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Table 1

Concentration of indicator bacteria and pathogens measured (CFU/g total solids) in bulk fecal sludge samples

OrganismTask typeN> LOD% >LODRangeGM (GSD)
Total coliform Collection 15 14 93 5.2 × 104–1.5 × 107 1.2 × 106 (8.1) 
Facility 100 8.7 × 106–1.7 × 107 1.20 × 107 (1.6) 
Fuel 10 10 100 2.1 × 105–4.7 × 107 4.2 × 106 (5.1) 
  *LOD TC: 3.3 × 104 CFU/g-collection, 3.0 × 103 CFU/g-facility, 1.1 × 103 CFU/g-fuel 
E. coli Collection 15 13 86 4.2 × 104–5.2 × 106 2.9 × 105 (5.9) 
Facility – – 
Fuel 10 50 5.3 × 104–2.1 × 106 3.9 × 105 (6.4) 
  *LOD E. coli: 3.3 × 104 CFU/g-collection, 3.0 × 103 CFU/g-facility, 1.1 × 103 CFU/g-fuel 
Adenovirus Collection 18 16 89 2.9 × 103–2.6 × 106 7.6 × 104 (5.7) 
Facility 16 16 100 3.8 × 102–1.2 × 106 9.1 × 103 (8.3) 
Fuel 67 4.5 × 102–1.5 × 104 3.4 × 103 (5.0) 
  *LOD Cryptosporidium: 1 copies/g-collection; 49 copies/g-facility; 215 copies/g-fuel 
Cryptosporidium Collection 18 17 1.7 × 104–4.8 × 104 2.9 × 104 (1.7) 
Facility 16 13 1.2 × 103–3.5 × 105 2.1 × 104 (5.4 × 101
Fuel 22 9.6 × 102–6.3 × 105 2.5 × 104 (9.8 × 101
  *LOD Cryptosporidium: 11 copies/g-collection; 156 copies/g-facility; 346 copies/g-fuel 
OrganismTask typeN> LOD% >LODRangeGM (GSD)
Total coliform Collection 15 14 93 5.2 × 104–1.5 × 107 1.2 × 106 (8.1) 
Facility 100 8.7 × 106–1.7 × 107 1.20 × 107 (1.6) 
Fuel 10 10 100 2.1 × 105–4.7 × 107 4.2 × 106 (5.1) 
  *LOD TC: 3.3 × 104 CFU/g-collection, 3.0 × 103 CFU/g-facility, 1.1 × 103 CFU/g-fuel 
E. coli Collection 15 13 86 4.2 × 104–5.2 × 106 2.9 × 105 (5.9) 
Facility – – 
Fuel 10 50 5.3 × 104–2.1 × 106 3.9 × 105 (6.4) 
  *LOD E. coli: 3.3 × 104 CFU/g-collection, 3.0 × 103 CFU/g-facility, 1.1 × 103 CFU/g-fuel 
Adenovirus Collection 18 16 89 2.9 × 103–2.6 × 106 7.6 × 104 (5.7) 
Facility 16 16 100 3.8 × 102–1.2 × 106 9.1 × 103 (8.3) 
Fuel 67 4.5 × 102–1.5 × 104 3.4 × 103 (5.0) 
  *LOD Cryptosporidium: 1 copies/g-collection; 49 copies/g-facility; 215 copies/g-fuel 
Cryptosporidium Collection 18 17 1.7 × 104–4.8 × 104 2.9 × 104 (1.7) 
Facility 16 13 1.2 × 103–3.5 × 105 2.1 × 104 (5.4 × 101
Fuel 22 9.6 × 102–6.3 × 105 2.5 × 104 (9.8 × 101
  *LOD Cryptosporidium: 11 copies/g-collection; 156 copies/g-facility; 346 copies/g-fuel 

GM, geometric mean; GSD, geometric standard deviation.

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