Comparative Inactivation of <i>Bacillus subtilis</i> Spores Using a DBD-Driven Xenon Iodide Excilamp and a Conventional Mercury Lamp

Гуйван, М. М.; Kamikozawa, Takashi; Kurokawa, Hisayoshi; Motomura, Hideki; Kadowaki, Kazunori; Jinno, Masafumi

doi:10.1109/tps.2010.2044588

Cited by 16 publications

(11 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unsurprisingly, depending on the values of these parameters, different characteristics of the discharge and performance of the reactor can be achieved; this fact has been already evidenced for different DBD reactors, e.g., DBD-driven ozone generators [10], precipitators [11], and ultraviolet (UV) excilamps [12].…”

Section: Introductionmentioning

confidence: 99%

“…This paper is mainly focused on DBD-driven excilamps, which are high efficiency and environmentally friendly UV sources, with the potential to replace the traditional mercury-based UV lamps [12], for example, in drinking water treatment applications [13]. One of the challenges for this technology to be massively adopted is the optimization and management of the overall lamp-supply system.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimizing the Operation of DBD Excilamps

Florez¹,

Díez²,

Piquet³

2016

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

Dielectric barrier discharge (DBD) excimer lamps are efficient and environmentally friendly sources of ultraviolet (UV). One of the challenges for this technology to be massively adopted is the optimization and effective management of the overall lamp-supply system. Accordingly, a methodology to study the impact of the operating point over the performance and operation of a DBD UV excilamp is developed and experimentally validated. The DBD operating point is parametrically adjusted by means of the power supply current with three independent variables: intensity, frequency, and duty cycle. This methodology allows the determination of the optimal operating point for the particular excilamp under study. These supplying conditions will be later achieved by means of a dedicated electrical generator, which has to be especially designed according to these specifications. It is found that an increment in the current intensity has a positive impact on the lamp efficiency and also leads to the existence of more filamentary discharges. Also, a relation between the energy of the pulse supplied to the DBD and the reactor efficiency can be established. For certain levels of UV power, energy savings on the reactor higher than 50% are attained by proper selection of the operating point.Index Terms-Current control, dielectric barrier discharge (DBD), excimer lamp, ultraviolet (UV).

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimizing the Operation of DBD Excilamps

Florez¹,

Díez²,

Piquet³

2016

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

show abstract

“…[9] Inactivation experiments with Bacillus subtilis spores also demonstrated the high efficiency of XeBr [10] and XeI excilamp (253 nm). [11] Wang et al [12] have studied the disinfection effects of VUV and UV radiation on B. subtilis spores at 172 (Xe 2 excimer lamp), 222 (KrCl excilamp) and 254 nm (low-pressure Hg lamp) and found Xe 2 excimer lamp was the least efficient, while the KrCl excilamp was more efficient than a Hg lamp. Further, a KrCl excilamp was also used for evaluation of inactivation of E. coli at high initial populations on agar surfaces and in aqueous media.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic-based inactivation ofE. coliby UV 282 nm XeBr Excilamp

Matafonova

Batoev

Linden

2013

Journal of Environmental Science and Health, Part A

View full text Add to dashboard Cite

The impact of suspended TiO2 particles on the efficiency of UV inactivation of E. coli by XeBr excilamp (282 nm) was assessed using direct and integrating sphere spectroscopy for absorbance measurements in the calculations of UV doses. Complete disinfection (no quantifiable E. coli colonies) was observed at 30 (0.25 g/L of TiO2) and 40 mJ/cm(2) (0.1 g/L of TiO2), whereas UV alone and the treatment in the presence of 0.5 g/L of TiO2 produced tailing in the dose-response curves. The optimum concentration of TiO2 was found to be 0.25 g/L, which correlates with the highest •OH exposure (CT value) and steady state concentration of •OH. This study demonstrates the importance of proper calculation of UV dose and inclusion of •OH exposure effects when reporting results from disinfection studies using technologies with multiple modes of inactivation such as with UV/TiO2.

show abstract

“…According to the data in [4], a KrCl exciplex lamp is the most effective for inactivation of Bacillus subtilis spores compared with a Xe 2 exciplex lamp (172 nm) and a low-pressure mercury lamp (254 nm). The bactericidal effect of XeI exciplex lamps (253 nm) was studied for the same spores [5]. Some of the most promising modern technologies for water disinfection are technologies based on combination oxidation processes, or AOPs (Advanced Oxidation Processes).…”

Section: Introductionmentioning

confidence: 99%

Impact of scattering of UV radiation from an exciplex lamp on the efficacy of photocatalytic inactivation of Escherichia coli cells in water

2012

View full text Add to dashboard Cite

UDC 535.36We have used integrating-sphere UV spectroscopy to study scattering of radiation from an XeBr exciplex lamp (282 nm) by nanoparticles of a photocatalyst (TiO 2 ) and Escherichia coli CN13 cells. We have demonstrated that we must take into account scattered radiation in calculating the UV doses for disinfection of water in the presence of suspended TiO 2 particles. We have established that using the absorption intensities for the water to be disinfected in the dose calculation, obtained without taking into account the intensity of scattering of the radiation, leads to the actual dose exceeding the calculated dose by 5.2% to 69.4%. Total inactivation of the cells (from the absence of colony-forming units (CFU) after incubation of the irradiated aqueous suspension) was achieved at a UV radiation dose of 30 and 40 mJ/cm 2 and TiO 2 concentration of 0.25 and 0.10 g/L. The optimal concentration of TiO 2 in water determined was 0.25 g/L, which corresponds to the maximum concentration of hydroxyl radicals and the rate of their formation.

show abstract

Comparative Inactivation of Bacillus subtilis Spores Using a DBD-Driven Xenon Iodide Excilamp and a Conventional Mercury Lamp

Cited by 16 publications

References 16 publications

Optimizing the Operation of DBD Excilamps

Optimizing the Operation of DBD Excilamps

Photocatalytic-based inactivation ofE. coliby UV 282 nm XeBr Excilamp

Impact of scattering of UV radiation from an exciplex lamp on the efficacy of photocatalytic inactivation of Escherichia coli cells in water

Contact Info

Product

Resources

About