Green Synthesis of Silver Nanoparticles from the Opuntia ficus-indica Fruit and Its Activity against Treated Wastewater Microorganisms

Table 1

Total and fecal coliforms in water samples from the AUA treatment plant, treated and untreated with different OfAgNPs concentrations.

Tertiary treatment	Total coliforms; (MPN/100 ml)	Faecal coliforms; (MPN/100 ml)	Identified species
No treatment	430	150	E. coli var 1, E. aerogenes var 1, C. freundii var 2, E. coli atypical
Chlorination	91	0.03	E. coli var 1
0.5 mg/ml of OfAgNPs (0.120 mg of Ag^+)	0.03	0.03	None
1.0 mg/ml de OfAgNPs (0.241 mg de Ag^+)	0.03	0.03	None
Chlorination + 0.5 mg/ml of OfAgNPs	0.03	0.03	None
Chlorination + 1.0 mg/ml of OfAgNPs	0.03	0.03	None

MPN: most probably number.