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A Field Study of Virus Removal in Septic Tank Drainfields

L.A. Nicosia*,a, J.B. Rosea, L. Starkb and M.T. Stewartc

a Dep. of Marine Science, Univ. of South Florida, 140 7th Ave. S., St. Petersburg, FL 33701
b Tampa Dep. of Health, 3952 W. Dr. Martin Luther King Jr. Blvd., Tampa, FL 33614
c Dep. of Geology, Univ. of South Florida, Fowler Avenue, Tampa, FL 33602



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  		Fig. 1. Cross-sectional view of the research station (modified from D.L. Anderson et al., unpublished data, 1993). Bacteriophage PRD1 and bromide were added to cells via the observation port. Effluent was applied to each cell, six times daily. Two effluent loading rates were evaluated (0.032 and 0.063 m/d).

 


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  		Fig. 2. Bacteriophage PRD1 and bromide breakthrough curves. (a) High-load cell, Study 1; (b) High-load cell, Study 2; (c) Low-load cell, Study 2. C/C0 = log10 (effluent at 0.6 m)/log10 (influent). Bromide was not detected in the Study 1 low-load cell.

 


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  		Fig. 3. Bacteriophage PRD1 transport and rainfall received at the research station: Study 1. Total rainfall received = 240 mm.

 


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  		Fig. 4. Bacteriophage PRD1 transport and rainfall received at the research station: Study 2. Total rainfall received = 250 mm.

 




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