Microbial characterisation of activated sludge in jet-loop bioreactors treating winery wastewaters | Zendy

Ana Eusébio | Zendy; Maurizio Petruccioli | Zendy; Manuela Lageiro | Zendy; Federico Federici | Zendy; José Cardoso Duarte | Zendy

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Microbial characterisation of activated sludge in jet-loop bioreactors treating winery wastewaters

Author(s) -

Ana Eusébio,

Maurizio Petruccioli,

Manuela Lageiro,

Federico Federici,

José Cardoso Duarte

Publication year - 2004

Publication title -

journal of industrial microbiology and biotechnology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.857

H-Index - 112

eISSN - 1476-5535

pISSN - 1367-5435

DOI - 10.1007/s10295-004-0111-3

Subject(s) - winery , effluent , bioreactor , chemical oxygen demand , microbial consortium , biology , biomass (ecology) , wastewater , activated sludge , population , pulp and paper industry , food science , sewage treatment , microbiology and biotechnology , microorganism , environmental science , bacteria , environmental engineering , ecology , botany , genetics , demography , wine , sociology , engineering

Jet-loop reactors (JLR) used as biological waste treatment processes introduce an additional selective pressure on the natural microbial flora of the incoming effluent. Several high-performing microbial inocula were tested for winery wastewater treatment and the microbial composition was analysed. A microbial consortium was enriched and selected for use with a new type of aerobic JLR. The reactor was operated continuously for more than 1 year using winery wastewaters collected in different seasons. Chemical oxygen demand (COD) removal efficiency was on average greater than 80%, with retention times of 0.8-1 day. Microbial populations were sampled for characterisation after 6 months and at the end of the study. Isolates were identified at genus and/or species level. Almost all isolates belonged to the genera Pseudomonas and Bacillus. Saccharomyces cerevisiae was also found but no filamentous fungi. These results show that a highly adapted population develops in JLRs treating winery effluents as compared to other bioreactors. Aerobic JLRs impose a stringent selective criterion on the composition of the microbial biomass.

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