MICROBIOLOGICAL EFFECTS OF COMBINATIONS OF COLLOIDAL SILVER (Ag), COPPER (Cu), SILICON (Si) AND ZINC (Zn) NANOPARTICLES FOR WASTE WATER
NEDYALKA VALCHEVA
Department Biochemistry, Microbiology, Physics, Faculty of Agriculture, Trakia University, Stara Zagora- 6000, Bulgaria.
IGNAT IGNATOV *
Scientific Research Center of Medical Biophysics, Sofia, Bulgaria.
*Author to whom correspondence should be addressed.
Abstract
Colloidal nanomaterials with antibacterial activity are applied in practice. Most commonly used are colloidal nanosilver (Ag) and nanocopper (Cu) as separate nanomaterials, and combinations between them with different concentrations in ppm. In the present study the microbiological/antibacterial effects of colloidal solutions with two and four types of nanoparticles are investigated. The two solutions are a combination of colloidal nanosilver (Ag) and copper (Cu), and the third solution contains colloidal nanosilver (Ag), nanocopper (Cu), nanozinc (Zn) and nanosilicon (Si). The potential antibacterial activity of the studied colloidal solutions against Escherichia coli, Enterococci and Coliforms was evaluated. The results proved that they can be used to disinfect surfaces and neutralize bacteria in wastewater.
Keywords: Colloidal solutions, chemical compounds, microbiology