Resumo

ESTRADA-ARRIAGA, Edson Baltazar; MIJAYLOVA NACHEVA, Petia  e  GARCIA-SANCHEZ, Liliana. Effect of Mixed Liquor Volatile Suspended Solids on Membrane Fouling During Short and long-term Operation of Membrane Bioreactor. ing.cienc. [online]. 2015, vol.11, n.21, pp.137-155. ISSN 1794-9165.  https://doi.org/10.17230/ingciencia.11.21.7.

The aim of this study was to examine the impact of different Mixed Liquor Volatile Suspended Solids (MLVSS) concentrations on membrane fouling, in a submerged Membrane Bioreactor (MBR) at short and long-term MBR operation for wastewater treatment. Three laboratory-scale in a submerged MBR system were operated under critical flux, sub-critical flux, and an intermittent suction time and backwashing conditions. At short-term MBR operation with mixed liquors of 4,200 and 6,150 mg MLVSS L⁻¹, the hydraulic resistance of membranes followed a same trajectory with averages of 5.0E+12 m⁻¹, whereas for 7,940 mg MLVSS L⁻¹, a high resistance of up to 1.7E+13 m⁻¹ was obtained. The result showed that high biomass concentrations decreased to permeability due to a bio-layer formed in the membrane surface and high Extracellular Polymeric Substance (EPS).

Palavras-chave : membrane bioreactor; membrane fouling; volatile suspended solid; extracellular polymeric substances.

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