Isolation and identification of a heterotrophic nitrification strain Alcaligenes sp.XN-1 and its degradation characteristics analysis
To increase the biological nitrogen removal efficiency of these saline wastewater,a heterotrophic nitrification bacterium was enriched and isolated from industrial wastewater sludge.The strain was characterized by Gram staining and molecular biology.The 16S rRNA gene sequencing results were analyzed in Blast database for homology and a phylogenetic tree was constructed.The effects of carbon source type,different C/N,initial pH,temperature and NaCl concentration on the denitrification effect of the strain were stud-ied.The results showed that the isolated heterotrophic nitrobacteria strain was Alcaligenes sp.,named XN-1.Both the maximum NH4-N removal rate and the maximum cell growth were obtained under sodium acetate with the values of 100％and 0.42,respectively When C/N 15-20,with initial pH 7-10,temperature at 30-35 ℃,and salinity in the rang of 0-4％,the highest ammonia nitrogen removal rate of 100％was obtained.Strain XN-1 had highly efficient heterotrophic nitrification ability and great potential in nitrogen removal treatment of saline wastewater.
heterotrophic nitrificationammonia nitrogen degradationisolation and identificationhigh salt
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