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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2007

Autores

C.M. Manuel (Autor) Outra; O. C. Nunes (Autor) FEUP; L. F. Melo (Autor) FEUP

Revista

Título: Water Research

Vol. 41 Nº 3

Páginas: 551-562

ISSN: 0043-1354

Editora: Elsevier

Indexação

ISI Web of Knowledge - 90 Citações

ISI Web of Science

Scopus - 109 Citações

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia do ambiente

CORDIS: Ciências Tecnológicas

Outras Informações

ID Authenticus: P-004-C6D

DOI: 10.1016/j.watres.2006.11.007

Abstract (EN): 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)).

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12