Semnan University of Medical Sciences

Research and Technology Vice Chancellor

Matin, Atiyeh Rajabi and Yousefzadeh, Samira and Ahmadi, Ehsan and Mahvi, Amirhossein and Alimohammadi, Mahmood and Aslani, Hassan and Nabizadeh, Ramin (2018) A comparative study of the disinfection efficacy of H 2 O 2 /ferrate and UV/H 2 O 2 /ferrate processes on inactivation of Bacillus subtilis spores by response surface methodology for modeling and optimization. Food and Chemical Toxicology, 116. pp. 129-137. ISSN 02786915

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Abstract

Although chlorination can inactivate most of the microorganisms in water but protozoan parasites like C. parvum oocysts and Giardia cysts can resist against it. Therefore, many researches have been conducted to find a novel method for water disinfection. Present study evaluated the synergistic effect of H2O2 and ferrate followed by UV radiation to inactivate Bacillus subtilis spores as surrogate microorganisms. Response surface methodology(RSM) was employed for the optimization for UV/H2O2/ferrate and H2O2/ferrate processes. By using central composite design(CCD), the effect of three main parameters including time, hydrogen peroxide, and ferrate concentrations was examined on process performance. The results showed that the combination of UV, H2O2 and ferrate was the most effective disinfection process in compare with when H2O2 and ferrate were used. This study indicated that by UV/H2O2/ferrate, about 5.2 log reductions of B. subtilis spores was inactivated at 9299 mg/l of H2O2 and 0.4 mg/l of ferrate concentrations after 57 min of contact time which was the optimum condition, but H2O2/ferrate can inactivate B. subtilis spores about 4.7 logs compare to the other process. Therefore, the results of this research demonstrated that UV/H2O2 /ferrate process is a promising process for spore inactivation and water disinfection. KEYWORDS: Bacillus subtilis spores; Central composite design (CCD); Disinfection; Response surface methodology (RSM); UV radiation/ H2O2 /ferrate

Item Type: Article
Subjects: R Medicine > R Medicine (General)
Divisions: Faculty of Medical Sciences > School of Medicine
Depositing User: Mr Vahab Moshtaghi
Date Deposited: 30 Apr 2018 09:39
Last Modified: 21 May 2018 12:39
URI: http://eprints.semums.ac.ir/id/eprint/1335

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