Premium
Coexistence of nitrifiers, denitrifiers and Anammox bacteria in a sequencing batch biofilm reactor as revealed by PCR‐DGGE
Author(s) -
Xiao Y.,
Zeng G.M.,
Yang Z.H.,
Liu Y.Sh.,
Ma Y.H.,
Yang L.,
Wang R.J.,
Xu Zh.Y.
Publication year - 2009
Publication title -
journal of applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 1364-5072
DOI - 10.1111/j.1365-2672.2008.04017.x
Subject(s) - temperature gradient gel electrophoresis , anammox , denitrifying bacteria , biofilm , bacteria , microbial population biology , microbiology and biotechnology , 16s ribosomal rna , biology , nitrospira , food science , candidatus , leachate , chemistry , environmental chemistry , denitrification , nitrogen , genetics , organic chemistry
Aims: The bacterial diversity in a sequencing batch biofilm reactor (SBBR) treating landfill leachate was studied to explain the mechanism of nitrogen removal. Methods and Results: The total microbial DNA was extracted from samples collected from landfill leachate and biofilm of the reactor with the removal efficiencies of NH 4 + ‐N higher than 97% and that of chemical oxygen demand (determined by K 2 Cr 2 O 7 , COD Cr ) higher than 86%. Denaturing gradient gel electrophoresis (DGGE) fingerprints based on total community 16S rRNA genes were analyzed with statistical methods, and excised DNA bands were sequenced. The results of phylogenetic analyses revealed high diversity within the SBBR biofilm community, and DGGE banding patterns showed that the community structure in the biofilm remained stable during the running period. Conclusions: A coexistence of nitrifiers, including ammonia‐oxidizing bacteria and nitrite‐oxidizing bacteria, denitrifiers, including aerobic or anaerobic denitrifying bacteria and Anammox bacteria were detected, which might be the real matter of high removal efficiencies of NH 4 + ‐N and COD Cr in the reactor. Significance and Impact of the Study: The findings in this study indicated that PCR‐DGGE analysis could be used for microbial community detection as prior method, and the SBBR technique could provide preferable growing environment for bacteria with N removal function.