Inactivation of Escherichia coli in Na2SO4 electrolyte using boron-doped diamond anode
✍ Scribed by Hongna Li; Xiuping Zhu; Jinren Ni
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 583 KB
- Volume
- 56
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
Electrochemical disinfection in chloride-free electrolyte has attracted more and more attention due to advantages of no production of disinfection byproducts (DBPs), and boron-doped diamond (BDD) anode with several unique properties has shown great potential in this field. In this study, inactivation of Escherichia coli (E. coli) was investigated in Na 2 SO 4 electrolyte using BDD anode. Firstly, disinfection tests were carried on at different current density. The inactivation rate of E. coli and also the concentration of hydroxyl radical ( • OH) increased with the current density, which indicated the major role of • OH in the disinfection process. At 20 mA cm -2 the energy consumption was the lowest to reach an equal inactivation. Moreover, it was found that inactivation rate of E. coli rose with the increasing Na 2 SO 4 concentration and they were inactivated more faster in Na 2 SO 4 than in NaH 2 PO 4 or NaNO 3 electrolyte even in the presence of • OH scavenger, which could be attributed to the oxidants produced in the electrolysis of SO 4 2-, such as peroxodisulfate (S 2 O 8 2-). And the role of S 2 O 8 2-was proved in the disinfection experiments. These results demonstrated that, besides hydroxyl radical and its consecutive products, oxidants produced in SO 4
2-electrolysis at BDD anode played a role in electrochemical disinfection in Na 2 SO 4 electrolyte.