Overall, the biological process of this WWTP appears to be
effective for the reduction of the numbers of AMPR and CAFR total
coliforms and E. coli by about 2-log units, and E. coli colonies seem
to be the most resistant as AMPR E. coli colonies increase compared
to total coliforms with increasing AMP concentration. The high
percentage of AMPR E. coli versus total E. coli in the influent (i.e., the
IN-BIO samples) also seems to correlate with the more than twenty
hospitals and clinics in the Milan area from which the plant receives
the wastewaters