Effect of Mixed Liquor Volatile Suspended Solids on Membrane Fouling During Short and long-term Operation of Membrane Bioreactor

Main Article Content

Edson Baltazar Estrada-Arriaga
Petia Mijaylova Nacheva https://orcid.org/0000-0002-7414-2728
Liliana García-Sánchez https://orcid.org/0000-0002-1143-3640

Keywords

membrane bioreactor, membrane fouling, volatile suspended solid, extracellular polymeric substances

Abstract

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 shortterm 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).

PACS: 87.18.-h, 92.40.kc, 87.16.dj, 92.40.Qk, 47.63.-b

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