PMID- 20617730
OWN - NLM
STAT- MEDLINE
DCOM- 20100729
LR  - 20190911
IS  - 1001-0742 (Print)
IS  - 1001-0742 (Linking)
VI  - 22
IP  - 4
DP  - 2010
TI  - Effect of substrate COD/N ratio on performance and microbial community structure 
      of a membrane aerated biofilm reactor.
PG  - 540-6
AB  - Two parallel carbon-membrane aerated biofilm reactors were operated at 
      well-defined conditions to investigate the effect of substrate COD/N ratios on 
      the performance and microbial community structure of the bioreactor. Results 
      showed that at substrate COD/N of 5, organic and nitrogen could be eliminated 
      simultaneously, and COD removal degree, nitrification and denitrification 
      efficiency reached 85%, 93% and 92%, respectively. With increasing substrate 
      COD/N ratios, the specific oxygen utilization rates of nitrifying bacteria in 
      biofilm were found to decrease, indicating that nitrifying population became less 
      dominant. At substrate COD/N ratio of 6, excessive heterotrophs inhibited the 
      activity of nitrifying bacteria greatly and thus led to poor nitrification 
      process. With the help of fluorescence in situ hybridization (FISH), Nitrosomonas 
      and Nitrosospira were identified as dominant ammonia-oxidizing bacteria in the 
      biofilm at substrate COD/N of 0, whereas only Nitrosospira were detected in the 
      biofilm at COD/N ratio of 5. Nitrospira were present as dominant 
      nitrite-oxidizing bacteria in our study. Confocal laser scanning microscopy 
      images revealed that at substrate COD/N ratio of 0 nitrifying bacteria existed 
      throughout the biofilm and that at COD/N ratio of 5 they were mainly distributed 
      in the inner layer of biofilm.
FAU - Liu, Huijun
AU  - Liu H
AD  - China Agriculture University, Yantai 264670, China. swm0418@126.com
FAU - Yang, Fenglin
AU  - Yang F
FAU - Shi, Shuyi
AU  - Shi S
FAU - Liu, Xincheng
AU  - Liu X
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - Netherlands
TA  - J Environ Sci (China)
JT  - Journal of environmental sciences (China)
JID - 100967627
RN  - N762921K75 (Nitrogen)
RN  - S88TT14065 (Oxygen)
SB  - IM
MH  - Air
MH  - Bacteria/*metabolism
MH  - Biofilms
MH  - *Bioreactors
MH  - Fluorescence
MH  - Nitrogen/*chemistry/metabolism
MH  - Oxygen/*chemistry/metabolism
MH  - Waste Disposal, Fluid/*methods
EDAT- 2010/07/14 06:00
MHDA- 2010/07/30 06:00
CRDT- 2010/07/13 06:00
PHST- 2010/07/13 06:00 [entrez]
PHST- 2010/07/14 06:00 [pubmed]
PHST- 2010/07/30 06:00 [medline]
AID - 10.1016/s1001-0742(09)60143-1 [doi]
PST - ppublish
SO  - J Environ Sci (China). 2010;22(4):540-6. doi: 10.1016/s1001-0742(09)60143-1.