Photolysis of Hydrogen Peroxide, an Effective Disinfection System via Hydroxyl Radical Formation

Ikai, Hiroyo; Nakamura, Keisuke; Shirato, Midori; Kanno, Taro; Iwasawa, Atsuo; Sasaki, Keiichi; Niwano, Yoshimi; Kohno, Masahiro

doi:10.1128/aac.00751-10

Cited by 157 publications

(114 citation statements)

References 29 publications

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“…Later, the AOP concept has been extended to the oxidative processes with sulfate radicals (SO 4 have too short half-life (on the order of microseconds), so that the required detention times for disinfection are prohibitive due to extremely low radical concentrations [5]. When AOPs are applied for wastewater treatment, these radicals, as a powerful oxidizing agent, are expected to sufficiently destruct wastewater pollutants, and transform them to less and even non-toxic products, thereby providing an ultimate solution for wastewater treatment [6].…”

Section: Advanced Oxidation Processesmentioning

confidence: 99%

Advanced Oxidation Processes (AOPs) in Wastewater Treatment

2015

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Advanced oxidation processes (AOPs) were first proposed in the 1980s for drinking water treatment and later were widely studied for treatment of different wastewaters. During the AOP treatment of wastewater, hydroxyl radicals (OH·) or sulfate radicals (SO 4 ·− ) are generated in sufficient quantity to remove refractory organic matters, traceable organic contaminants, or certain inorganic pollutants, or to increase wastewater biodegradability as a pre-treatment prior to an ensuing biological treatment. In this paper, we review the fundamental mechanisms of radical generation in different AOPs and select landfill leachate and biologically treated municipal wastewater as model wastewaters to discuss wastewater treatment with different AOPs. Generally, the treatment efficiencies rely heavily upon the selected AOP type, physical and chemical properties of target pollutants, and operating conditions. It would be noted that other mechanisms, besides hydroxyl radical or sulfate radical-based oxidation, may occur during the AOP treatment and contribute to the reduction of target pollutants. Particularly, we summarize recent advances in the AOP treatment of landfill leachate, as well as advanced oxidation of effluent organic matters (EfOM) in biologically treated secondary effluent (BTSE) for water reuse.

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Section: Advanced Oxidation Processesmentioning

confidence: 99%

Advanced Oxidation Processes (AOPs) in Wastewater Treatment

2015

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“…Nonetheless, the total amount of ÁOH generated in 20 min was estimated to be approximately 169 lM. Our previous result using photolysis of H 2 O 2 as an ÁOH generation system suggested that 200-300 lM ÁOH yielded within 3 min would be needed to produce a [5-log reduction in S. aureus (Ikai et al 2010). Thus, the amount of ÁOH obtained in the present study would be sufficient to kill the bacteria within 20 min.…”

Section: Esr Analysis Of áOh and Colorimetric Determination Of H 2 Omentioning

confidence: 79%

Microbicidal action of photoirradiated aqueous extracts from wine lees

et al. 2016

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Wine lees, a major waste product of winemaking, is a rich source of polyphenolic compounds. LED-light irradiation at 400-nm elicited microbicidal activity of aqueous extract from wine lees (WLE) against Staphylococcus aureus, Pseudomonas aeruginosa, and Candida albicans, in addition to reactive oxygen species (ROS) formation, including hydroxyl radical (ÁOH) and hydrogen peroxide (H 2 O 2 ). Although treatment for 20 min of photoirradiation alone exerted bactericidal activity with a 2-to 3-log reduction, photoirradiated WLE for 20 min achieved a 5-log or greater reduction in viable S. aureus and P. aeruginosa cells. Regarding C. albicans, a 1-log reduction (90 % reduction) of viable cells was achieved by photoirradiated WLE for 40 min, whereas photoirradiation alone did not show any fungicidal effect. ROS analyses revealed that approximately 170 lM ÁOH and 600 lM H 2 O 2 were generated in photoirradiated WLE for 20 min. Because the bactericidal activity of photoirradiated WLE was abolished by ÁOH scavengers, ROS, especially highly oxidative ÁOH, may be responsible for the microbicidal activity of photoirradiated WLE. In addition to its microbicidal activity, WLE may act as an antioxidant as it exerted radical scavenging activity against 2,2-diphenyl-1-picrylhydrazyl, a stable free radical.

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“…• is also an ROS and has one unpaired electron in its structure, so it is apt to deprive other substances of an electron, thus oxidizing them (15). This makes HO…”

Section: Introductionmentioning

confidence: 99%