolation of the strain Acinetobacter sp. LF10.

Abstract

A highly efficient denitrifying bacterial strain (Acinetobacter sp. LF10) was isolated in this study, strain LF10 efficiently removed ammonium (98.02 ± 0.43 %), nitrate (90.35 ± 1.68 %), and nitrite (86.84 ± 2.41 %) from aquatic systems through coordinated assimilatory and dissimilatory nitrate reduction pathways coupled with ammonium assimilation. Compared with the traditional denitrification process, strain LF10 has the potential to reduce greenhouse gas (N₂O) emissions. Strain LF10 not only has strong temperature adaptability (15-35 ℃), but also has the advantage of maintaining a high ammonia nitrogen removal rate under low C/N conditions. Strain LF10 has demonstrated great potential in the treatment of aquaculture wastewater. LF10 can maintain strong competitiveness in biofilters and significantly enhance the nitrogen removal performance of biofilters under normal temperature (31.0 ± 2.4 ℃) and low temperature (15.0 ± 0.3 ℃) conditions. The average total nitrogen removal rates were 94.67 ± 0.64 % and 84.72 ± 17.03 %, respectively. These attributes position LF10 as a highly promising candidate for nitrogen removal in aquaculture wastewater treatment, offering considerable potential for the resource utilization of wastewater in sustainable aquaculture practices.