Dissolved air flotation as a potential treatment process to remove Giardia cysts from anaerobically treated sewage

Controlling Giardia cysts in sewage is an essential barrier for public health protection, reducing possible routes of protozoa transmission. The aim of this study was to evaluate the capability of dissolved air flotation (DAF), on a bench scale, to remove Giardia cysts from anaerobic effluent. Moreo...

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Bibliographic Details
Published in:Environmental technology 2017-10, Vol.38 (19), p.2392-2399
Main Authors: Santos, Priscila Ribeiro dos, Daniel, Luiz Antonio
Format: Article
Language:English
Subjects:
Air
Anaerobic effluent
Anaerobic microorganisms
Anaerobic processes
Color
Cysts
dissolved air flotation
Effluent treatment
Effluents
Flocculation
flocculation conditions
Flotation
Giardia
Giardia spp
indicator microorganisms
Microorganisms
Protozoa
Public health
Separation techniques
Sewage
Sewage treatment
Therapeutic applications
Treated sewage
Turbidity
Velocity
Waste treatment
Waste Water
Wastewater
Wastewater treatment
Water Purification - methods
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Summary:Controlling Giardia cysts in sewage is an essential barrier for public health protection, reducing possible routes of protozoa transmission. The aim of this study was to evaluate the capability of dissolved air flotation (DAF), on a bench scale, to remove Giardia cysts from anaerobic effluent. Moreover, removals of indicator microorganisms and physical variables were also investigated. Flocculation conditions were studied, associating different flocculation times with different mean velocity gradients. DAF treatment achieved mean log removals in the range of 2.52-2.62 for Giardia cysts, depending on the flocculation condition. No statistical differences were observed among the flocculation conditions in terms of cyst removal. Low levels of turbidity and apparent color obtained from the treated effluent may indicate good treatment conditions for the DAF process in cyst removal. Indicator microorganisms were not able to predict the parasitological quality of the wastewater treated by flotation in terms of cyst concentrations. The DAF process provided an effective barrier to control cysts from sewage, which is an important parasite source.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2016.1262461