00000nam 2200000za 4500 9.847936 CaOODSP 20241203113640 cr ||||||||||| 171128s1985 onca|||fo f000 0 eng d CaOODSP eng eng fre n-cn--- En13-5/85-56E-PDF Oliver, Barry G. Photodegradation of wastes in pollutants in aquatic environment [electronic resource] / B.G. Oliver and J.H. Carey. Photodegradation of wastes and pollutants in aquatic environment Burlington, Ont. : Environmental Contaminants Division, National Water Research Institute, Canada Centre for Inland Waters, [1985]. 20 p. : ill. NWRI contribution ; no. 85-56 "Division control no. ECD-65". Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references. "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. Includes abstract and management perspective in French. gccst Waste water gccst Water management Carey, John H. Canada. Environment Canada. National Water Research Institute (Canada) NWRI contribution ; no. 85-56 (CaOODSP)9.844121 PDF 2.18 MB https://publications.gc.ca/collections/collection_2017/eccc/En13-5-85-56-eng.pdf