Influence of sludge retention time on filtration performance and biomass characteristics in a hollow fiber membrane bioreactor

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Title: Influence of sludge retention time on filtration performance and biomass characteristics in a hollow fiber membrane bioreactor
Authors: Bernal, María Ángeles | Domínguez Chabaliná, Liuba | Rodríguez Pastor, Manuel | Prats, Daniel
Research Group/s: Recursos Hídricos y Desarrollo Sostenible
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Química | Universidad de Alicante. Instituto Universitario del Agua y de las Ciencias Ambientales
Keywords: Biomass characterization | Filtration process | Membrane bioreactor | Solid retention time | Wastewater treatment
Knowledge Area: Ingeniería Química
Issue Date: 2014
Publisher: WIT Press
Citation: WIT Transactions on The Built Environment. 2014, 145: 291-298. doi:10.2495/ICBEEE130371
Abstract: In this study, the filtration process and the biomass characteristics in a laboratory-scale submerged membrane bioreactor (MBR) equipped with a hollow fiber (HF) microfiltration membrane were studied at different solid retention times (SRT). The MBR was fed by synthetic wastewater and the organic loading rate (OLR) was 0.5, 0.2, 0.1, and 0.08 kg COD kg VSS−1 d−1 for 10, 30, 60, and 90 days of SRT, respectively. The hydraulic retention time was 8.4 h and the permeate flux was 6 L m−2 h−1(LMH). Data analysis confirmed that at all the studied SRTs, the HF-MBR operated very good obtaining of high quality permeates. Chemical Oxygen Demand (COD) removal efficiencies were higher than 95%. The best filtration performance was reached at SRT of 30 d. On the other hand, the respirometric analysis showed that biomass was more active and there was more biomass production at low SRTs. The concentration of soluble extracellular polymeric substances (EPS) decreased with increasing SRT. A decrease of soluble EPS caused a decrease of membrane fouling rate, decreasing the frequency of chemical cleanings. The floc size decreased with SRT increasing. At high SRTs, there was more friction among particles due to the increase of the cellular density and the flocs broke decreasing their size.
Sponsor: This study was partially financed by the Ministry of Education via the projects “Treatment of superficial water and wastewater to obtain high quality effluents” (CTM2012-15348) and “Treatment and wastewater reuse for a sustainable management” (CONSOLIDER) (CSD200644), and by the Ministry of Environment via the project “Removal of organic micropollutants by MBR technology associated to nanofiltration” (I24/SGTB/2007/3.1).
ISSN: 1746-4498 (Print) | 1743-3509 (Online)
DOI: 10.2495/ICBEEE130371
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2014 WIT Press
Peer Review: si
Publisher version:
Appears in Collections:INV - Recursos Hídricos y Desarrollo Sostenible - Artículos de Revistas

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