Microbiological and biochemical characterisation of dairy and brewery wastewater microbiota

Mihaela Palela; George Ifrim; Gabriela Bahrim

Mihaela Palela Bioengineering Department, Dunarea de Jos University of Galati, Faculty of Food Science and Engineering
George Ifrim Bioengineering Department, Dunarea de Jos University of Galati, Faculty of Food Science and Engineering
Gabriela Bahrim Bioengineering Department, Dunarea de Jos University of Galati, Faculty of Food Science and Engineering

Keywords: wastewater microbiota, dairy and brewery industry, biodegradability, microbiological and biochemical characterization

Abstract

This research was conducted to study the wastewater microbiota and to identify some new active strains
adapted to the wastewater physical - chemical conditions, for using them as specialised inoculum in
wastewater treatment on test models, in laboratory bioreactors or pilot plants. Thus, the dairy and
brewery industry wastewater’s microorganisms were isolated in pure cultures and were analyzed
regarding the biochemical properties. The biodegradation essay revealed the potential of the isolated
cultures to metabolize organic compounds, similar to those which determine the pollution of food industry
wastewaters such as starch, casein, basic carbohydrates and lactic acid. There were identified strains
able to produce a fast biodegradation of the organic compounds. Epifluorescence microscopy revealed
the microbiota variety in the food industry wastewaters, with Gram negative bacteria as predominant
microorganisms.

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