Removal of Nitrogen and Phosphorus by a Novel Salt-Tolerant Strain Pseudomonas sediminis D4
文献类型： 外文期刊
作者： Liu, Yuting 2 ; Yin, Peng 1 ; Zhou, Jiayi 2 ; Ma, Yonghao 2 ; Lai, Xunheng 2 ; Lin, Junduo 2 ; Peng, Huilin 2 ; Shu, Hu 2 ; Huang, Wen 1 ;
作者机构： 1.Guangdong Acad Agr Sci, Inst Anim Sci, Collaborat Innovat Ctr Aquat Sci, Guangdong Key Lab Anim Breeding & Nutr, Guangzhou 510640, Peoples R China
2.Guangzhou Univ, Sch Life Sci, Guangzhou 510006, Peoples R China
3.Shenzhen Univ, Med Sch, Shenzhen 518037, Peoples R China
关键词：
brackish water; simultaneous nitrogen and phosphorus removal; heterotrophic nitrification-aerobic denitrification;
期刊名称：WATER （ 影响因子：3.0； 五年影响因子：3.3 ）
ISSN：
年卷期： 2025 年 17 卷 4 期
页码：
收录情况： SCI
摘要： Managing nitrogen and phosphorus pollution in high-salinity wastewater is a critical challenge for sustainable aquaculture and environmental protection. In this study, a novel salt-tolerant strain, Pseudomonas sediminis D4, was isolated from a brackish water environment. This strain exhibited simultaneous heterotrophic nitrification-aerobic denitrification and phosphorus removal capabilities. Biosafety assays demonstrated that the strain was antibiotic-sensitive and safe for aquatic environments. The optimal conditions for nitrogen and phosphate removal of strain D4 were carbon/nitrogen (C/N) ratio 10, phosphorus/nitrogen (P/N) ratio 0.2, pH 7, and temperature 30 degrees C while using sodium succinate as the carbon source. Under these conditions, strain D4 achieved removal efficiencies of 97.36% for ammonia (NH4+-N), 100.00% for nitrate (NO3--N), and 98.02% for nitrite (NO2--N), along with 94.69%, 89.56%, and 97.40% removal of PO43-P, respectively. The strain exhibited strong salinity tolerance, functioning effectively within a range of 0% to 5% (w/v), and maintaining high nitrogen and phosphorus removal efficiency at a salinity of 3%. Enzyme activity assays verified the existence of key enzymes, such as ammonia nitrogen oxidase, nitrate oxidoreductase, nitrate reductase, nitrite reductase, polyphosphate kinase, and exopolyphosphatase, which are essential for the heterotrophic nitrification-aerobic denitrification and phosphorus removal capabilities of D4. These findings highlight the potential of Pseudomonas sediminis D4 for the biological treatment of high-salinity wastewater.
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