Electrochemical disinfection of bacteria-laden water using antimony-doped tin-tungsten-oxide electrodes
| Autor: | Nathalie Tufenkji, Sasha Omanovic, Bahareh Asadishad, Saloumeh Ghasemian |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Antimony
Environmental Engineering Inorganic chemistry chemistry.chemical_element Portable water purification 02 engineering and technology Wastewater 010501 environmental sciences Electrochemistry 01 natural sciences Chloride Tungsten Water Purification chemistry.chemical_compound Water Supply medicine Chlorine Electrodes Waste Management and Disposal Effluent 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering Bacteria Hydroxyl Radical Ecological Modeling Tin Compounds Oxides Electrochemical Techniques 021001 nanoscience & nanotechnology Saline water Pollution 6. Clean water Disinfection chemistry Hydroxyl radical Reactive Oxygen Species Water Microbiology 0210 nano-technology medicine.drug |
| Zdroj: | Water Research. 126:299-307 |
| ISSN: | 0043-1354 |
| Popis: | Electrochemical disinfection has been shown to be an efficient method with a shortrequired contact time for treatment of drinking water supplies, industrial raw water supplies, liquid foodstuffs, and wastewater effluents. In the present work, the electrochemical disinfection of saline water contaminated with bacteria was investigated in chloride-containing solutions using Sb-doped Sn80%-W20%-oxide anodes. The influence of current density, bacterial load, initial chloride concentration, solution pH, and the type of bacteria (E. coli D21, E. coli O157:H7, and E. faecalis) on disinfection efficacy was systematically examined. The impact of natural organic matter and a radical scavenger on the disinfection process was also examined. The electrochemical system was highly effective in bacterial inactivation for a 0.1 M NaCl solution contaminated with ∼107 CFU/mL bacteria by applying a current density ≥1 mA/cm2 through the cell.100% inactivation of E. coli D21 was achieved with a contact time of less than 60 s and power consumption of 48 Wh/m3, by applying a current density of 6 mA/cm2 in a 0.1 M NaCl solution contaminated with ∼107 CFU/mL. Reactive chlorine species as well as reactive oxygen species (e.g. hydroxyl radicals) generated in situ during the electrochemical process were determined to be responsible for inactivation of bacteria. |
| Databáze: | OpenAIRE |
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