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The Adenovirus results obtained for sludges sampled at various stages of treatment and biosolids in one- and two-year stockpiles at Boneo and Somers WwTPs are presented in Table 3.

Table 3

Adenovirus concentrations at various stages of the sludge treatment process at Boneo and Somers WwTPs

Sludge source and stockpile sample dateAdenovirus (MPNIU g−1 DS) Mean/MLEStandard deviationNumber of samples (n)
Boneo WwTP 
WASa 340 430 26 
Belt press feed sludgea 26 50 23 
Solar dryer sludgeb,c 0.12 0.01 
Solar dryer shed 1c 0.48 0.81 
Solar dryer shed 2c 0.18 0.12 
Solar dryer shed 3c 0.12 
Drying pan sludgec 1.2 1.5 
Drying pan route – 1-year stockpiles 
13-Mar-2015 <0.02 n/a 
12-Nov-2015 <0.02 n/a 
Drying pan route – 2-year stockpiles 
13-Mar-2015 <0.02 n/a 
19-Mar-2015 <0.02 n/a 
Solar drying route – 1-year stockpile 
12-Nov-2015 <0.02 n/a 
Solar drying route – 2-year stockpile 
13-Mar-2015 <0.02 n/a 
Somers WwTP 
WASa 950 1,100 24 
Drying pan sludgec 2.4 1.6 
1-year stockpiles 
18-Mar-2015 <0.02 n/a 
12-Nov-2015 <0.02 n/a 
12-Nov-2015 <0.02 n/a 
2-year stockpile 
18-Mar-2015 <0.02 n/a 
Sludge source and stockpile sample dateAdenovirus (MPNIU g−1 DS) Mean/MLEStandard deviationNumber of samples (n)
Boneo WwTP 
WASa 340 430 26 
Belt press feed sludgea 26 50 23 
Solar dryer sludgeb,c 0.12 0.01 
Solar dryer shed 1c 0.48 0.81 
Solar dryer shed 2c 0.18 0.12 
Solar dryer shed 3c 0.12 
Drying pan sludgec 1.2 1.5 
Drying pan route – 1-year stockpiles 
13-Mar-2015 <0.02 n/a 
12-Nov-2015 <0.02 n/a 
Drying pan route – 2-year stockpiles 
13-Mar-2015 <0.02 n/a 
19-Mar-2015 <0.02 n/a 
Solar drying route – 1-year stockpile 
12-Nov-2015 <0.02 n/a 
Solar drying route – 2-year stockpile 
13-Mar-2015 <0.02 n/a 
Somers WwTP 
WASa 950 1,100 24 
Drying pan sludgec 2.4 1.6 
1-year stockpiles 
18-Mar-2015 <0.02 n/a 
12-Nov-2015 <0.02 n/a 
12-Nov-2015 <0.02 n/a 
2-year stockpile 
18-Mar-2015 <0.02 n/a 

n/a = not applicable; MLE = maximum likelihood estimate of the mean.

aSampling was conducted on an approximately fortnightly basis between 19 November 2014 and 19 November 2015 at Boneo WwTP and 19 November 2014 and 18 November 2015 at Somers WwTP.

bComposite samples of solar drying sheds 1–3.

cSampling conducted at harvest.

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