Journal
BIORESOURCE TECHNOLOGY
Volume 322, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124555
Keywords
Nitrogen removal; Pseudomonas; Heterotrophic nitrification-aerobic denitrification; napA; Immobilized carrier
Funding
- National Natural Science Foundation of China [41877344, 41925031, Y85Z021301, Y951040101]
- Chinese Academy of Sciences, State Key Laboratory of Freshwater Ecology and Biotechnology [2019FBZ03]
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Pseudomonas sp. DM02 demonstrates efficient nitrogen removal capabilities in aquaculture wastewater treatment, with quick removal of total ammonia nitrogen and nitrates. Optimal environmental conditions and the presence of functional genes play a crucial role in water quality treatment.
A bacterial strain was isolated and identified as Pseudomonas sp. DM02 from an aquaculture system. Strain DM02 showed efficient heterotrophic nitrification-aerobic denitrification capability. Total ammonia nitrogen (TAN, 10 mg/L) could be completely removed by strain DM02 within 12 h under low nutrient condition. Nitrogen mass balance indicated that 70.8% of the initial TAN was translated into gaseous nitrogen and 28.1% was converted into intracellular nitrogen. Various carbon sources can be used for nitrate removal (>95% within 28 h). The optimal conditions for TAN, nitrate and nitrite removal were pH 7 with carbon/nitrogen (C/N) ratios of 8, 12 and 12, respectively. The napA, nirK, and nosZ functional genes were successful amplified from strain DM02. Both bioaugmentation and immobilized technology of strain DM02 present ability (>88%) for continuous treatment of real aquaculture wastewater. This research indicated a great potential for practical application of Pseudomonas sp. DM02 in aquaculture wastewater treatment.
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