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| Screening of psychrophilic denitrification and phosphate-accumulating organism，and the application in culture tail water treatment |
| Received:August 15, 2024 |
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| KeyWord:psychrophilic;denitrifying phosphorus accumulating bacteria;eel culture tail water;total phosphorus;nitrate nitrogen |
| Author Name | Affiliation | E-mail | | HUANG Qiurong | Fisheries College, Jimei University, Xiamen 361021, China
Engineering Research Center of the Modern Technology for Eel Industry, Ministry of Education, Xiamen 361021, China | | | LIU Yong | Fisheries College, Jimei University, Xiamen 361021, China
Engineering Research Center of the Modern Technology for Eel Industry, Ministry of Education, Xiamen 361021, China | | | JIANG Xinglong | Fisheries College, Jimei University, Xiamen 361021, China
Engineering Research Center of the Modern Technology for Eel Industry, Ministry of Education, Xiamen 361021, China | xinlongjiang@jmu.edu.cn | | YANG Ruolan | Fisheries College, Jimei University, Xiamen 361021, China
Engineering Research Center of the Modern Technology for Eel Industry, Ministry of Education, Xiamen 361021, China | |
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| Abstract: |
| To address the challenge of efficient nitrogen and phosphorus removal from culture tail water at low temperatures, we screened psychrotrophic denitrifying polyphosphate-accumulating strains and investigated their application in eel culture tail water. A strain of Acinetobacter junii PL-1, a gamma-hemolytic strain sensitive to most antibiotics, was screened from the substrate of eel ponds by plate culture and 16S rDNA sequence analysis for its function of cold denitrification and polyphosphate removal. A one-way multilevel test was used to investigate the total phosphorus and nitrate nitrogen removal characteristics of the strain. And it was found that：the best nitrogen and phosphorus treatment effect was achieved under the conditions of sodium acetate as the carbon source, water temperature of 15.9 ℃, pH 6.52, with an inoculation of 1.64%, a C/N ratio of 5.19, and oscillation speed of 100 r·min-1. The removal rates of total phosphorus and nitrate nitrogen reached 86.07% and 50.66%, respectively. In the treatment of eel culture tail water, at an average water temperature of 10 ℃ and an hydraulic retention time of 2.1 days, the PL-1 strain achieved removal rates of 76.12% for total phosphorus and 46.50% for nitrate nitrogen. The results demonstrate that the strain possesses effective psychrotrophic denitrification and phosphorus removal capabilities, offering high application value and promising market prospects. |
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