Study Of The Extracellular Polymeric Substances
(EPS) In Different Types Of Membrane
Bioreactor (MBR) Effluents
Author(s)
L. D. Chabalina, M. Rodríguez & D. Prats
Abstract
One of the problems involved in operating membrane bioreactors (MBR) is
membrane fouling. This is caused by the presence of wastewater constituents
such as colloids, mineral particles, ionic components, micro-organisms and
basically because of extracellular polymeric substances (EPS). EPS are highmolecular
weight compounds secreted by microorganisms into their
environment, and they are mostly composed of proteins and polysaccharides. An
exhaustive study of EPS concentration is essential to improve MBR operation. In
this paper, a comparative study of the most frequently used EPS extraction
methods has been done: extraction using a cation exchange resin (CER) (Dowex
50X8), using formaldehyde (36.5%) + NaOH 1M and by heating. The best
results were obtained when the CER was used, extracting in almost all
experiments more than double the EPS extracted by the other two techniques.
Additionally, determination of the optimum amount of CER required was carried
out. The obtained value was 70 g CER/g VS. Afterwards, EPS determination of
four different types of effluent using the same method was carried out. The
wastewaters used were the following: a) young age sludge coming from an ice
cream factory; mixed liquor from the municipal wastewater plant \“Rincón de
León”, Alicante; mixed liquor obtained from the pilot membrane bioreactor of
\“Rincón de León”, Alicante; mixed liquor obtained from a full scale MBR plant.
Keywords: extracellular polymeric substances (EPS), EPS extraction method,
membrane fouling, MBR effluent.
1 Introduction
The implementation of membrane bioreactor (MBR) in wastewater treatment
offers many advantages over traditional activated sludge treatment. However,
Keywords
extracellular polymeric substances (EPS), EPS extraction method,
membrane fouling, MBR effluent.
Related Book
Other papers in this volume
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