Journal
WATER ENVIRONMENT RESEARCH
Volume 80, Issue 4, Pages 346-354Publisher
WATER ENVIRONMENT FEDERATION
DOI: 10.2175/106143007X221418
Keywords
wastewater treatment plants; monitoring; cell viability; flow cytometry; Escherichia coli
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The activated sludge process is performed by a variable and mixed community of microorganisms in an aerobic aquatic environment, in which bacteria constitute the majority and represent the main microorganisms responsible for the degradation process in a plant. In this work, we monitored bacterial charge in different wastewater treatment plants by flow cytometry, also evaluating chlorination effects on bacterial viability, both by flow cytometry and traditional plate counts. Maximum values of bacterial charge were registered in the aeration tank of all plants monitored. Cell viability did not show significant differences (p > 0.05) in samples collected in before chlorination'' and wastewater effluent'' treatment steps; this suggests that the chlorination was not able to decrease total viable bacterial charge. In this work, we discuss the need to improve microbiological analyses, both in terms of measuring other potential pathogens and of using new methodological approaches in the traditional evaluation of the microbiological quality of effluents.
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