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Chen L, Chen L, Pan D, Lin H, Ren Y, Zhang J, Zhou B, Lin J, Lin J. Heterotrophic nitrification and related functional gene expression characteristics of Alcaligenes faecalis SDU20 with the potential use in swine wastewater treatment. Bioprocess Biosyst Eng 2021; 44:2035-2050. [PMID: 33978835 DOI: 10.1007/s00449-021-02581-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 04/30/2021] [Indexed: 11/24/2022]
Abstract
A new heterotrophic nitrifying bacterium was isolated from the compost of swine manure and rice husk and identified as Alcaligenes faecalis SDU20. Strain SDU20 had heterotrophic nitrification potential and could remove 99.7% of the initial NH4+-N. Nitrogen balance analysis revealed that 15.9 and 12.3% of the NH4+-N were converted into biological nitrogen and nitrate nitrogen, respectively. The remaining 71.44% could be converted into N2 or N2O. Single-factor experiments showed that the optimal conditions for ammonium removal were the carbon source of sodium succinate, C/N ratio 10, initial pH 8.0, and temperature 30 °C. Nitrification genes were determined to be upregulated when sodium succinate was used as the carbon source analyzed by quantitative real-time polymerase chain reaction (qRT-PCR). Strain SDU20 could tolerate 4% salinity and show resistance to some heavy metal ions. Strain SDU20 removed 72.6% high concentrated NH4+-N of 2000 mg/L within 216 h. In a batch experiment, the highest NH4+-N removal efficiency of 98.7% and COD removal efficiency of 93.7% were obtained in the treatment of unsterilized swine wastewater. Strain SDU20 is promising in high-ammonium wastewater treatment.
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Affiliation(s)
- Lifei Chen
- State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Qingdao, 266237, People's Republic of China
| | - Linxu Chen
- State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Qingdao, 266237, People's Republic of China
| | - Deng Pan
- Shandong Engineering Laboratory of Treatment and Resource Utilization of Waste From Planting and Breeding Industry, Shandong Yian Bioengineering Co., Ltd, Jinan, 250014, People's Republic of China
| | - Huibin Lin
- Shandong Academy of Chinese Medicine, Jinan, 250014, People's Republic of China
| | - Yilin Ren
- Qingdao Longding Biotech Co., Ltd, Qingdao, 266109, People's Republic of China
| | - Juan Zhang
- Shandong Institute for Product Quality Inspection, Jinan, 250102, People's Republic of China
| | - Bo Zhou
- College of Life Sciences, Shandong Agricultural University, Taian, 271018, People's Republic of China
| | - Jianqun Lin
- State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Qingdao, 266237, People's Republic of China.
| | - Jianqiang Lin
- State Key Laboratory of Microbial Technology, Microbial Technology Institute, Shandong University, Qingdao, 266237, People's Republic of China.
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