PMID- 17184812
OWN - NLM
STAT- MEDLINE
DCOM- 20070416
LR  - 20070115
IS  - 0043-1354 (Print)
IS  - 0043-1354 (Linking)
VI  - 41
IP  - 3
DP  - 2007 Feb
TI  - Dynamics of drinking water biofilm in flow/non-flow conditions.
PG  - 551-62
AB  - Drinking water biofilm formation on polyvinyl chloride (PVC), cross-linked 
      polyethylene (PEX), high density polyethylene (HDPE) and polypropylene (PP) was 
      followed in three different reactors operating under stagnant or continuous flow 
      regimes. After one week, a quasi-steady state was achieved where biofilm total 
      cell numbers per unit surface area were not affected by fluctuations in the 
      concentration of suspended cells. Metabolically active cells in biofilms were 
      around 17-35% of the total cells and 6-18% were able to form colony units in 
      R(2)A medium. Microbiological analysis showed that the adhesion material and 
      reactor design did not affect significantly the biofilm growth. However, 
      operating under continuous flow (0.8-1.9 Pa) or stagnant water had a significant 
      effect on biofilm formation: in stagnant waters, biofilm grew to a less extent. 
      By applying mass balances and an asymptotic biofilm formation model to data from 
      biofilms grown on PVC and HDPE surfaces under turbulent flow, specific growth 
      rates of bacteria in the biofilm were found to be similar for both materials 
      (around 0.15 day(-1)) and much lower than the specific growth rates of suspended 
      bacteria (around 1.8 day(-1)).
FAU - Manuel, C M
AU  - Manuel CM
AD  - LEPAE, Department of Chemical Engineering, Faculty of Engineering, University of 
      Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
FAU - Nunes, O C
AU  - Nunes OC
FAU - Melo, L F
AU  - Melo LF
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20061220
PL  - England
TA  - Water Res
JT  - Water research
JID - 0105072
RN  - 0 (Polypropylenes)
RN  - 9002-86-2 (Polyvinyl Chloride)
RN  - 9002-88-4 (Polyethylene)
SB  - IM
MH  - Biofilms/*growth & development
MH  - Bioreactors/microbiology
MH  - Colony Count, Microbial
MH  - Kinetics
MH  - Polyethylene
MH  - Polypropylenes
MH  - Polyvinyl Chloride
MH  - *Water Movements
MH  - Water Supply/*analysis
EDAT- 2006/12/23 09:00
MHDA- 2007/04/17 09:00
CRDT- 2006/12/23 09:00
PHST- 2005/10/25 00:00 [received]
PHST- 2006/10/25 00:00 [revised]
PHST- 2006/11/06 00:00 [accepted]
PHST- 2006/12/23 09:00 [pubmed]
PHST- 2007/04/17 09:00 [medline]
PHST- 2006/12/23 09:00 [entrez]
AID - S0043-1354(06)00623-3 [pii]
AID - 10.1016/j.watres.2006.11.007 [doi]
PST - ppublish
SO  - Water Res. 2007 Feb;41(3):551-62. doi: 10.1016/j.watres.2006.11.007. Epub 2006 
      Dec 20.