Comparison of commercial baker’s yeast versus bacteria-based membrane bioreactors for landfill leachate treatment

2017 ◽  
Vol 39 (18) ◽  
pp. 2365-2372 ◽  
Author(s):  
M. C. S. Amaral ◽  
G. C. B. Brito ◽  
B. G. Reis ◽  
L. C. Lange ◽  
W. G. Moravia
Keyword(s):  
Landfill Leachate ◽  
Membrane Bioreactors ◽  
Baker’S Yeast ◽  
Baker's Yeast ◽  
Leachate Treatment

Landfill Leachate Treatment by Yeast and Bacteria Based Membrane Bioreactors

2004 ◽  
Vol 39 (9) ◽  
pp. 2391-2404 ◽  
Author(s):  
B. Wichitsathian ◽  
S. Sindhuja ◽  
C. Visvanathan ◽  
K. H. Ahn
Keyword(s):  
Landfill Leachate ◽  
Membrane Bioreactors ◽  
Leachate Treatment

Effects of mixed liquor pH on membrane fouling and micro-pollutant removals in membrane bioreactors for municipal landfill leachate treatment

2015 ◽  
Vol 72 (5) ◽  
pp. 770-778 ◽  
Author(s):  
Samunya Sanguanpak ◽  
Chart Chiemchaisri ◽  
Wilai Chiemchaisri ◽  
Kazuo Yamamoto
Keyword(s):  
Landfill Leachate ◽  
Membrane Fouling ◽  
Membrane Surface ◽  
Membrane Bioreactors ◽  
Leachate Treatment ◽  
Mixed Liquor ◽  
Municipal Landfill ◽  
Inorganic Substances ◽  
Ph Level ◽  
Ph Variations

This research investigated the membrane fouling and micro-pollutant removals in treatment of municipal landfill leachate at various pH levels (i.e. 5.5, 6.5, 7.5, and 8.5) using membrane bioreactors. The findings revealed that membrane fouling was influenced by the pH level of mixed liquor, with pH 5.5 exhibiting the most severe membrane fouling. At pH 5.5, proteins and carbohydrates were predominant in the membrane foulants, while at pH 8.5 humic-like and inorganic substances constituted the largest proportion of the foulants on the membrane surface. The removal efficiencies of micro-pollutants (bisphenol-A; 2,6-di-tert-butylphenol and 2,6-di-tert-butyl-4-methylbutylphenol) were nevertheless insignificantly influenced by the pH levels of mixed liquor. In addition, the removal rates of the compounds at pH 5.5 were slightly lower vis-à-vis at the higher pH levels. The micro-pollutant retention on the fouled membranes was also significant and highest under the mixed liquor pH of 8.5. Furthermore, the experiments demonstrated that the varying degrees of rejection by the fouled membranes could be attributed to the alteration of foulant characteristics as a result of the pH variations.

Occurrence and removal of endocrine disrupters in landfill leachate treatment plants

2003 ◽  
Vol 48 (3) ◽  
pp. 127-134 ◽  
Author(s):  
T. Wintgens ◽  
M. Gallenkemper ◽  
T. Melin
Keyword(s):  
Activated Carbon ◽  
Bisphenol A ◽  
Reverse Osmosis ◽  
Landfill Leachate ◽  
Endocrine Disrupting Compounds ◽  
Membrane Bioreactors ◽  
Industrial Chemicals ◽  
Activated Carbon Adsorption ◽  
Leachate Treatment ◽  
Carbon Adsorption

Endocrine disrupting compounds can affect the hormone system in organisms. Industrial chemicals with estrogenic effects were detected in large quantities in landfill leachates. Membrane technology has proven to be an effective barrier to these substances and thus widely applied in the treatment of landfill leachate. The removal techniques under investigation are membrane bioreactors, nanofiltration, activated carbon adsorption, ozonation as well as reverse osmosis. Investigations were conducted at two different landfill leachate treatment plants with a variety of process configurations. The xenoestrogenic substances nonylphenol and bisphenol A were detected in high μg/L-ranges in raw landfill leachate. Membrane bioreactors (MBRs) were capable of removing more than 80% of the nonylphenol load. Final effluent concentrations range between 1-12 μg/L nonylphenol and 3-30 μg/L bisphenol A respectively. Reverse osmosis treatment proved to be less effective in nonylphenol and bisphenol A removal than MBRs with further polishing stages like nanofiltration and activated carbon adsorption.

Long-term evaluation of membrane bioreactor inoculated with commercial baker's yeast treating landfill leachate: pollutant removal, microorganism dynamic and membrane fouling

2019 ◽  
Vol 79 (2) ◽  
pp. 398-410 ◽  
Author(s):  
Gabriela C. B. Brito ◽  
Liséte C. Lange ◽  
Vera L. Santos ◽  
Míriam C. S. Amaral ◽  
Wagner G. Moravia
Keyword(s):  
Landfill Leachate ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Extracellular Polymeric Substances ◽  
Baker’S Yeast ◽  
Pollutant Removal ◽  
Baker's Yeast ◽  
Yeast Saccharomyces Cerevisiae ◽  
Membrane Area ◽  
Cake Layer

Abstract In this study, commercial baker's yeast (Saccharomyces cerevisiae) was employed as a novel inoculum for a membrane bioreactor (MBRy). It was applied to landfill leachate (LFL) treatment to remove recalcitrant organic compounds as well as for the assimilation of recalcitrant compounds, since yeasts have a high ability to break such compounds down. The MBR was inoculated with 10 g L−1 of commercial baker's yeast and was operated at a hydraulic retention time of 48 h and pH of 3.5. The specific air demand based on the membrane area (SADm) was maintained at 0.6 m3 h−1 m−2. The MBRy achieved chemical oxygen demand (COD), color, NH3, and humic substances removal of 68, 79, 68, and 50%, respectively. Furthermore, the MBRy showed lower fouling potential, which can be attributed to the low extracellular polymeric substances production, as the formation of a cake layer was the major mechanism of membrane fouling. The work demonstrated that novel MBR is a promising technology for treating recalcitrant landfill leachate.

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