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Chemical cleaning of membranes from an anaerobic membrane bioreactor treating food industry wastewater

Ramos, C. ; Zecchino, F. ; Ezquerra, D. ; Diez, V.

Journal of membrane science, 2014-05, Vol.458, p.179-188 [Periódico revisado por pares]

Amsterdam: Elsevier B.V

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  • Título:
    Chemical cleaning of membranes from an anaerobic membrane bioreactor treating food industry wastewater
  • Autor: Ramos, C. ; Zecchino, F. ; Ezquerra, D. ; Diez, V.
  • Assuntos: AnMBR ; Applied sciences ; Chemical cleaning in air ; Chemically enhanced backwash ; Chemistry ; Colloidal state and disperse state ; Exact sciences and technology ; Exchange resins and membranes ; Forms of application and semi-finished materials ; General and physical chemistry ; Membranes ; Oil and grease ; Polymer industry, paints, wood ; Submerged chemical cleaning ; Technology of polymers
  • É parte de: Journal of membrane science, 2014-05, Vol.458, p.179-188
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Different chemical cleaning methods were applied to hollow-fiber membranes from an anaerobic membrane bioreactor (AnMBR) treating wastewater with a high oil and grease content. Chemical cleaning methods were assayed in a pilot-scale AnMBR and on single fouled fibers. The effectiveness of the cleaning processes was determined on the basis of overall resistance due to external irreversible fouling and pore-blocking, and from backwash resistance, solely due to pore-blocking. Concentrations of between 500 and 2000ppm of NaClO, and volumes per unit of membrane area of between 3 and 17.5L/m2 were employed. Chemically enhanced backwash (CEB) achieved an overall cleaning efficiency of up to 60% by backflushing in situ 6L/m2 of 2000ppm. Chemical cleaning in air (CIA) that could be performed in situ reached a cleaning efficiency of up to 80% by employing 10L/m2 of 1000ppm NaClO solution. The best results were obtained with dynamic submerged chemical cleaning (SCC) performed out of place in which filtration and backwashing fluxes pass the cleaning solution through the membrane. Non-uniform fouling on the module produced significant reductions in the cleaning efficiency of the backflux-driven chemical methods. •Different types of chemical cleaning on membrane modules are compared.•Differences in cleaning efficiencies on whole module and single fibers are shown.•Heterogeneous fouling distribution reduces the efficiency of backwash-based methods.•Chemically enhanced backwash removes efficiently the internal fouling resistance.•Chemical cleaning in air is suitable for pore blocking and external fouling removal.
  • Editor: Amsterdam: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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