Table 2 shows the results of the quantitative analyses of E. coli in
water (CFU100ml1) and solid samples (CFU g1), and its
reduction (Log10 (%)) along both water and sludge treatment lines.
E. coli was analyzed as an indicator of the fecal enterobacteria
present at high concentrations in the incoming water (raw water).
Although their total removal is not achieved, the final reduction of
E. coli along water treatment line was 2.34 log units (Table 2),
similar to those determined by Reinthaler et al. (2003) and Muela
et al. (2011) when studying secondary treatment plants they used
activated sludge as secondary treatment, as well as that found by
Tyagi et al. (2011) in different treatments. In this work, the greatest
reduction of E. coli concentration in the water line was obtained in