期刊
ENVIRONMENTAL TECHNOLOGY
卷 38, 期 19, 页码 2392-2399出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2016.1262461
关键词
Anaerobic effluent; dissolved air flotation; flocculation conditions; Giardia spp.; indicator microorganisms
资金
- Coordination for The Improvement of Higher Education Personnel (CAPES)
- Sao Paulo Research Foundation (FAPESP) [2012/50522-0]
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.
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