Photodegradation of wastes in pollutants in aquatic environment / B.G. Oliver and J.H. Carey. : En13-5/85-56E-PDF

"Photocatalytic processes have considerable potential to contribute to the degradation of pollutants in the aquatic environment and in wastewater treatment. The sunlight irradiation of humic substances in natural waters has been shown to produce several reactant species including singlet oxygen, superoxide, hydroxylradical and hydrogen peroxide. These species can react with organic pollutants to cause oxidation and/or dechlorination of these chemicals. Biological components of natural waters such as algae can contain a significant fraction of certain contaminants and studies have shown that algae can photocatalyze the breakdown of several persistent organic compounds. Field studies are required to assess the importance of indirect photochemical processes to the breakdown of persistent organic chemicals such as PCB's, chlorobenzenes and pesticides. Since most of these chemicals do not absorb sunlight, in the past, they were usually considered to be resistent to photochemical breakdown. Heterogeneous photolysis using semiconductors such as titanium dioxide (anatase) has been shown to break down several organic and inorganic pollutants. Some mechanistic considerations as well as practical applications of this method for wastewater treatment are discussed. The process has considerable potential for treating wastewater containing cyanide and/or chlorinated organic chemicals"--Exec. summary.

Lien permanent pour cette publication :
publications.gc.ca/pub?id=9.847936&sl=1

• Format MARC XML
• Format MARC HTML

Demander des formats alternatifs