Experimental Degradation of Nonylphenol (Endocrine Disruptor) by Using Ultraviolet Irradiation in the Presence of Hydrogen Peroxide

Removal of tributyltin (TBT) from shipyard waters has been conducted in Virginia shipyards for over 2.5 years and has resulted in a 99% reduction of TBT discharged to coastal-estuarine waters. This has been achieved by conventional coagulation clarification for particulate TBT removal and removal of dissolved TBT using activated carbon. Although advances have been made in the understanding of TBT removal under various treatment conditions, TBT removal with the existing full-scale treatment plant to levels that would comply with a 50 parts per trillion (pptr) discharge limit are not possible. Results from study efforts that are currently ongoing suggest that the 50 pptr limit might be reached using ultraviolet irradiation or ozonation and that both processes would be substantially improved with the addition of hydrogen peroxide to promote hydroxyl radical formation.

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Decontamination Strategies for Filtering Facepiece Respirators (FFRs) in Healthcare Organizations: A Comprehensive Review

Annals of Work Exposures and Health ◽

10.1093/annweh/wxaa090 ◽

2020 ◽

Author(s):

Ashok Kumar Jena ◽

Jitendra Sharan

Keyword(s):

Hydrogen Peroxide ◽

Ethylene Oxide ◽

Time Use ◽

Ultraviolet Irradiation ◽

The Other ◽

Limited Time ◽

Healthcare Organizations ◽

Comprehensive Review ◽

Dry Heat ◽

Other Hand

Abstract Filtering facepiece respirators (FFRs) are made for one-time use. A massive shortage of FFRs is widespread during pandemic events and has forced many healthcare organizations to decontaminate them and re-use for a limited time. Many decontamination methods have been proposed for the decontamination of FFRs. This review highlights various aspects of decontamination methods available in the literature. Among various methods available, vaporized hydrogen peroxide, ultraviolet irradiation, and dry heat seem to be the most promising decontaminants for FFRs. On the other hand, microwave, bleach, ethylene oxide, alcohol, hydrogen peroxide liquid, sanitizing wipes, and soap and water are not recommended methods for FFR decontamination.

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Measurement of Residual Hydrogen Peroxide in Preformed Food Cartons Decontaminated with Hydrogen Peroxide and Ultraviolet Irradiation

Journal of Food Protection ◽

10.4315/0362-028x-46.12.1074 ◽

1983 ◽

Vol 46 (12) ◽

pp. 1074-1077 ◽

Cited By ~ 7

Author(s):

CATHERINE J. STANNARD ◽

JOHN M. WOOD

Keyword(s):

Hydrogen Peroxide ◽

Ultraviolet Irradiation ◽

Food Packaging ◽

Distilled Water ◽

Post Process ◽

Hot Air ◽

Residual Hydrogen ◽

Low Levels ◽

Uv C

A luminometric method was used to determine the levels of residual hydrogen peroxide present in preformed food packaging cartons after a decontamination process using sterile distilled water or 0.1, 1.0 or 30% (wt/vol) hydrogen peroxide and ultraviolet (UV-C, 254 nm) irradiation. The reduction of post-process peroxide levels in the cartons by irradiation or hot air was assessed. A residual hydrogen peroxide level of approx. 100 ppb could be obtained by spraying 0.2 ml of 0.1% hydrogen peroxide into the carton. Treatment with 1% hydrogen peroxide, with or without UV-C irradiation, gave residual levels approximately tenfold higher. The level was not reduced by UV-C irradiation but could be reduced by blowing hot air into the carton. 30% hydrogen peroxide sprayed into cartons could not be reduced by heat to levels below 100 ppb. Extremely low levels of residual hydrogen peroxide were detected when water was sprayed into cartons, both with or without UV-C irradiation.

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