Internal versus external submerged membrane bioreactor configurations for dairy wastewater treatment

Two submerged membrane bioreactor (SMBR) configurations, one with the membrane module internal (SMBRi) and the other one external (SMBRe) to the biological tank, were used for the treatment of dairy industry effluent and evaluated in terms of pollutant removal capacity and fouling, focusing on the p...

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Bibliographic Details
Published in:	Desalination and water treatment Vol. 52; no. 16-18; pp. 2920 - 2932
Main Authors:	Andrade, Laura Hamdan de, Mendes, Flávia Daniele dos Santos, Espindola, Jonathan Cawettiere, Amaral, Míriam Cristina Santos
Format:	Journal Article
Language:	English
Published:	Elsevier Inc 01-04-2014
Subjects:	Bioreactors Cellular Dairy wastewater EPS Extracellular polymeric substances (EPS) Fouling Membranes Oxygen demand Pumps Soluble microbial products (SMP) Submerged Submerged membrane bioreactor (SMBR) configuration Soluble microbial products (SMP) Submerged membrane bioreactor (SMBR) configuration Dairy wastewater Fouling Extracellular polymeric substances (EPS)
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Summary:	Two submerged membrane bioreactor (SMBR) configurations, one with the membrane module internal (SMBRi) and the other one external (SMBRe) to the biological tank, were used for the treatment of dairy industry effluent and evaluated in terms of pollutant removal capacity and fouling, focusing on the production of soluble microbial products (SMP) and extracellular polymeric substances (EPS). Both the MBRs presented excellent chemical oxygen demand (COD) removal efficiency (98% average), color (98%), and nutrients (86% for total nitrogen and 86–89% for total phosphorus); however, it was shown that shearing caused by the sludge recirculation pumps in the SMBRe reduced biomass growth considerably. The SMBRe presented better performance in terms of fouling than the SMBRi, which was associated with the higher concentration of suspended solids and SMP and EPS in the SMBRi. The SMP concentrations (mgSMP/gMLVSS) were superior in the SMBRe, showing that the friction from recirculation pumps leads to the breakdown of flocs and/or cells and to the release of polymeric material into the mixed liquor. Since this effect was more intense for SMP quantified in terms of extracellular transparent polymers, the conclusion was that apparently these substances participate in cellular metabolism in a different way than the carbohydrates and proteins, and that these can be more associated with released substances due to shear stress.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1944-3986 1944-3994 1944-3986
DOI:	10.1080/19443994.2013.799048