Journal
BIORESOURCE TECHNOLOGY
Volume 101, Issue 8, Pages 2700-2705Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.11.085
Keywords
Anammox; Biomass growth; Specific activity; Nitrogen loading rate
Funding
- Hi-Tech Research and Development PROGRAM of China [2006AA06Z332]
- National Natural Science Foundation of China [30770039]
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The anaerobic ammonium oxidation (Anammox) was successfully started up in an upflow biofilm (UBF) reactor and operated for 435 days at 35 degrees C. The process development could be divided into four phases, i.e. endogenous denitrification without Anammox reaction (PI), functional biomass enrichment under relatively low nitrogen loading rate (NLR) (P2), specific Anammox activity (SAA) enhancement with high NLR (P3) and the final stable stage (P4). The maximal NLR was as high as 34.5 kg N/m(3)d. Nitrogen mass balance showed that 88.84% of input nitrogen converted to dinitrogen gas, 1.74% was used for cellular synthesis and the rest was converted to nitrate. The final produced biomass was fast-growing with SAA of 1.8 g N/gVSS d and doubling time of 4.3-7.4 d. Granulation and biofilm formation contributed to the biomass enrichment, while appropriate recirculation as well as relatively high temperature (35 degrees C) helped to promote SAA. Effective retention time and promoted sludge activity were considered as the key factors for bacterial growth and efficient Anammox process. (C) 2009 Published by Elsevier Ltd.
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