Influence of microbial community structure of seed sludge on the properties of aerobic nitrifying granules
Lixin Li , Qiuxu Wang , Ting Li , Yu Pan , Zhiwei Song
DOI:10.1016/j.jes.2015.01.033
Received November 06, 2014,Revised January 08, 2015, Accepted January 16, 2015, Available online July 07, 2015
Volume 35,2015,Pages 144-150
In order to evaluate the influence of microbial community structure of seed sludge on the properties of aerobic nitrifying granules, these granules were cultivated with different seed sludge, and the variation of microbial community and dominant bacterial groups that impact the nitrogen removal efficiency of the aerobic nitrifying granules were analyzed and identified using 16s rDNA sequence and denaturing gradient gel electrophoresis (DGGE) profiles. The results presented here demonstrated that the influence of the community structure of seed sludge on the properties of aerobic nitrifying granules was remarkable, and the granules cultivated by activated sludge from a beer wastewater treatment plant showed better performance, with a stable sludge volume index (SVI) value of 20 mL/g, high extracellular polymeric substance (EPS) content of 183.3 mg/L, high NH4+-N removal rate of 89.42% and abundant microbial population with 10 dominant bacterial groups. This indicated that activated sludge with abundant communities is suitable for use as seed sludge in culturing aerobic nitrifying granules.
