Comparison of commercial baker's yeast versus bacteria-based membrane bioreactors for landfill leachate treatment. Issue 18 (17th September 2018)

• Record Type: Journal Article
• Authors: Amaral, M. C. S.; Brito, G. C. B.; Reis, B. G.; Lange, L. C.; Moravia, W. G.
• Is Part Of: Environmental technology. Volume 39:Issue 18(2018)
• Page Start: 2365
• Page End: 2372
• Publication Date: 2018-09-17
• Subjects: Membrane bioreactor -- baker's yeast -- landfill leachate -- fouling -- microfiltration; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2017.1355931
• Languages: English
• ISSNs: 0959-3330

Abstract

ABSTRACT: This study compares the performance of the membrane bioreactor (MBR) inoculated with commercial baker's yeast ( Saccharomyces cerevisiae ) (MBRy) versus one inoculated with bacterial sludge (MBRb) for treatment of landfill leachate. The MBRb and MBRy were operated with a hydraulic retention time of 48 h, solids retention time of 60 d, and specific air demand based on membrane area of 0.6 m 3 h −1 m −2 . The MBRy was more efficient in removing chemical oxygen demand (COD) (68 ± 12%), color (79 ± 8%), ammoniacal nitrogen (58 ± 18%), and phosphorus (62 ± 19%) compared to MBRb, which showed removal efficiencies of 44 ± 18%, 46 ± 20%, 45 ± 17%, and 29 ± 15% for COD, color, ammoniacal nitrogen, and phosphorus. Furthermore, the MBRy had lower production of soluble microbial products, which are the main cause of membrane fouling, and so a lower membrane fouling potential. The average hydraulic permeability of the MBRy (32.23 L m −2 h −1 bar −1 ) was about four times higher than that of the MBRb (8.34 L m −2 h −1 bar −1 ). Thus using commercial baker's yeasts as a MBR inoculum can enhance pollutants' removal and membrane performance.