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A new silver based composite material for SPA water disinfection
M A Tartanson1, L Soussan2, M Rivallin2
1Institut Europeen des Membranes - IEM, (UMR 5635 CNRS-ENSCM-UM2) - Equipe Genie des Procedes Membranaires, Universite Montpellier II cc047, Place Eugene Bataillon, 34095 Montpellier Cedex 5, France; CARDPool SAS, Research and Development Site, 37 Avenue Vincent d'Indy, 30100 Alès, France.
A novel alumina composite material with titanium dioxide and silver nanocoatings effectively disinfects spa water. This advanced material rapidly eliminates bacteria, even under challenging conditions, meeting EPA disinfection standards.
Area of Science:
- Materials Science
- Environmental Science
- Microbiology
Background:
- Spa water disinfection faces challenges from common microorganisms.
- Existing methods may have limitations in efficacy or environmental impact.
- Development of novel antimicrobial materials is crucial for water safety.
Purpose of the Study:
- To investigate the bactericidal efficacy of a new composite material (Alumina-Titanium Dioxide-Silver) for spa water disinfection.
- To evaluate the material's performance under various operational conditions relevant to spa environments.
- To assess the material's potential for meeting regulatory disinfection standards.
Main Methods:
- Synthesis of an alumina (Al2O3) composite material modified with titanium dioxide (TiO2) and silver (Ag) nanocoatings.
- Testing bactericidal activity against surrogate bacteria (Escherichia coli, Staphylococcus epidermidis) under varied temperatures, salt concentrations (CaCO3, CaCl2), and oxygen levels.
- Evaluation in a continuous water flow system to simulate real-world application.
Main Results:
- The Al2O3-TiO2-Ag composite demonstrated potent bactericidal properties, achieving total bacterial removal (10^8 CFU mL^-1) in under 10 minutes at 16 g L^-1.
- Optimal performance was observed at 37°C and under aerobic conditions, promoting Reactive Oxygen Species (ROS) generation.
- Calcium chloride (CaCl2) stabilized silver desorption, while calcium carbonate (CaCO3) had no impact.
- In continuous flow tests, 2 g L^-1 eliminated over 90% of bacteria and met EPA disinfection standards within 22 hours.
Conclusions:
- The Al2O3-TiO2-Ag composite material is a highly effective agent for spa water disinfection.
- Its efficacy is robust across a range of relevant spa water conditions.
- The material shows promise for meeting stringent disinfection standards in practical applications.
