Water disinfection using silver and copper ions and colloidal gold

The efficacy of using Ag+ and Cu2+ metal ions and colloidal Au combinations (within the limits of current drinking water regulations) for killing Typhoid-Paratyphoid, Legionella pneumophila, Salmonella, Vibrio cholerae asiaticea, Lamblia intestinalis, Cryptosporidium parvum, etc. has been examined. Tests carried out in various laboratories during 1998-2003 have shown the dependence of bacteria killing time on metal ion concentration, initial bacteria concentration, and the influence of the concentration of various ions (Cl-, SO42-, S2-, Fe2+, Fe3+) on the disinfection process.