Abstract
A high-efficient heterotrophic nitrifying bacterial strain named Ni3-1 was isolated from sewage ditches. Based on morphological observation and 16S rDNA sequence analysis,strain Ni3-1 was identified as Alcaligenes faecalis. NH + 4 - N removal characteristics of strain Ni3-1 was then analyzed. Results showed that heterotrophic nitrification by the strain Ni3-1 occurred mainly during its logarithmic growth phase. Carbon source had an obviously effect on NH+ 4 -N removal efficiency, and trisodium citrate and sodium succinate were the most appropriate ones. The strain exhibited appreciable heterotrophic nitrification activity when the NH+ 4 -N concentration was in the range of 10 ~ 1 000 mg /L. Strain Ni3-1 was active over a wide range of temperatures ( 25 ~ 35 ℃) ,pH values ( 6 ~ 9) and C/N ratios ( 10 ~ 25) ,and more than 95% of NH + 4 -N could be removed within 24 h under these conditions. Above all,this strain worked well when applied for pig wastewater treatment,and the NH + 4 -N removal ratio reached 93. 2% within 48 h. Neither of NO - 2 -N nor NO - 3 -N was detected in the treatment process. Heterotrophic nitrifier Alcaligenes faecalis Ni3-1 had high efficiency in NH+ 4 - N removal and had potential for treating wastewater with a high NH+ 4 -N load.
References
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