Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 23, Issue 11, Pages 1880-1887Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(10)60621-3
Keywords
bulking sludge; cultivable bacteria; rep-PCR; 16S rRNA gene clone library
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Funding
- Chinese Academy of Sciences [KZCX2-YW-JC407-3, KSCX2-YW-G-054-2]
- Ministry of Science and Technology, China [2006DFA91870]
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The bacterial community of a bulking sludge from a municipal wastewater treatment plant with anoxic-anaerobic-oxic process was investigated by combination of cultivation and 16S rRNA gene clone library analysis for understanding the causes of bulking. A total of 28 species were obtained from 63 isolates collected from six culture media. The most cultivable species belonged to gamma-Proteobacteria including Klebsiella sp., Pseudomonas sp., Aeromonas sp. and Acinetobacter sp. Further analysis of these strains by repetitive sequence based on polymerase chain reaction (rep-PCR) technology showed that rep-PCR yielded discriminatory banding patterns within the same genus using REP and BOX primer sets. While the culture-independent assessment revealed that beta-Proteobacteria was the dominant group in the bulking sample. Sequence analysis revealed that the highest proportion (14.7%) of operational taxonomic units was 98% similar to Candidatus Accumulibacter phosphatis, which is used to remove phosphorous from wastewater. Our results indicated that combining different approaches can produce complementary information, thus generate a more accurate view of microbial community in bulking sludge.
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