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Taskan E.,Firat University | Hasar H.,Firat University | Hasar H.,National Research Center on Membrane Technologies
Clean - Soil, Air, Water | Year: 2012

Leachate treatment using a membrane bioreactor is an effective method. This study presents a configuration including an anaerobic bioreactor and a membrane module, called submerged anaerobic membrane bioreactor (SAnMBR), for treating influent with leachate/acetate rations (L/A), that were kept to be 10, 25, 50, 75, and 100% at a constant SRT (100 days). COD removal decreased from 85 to 75% when the L/A ratio increased from 10 to 100. To prevent membrane fouling, a SAnMBR was operated in the case of circulation of mixed liquor under continuous and intermittent suction. The average fluxes were 2.60 and 0.40L/m2h at the periods of intermittent and continuous suction, respectively. The methane production varied between 0.25 and 0.32L CH4/g CODremoved. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Koseoglu-Imer D.Y.,National Research Center on Membrane Technologies | Koseoglu-Imer D.Y.,Gebze Institute of Technology | Dizge N.,National Research Center on Membrane Technologies | Dizge N.,Gebze Institute of Technology | And 2 more authors.
Colloids and Surfaces B: Biointerfaces | Year: 2012

In this study, the surface of cellulose acetate (CA) ultrafiltration membrane was activated with serine protease (Savinase) enzyme to reduce protein fouling. Enzyme molecules were covalently immobilized with glutaraldehyde (cross-linking agent) onto the surface of CA membranes. The membrane activation was verified using filtration experiments and morphological analysis. Scanning electron microscopy (SEM) images and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy of the activated membrane when compared with raw membrane were confirmed that the enzyme was immobilized onto the membrane surface. The immobilization efficiencies changed from 13.2 to 41.2% according to the enzyme ratios from 2.5 to 10.0mg/mL. However, the permeability values decreased from 232±6 to 121±4L/m 2hbar with increasing enzyme concentration from 2.5 to 10.0mg/mL. In fouling experiments, bovine serum albumin (BSA) was used as the protein model solution and activated sludge was used as the model biological sludge. Enzyme-activated membranes exhibited good filtration performances and protein rejection efficiencies were compared with raw CA membrane. Also the relative flux reduction (RFR) ratios of membranes were calculated as 97% and 88% for raw CA and enzyme-activated membranes (5mg/mL savinase), respectively. The membrane activated with Savinase enzyme could be proposed as a surface treatment method before filtration to mitigate protein fouling. © 2011 Elsevier B.V. Source


Ovez S.,Technical University of Istanbul | Ovez S.,National Research Center on Membrane Technologies | Turken T.,Technical University of Istanbul | Turken T.,National Research Center on Membrane Technologies | And 13 more authors.
Desalination and Water Treatment | Year: 2015

Recent developments indicate an increase in demand of water supply and protection of natural water source quality with a requirement of advanced wastewater treatment systems. Formation of biofilms on the membrane surfaces and in the pores of membranes which are caused by extracellular polymeric substances and soluble microbial products has been identified as the main source of biofouling in membrane operation. The secretion of total polysaccharides and proteins by micro-organisms can be lowered when they are exposed to the bismuth-BAL chelate (BisBAL) at near minimum inhibition concentration. Our study aimed at controlling the population and co-products of micro-organisms that cause biofouling. After successful studies with the inhibition of Escherichia coli and Streptococcus pyogenes in activated sludge, BisBAL-containing membranes were fabricated. The effect of BisBAL on membrane performance was also observed. FTIR, SEM, contact angle, and surface roughness analyses were performed for the characterization of the membranes. Originality of this study comes from the usage of BisBAL for the first time for membrane synthesis. © 2015 Balaban Desalination Publications. All rights reserved. Source

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