Performance evaluation of startup for a yeast membrane bioreactor (MBRy) treating landfill leachate

ABSTRACT

The startup process of a membrane bioreactor inoculated with yeast biomass (Saccharomyces cerevisiae) and used in the treatment of landfill leachate was evaluated. The yeast membrane bioreactor (MBRy) was inoculated with an exogenous inoculum, a granulated active dry commercial bakers' yeast. The MBRy was successfully started up with a progressive increase in the landfill leachate percentage in the MBRy feed and the use of Sabouraud Dextrose Broth. The membrane plays an important role in the startup phase because of its full biomass retention and removal of organic matter. MBRy is a suitable and promising process to treat recalcitrant landfill leachate. After the acclimation period, the COD and NH₃ removal efficiency reached values of 72 ± 3% and 39 ± 2% respectively. MBRy shows a low membrane-fouling potential. The membrane fouling was influenced by soluble microbial products, extracellular polymeric substances, sludge particle size, and colloidal dissolved organic carbon.

KEYWORDS:

• Membrane bioreactor
• membrane fouling
• landfill leachate
• toxicity
• yeast

Funding

This work was supported by the Coordination of Superior Level Staff Improvement (CAPES), associated National Council for Scientific and Technological Development (CNPq), Foundation for Research Support of the State of Minas Gerais (FAPEMIG), Federal University of Minas Gerais, Brazil (UFMG), and Federal Center of Technological Education of Minas Gerais (CEFET-MG).