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Isolation of a New Aerobic Denitrifying Bacterium and Its Denitrification Characteristics

Shangying Xu, Hua Zhang, Li Na, Feng Li, Junzhong Yang, Yongliang Zheng, Deli Liu

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Abstract

A bacterial strain HS-N2 was isolated from a textile mill in Hubei Province.Results showed that HS-N2 was capable of denitrification under aerobic condition and facultative anaerobic condition.Nitrate of 10mmol/L could be efficiently removed by strain HS-N2 and the nitrogen removal rate was above 95% at 30℃ for 24h culture.Factors that affecting anaerobic denitrification by strain HS-N2 were determined.Results indicated that the most optimum temperature and pH value for aerobic denitrification were at 30℃ and 7.0 respectively.According to morphological characteristics,physiological biochemical test and sequence analysis of 16S rDNA,strain HS-N2 was identified as Salmonella Lignieres.

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What this paper is about

A bacterial strain HS-N2 was isolated from a textile mill in Hubei Province.Results showed that HS-N2 was capable of denitrification under aerobic condition and facultative anaerobic condition.Nitrate of 10mmol/L could be efficiently removed by strain HS-N2 and the nitrogen removal rate was above 95% at 30℃ for 24h culture.Factors that affecting anaerobic denitrification by strain HS-N2 were determined.Results indicated that the most optimum temperature and pH value for aerobic denitrification were at 30℃ and 7.0 respectively.According to morphological characteristics,physiological biochemical test and sequence analysis of 16S rDNA,strain HS-N2 was identified as Salmonella Lignieres.

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Available abstract

A bacterial strain HS-N2 was isolated from a textile mill in Hubei Province.Results showed that HS-N2 was capable of denitrification under aerobic condition and facultative anaerobic condition.Nitrate of 10mmol/L could be efficiently removed by strain HS-N2 and the nitrogen removal rate was above 95% at 30℃ for 24h culture.Factors that affecting anaerobic denitrification by strain HS-N2 were determined.Results indicated that the most optimum temperature and pH value for aerobic denitrification were at 30℃ and 7.0 respectively.According to morphological characteristics,physiological biochemical test and sequence analysis of 16S rDNA,strain HS-N2 was identified as Salmonella Lignieres.

Key concepts: Denitrifying bacteria, Denitrification, Aerobic denitrification, Facultative, Anaerobic exercise, Strain (injury), Nitrate, Bacteria

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