Activity of immobilized and suspended thiobacilli—monitoring immobilization kinetics

Plas, Christian; Holubar, P.; Braun, Rudolf

doi:10.1016/0927-7765(94)80023-5

Cited by 1 publication

(1 citation statement)

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“…Authors studying wastewaters and industrial waters are divided between those who defend that the activity of sessile and planktonic bacteria is similar (Bakke et al, 1984;Characklis and Marshall, 1990) and those who reached opposite conclusions (Plas et al, 1994;Le Magrex et al, 1994). Quantitative data on bacterial growth kinetics in drinking water systems is scarce (Pedersen, 1990;Block et al, 1993;Boe-Hansen et al, 2002b), although such data would seem important for the proper design of distribution networks and reservoirs.…”

Section: Article In Pressmentioning

confidence: 99%

Dynamics of drinking water biofilm in flow/non-flow conditions

2007

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A B S T R A C TDrinking 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 À1) and much lower than the specific growth rates of suspended bacteria (around 1.8 day À1 ).

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