PMID- 15932786
OWN - NLM
STAT- MEDLINE
DCOM- 20060227
LR  - 20131121
IS  - 0301-4797 (Print)
IS  - 0301-4797 (Linking)
VI  - 76
IP  - 3
DP  - 2005 Aug
TI  - Size-dependent anaerobic digestion rates of flocculated activated sludge: role of 
      intrafloc mass transfer resistance.
PG  - 239-44
AB  - The anaerobic digestion rate for flocculated sludge has been considered to be 
      lower than that of original sludge, particularly in the later stages of 
      digestion; attributed this relatively slower rate to the increased mass transfer 
      resistance for reactants through the large flocs after flocculation. This study 
      confirmed that methane production was retarded by flocculation. The structure of 
      the floc was identified with fluorescence in situ hybridization (FISH) and a 
      confocal laser scanning microscope (CLSM) technique. To verify the mass transfer 
      resistance induced by flocculation, microsensors were applied to assess the 
      response of oxygen concentration distribution inside the flocs that are subjected 
      to sudden changes in ambient oxygen levels. Response time for the electrode at a 
      floc's center was five times greater than the response time in original sludge 
      flocs. Although the effective diffusivity of oxygen in the floc increased by 2.3 
      times after flocculation, the increased size of the flocculated floc was the 
      major contributor to the total mass transfer resistance to oxygen.
FAU - Chu, C P
AU  - Chu CP
AD  - Chemical Engineering Department, National Taiwan University, Taipei 106, Taiwan, 
      ROC.
FAU - Tsai, D G
AU  - Tsai DG
FAU - Lee, D J
AU  - Lee DJ
FAU - Tay, J H
AU  - Tay JH
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - England
TA  - J Environ Manage
JT  - Journal of environmental management
JID - 0401664
RN  - 0 (DNA Primers)
RN  - 0 (Sewage)
RN  - OP0UW79H66 (Methane)
RN  - S88TT14065 (Oxygen)
SB  - IM
MH  - Bacteria, Anaerobic/genetics/*metabolism/ultrastructure
MH  - Biodegradation, Environmental
MH  - *Bioreactors
MH  - DNA Primers
MH  - Flocculation
MH  - In Situ Hybridization, Fluorescence
MH  - Methane/metabolism
MH  - Microscopy, Confocal
MH  - Oxygen/metabolism
MH  - Sewage/*microbiology
MH  - Time Factors
MH  - Waste Disposal, Fluid/*methods
EDAT- 2005/06/04 09:00
MHDA- 2006/02/28 09:00
CRDT- 2005/06/04 09:00
PHST- 2004/05/16 00:00 [received]
PHST- 2004/11/20 00:00 [revised]
PHST- 2005/01/21 00:00 [accepted]
PHST- 2005/06/04 09:00 [pubmed]
PHST- 2006/02/28 09:00 [medline]
PHST- 2005/06/04 09:00 [entrez]
AID - S0301-4797(05)00098-8 [pii]
AID - 10.1016/j.jenvman.2005.01.022 [doi]
PST - ppublish
SO  - J Environ Manage. 2005 Aug;76(3):239-44. doi: 10.1016/j.jenvman.2005.01.022.