title: [The determination of the discrepancy between the mathematically ascertained and experimentally provable efficiency of UV facilities for water disinfection].
abstract: Using three UV-plants of different technical designs for water disinfection, we studied the conformity between experimental germ reduction using standard test organisms and calculated UV-doses under various water flow conditions. Taking into consideration the style of construction of the UV-plants, the irradiation area and the layer thickness were used as constant parameters for dose calculations. This was also employed for the irradiation intensity, since the experiments were performed for a relatively short period compared of the life span of the UV-irradiators. Both exposure time and water transmission were employed as variable parameters in the dose calculations and experimental procedures respectively. The calculated UV-dose and experimentally obtained germ reduction values were comparatively the same for two of the three UV-plants studied. However, no correlation was observed between the reduction of E. coli and the corresponding calculated UV-dose values. Therefore, the calculated UV-dose values for any given UV-plant should be considered to be relative and by no means absolute values. We are of the opinion that within a certain range of water flow rate and transmission, antimicrobial effectiveness of different UV-plants should be demonstrated independent of dose values, technical and other construction characteristics. The applicability of the UV-plants studied is discussed.
authors.affiliation: Abt. Hygiene und Medizinische Mikrobiologie, Universität Heidelberg.
authors.forename: G
authors.initials: G
authors.lastname: Leuker
authors.forename: V
authors.initials: V
authors.lastname: Hingst
mesh_terms: D001419:Bacteria / Q000254:growth & development / Q000528:radiation effects*; D002176:Candida albicans / Q000528:radiation effects*; D004203:Disinfection / Q000379:methods*; D004307:Dose-Response Relationship, Radiation; D004926:Escherichia coli / Q000528:radiation effects; D016982:Micrococcus luteus / Q000528:radiation effects; D011550:Pseudomonas aeruginosa / Q000528:radiation effects; D013211:Staphylococcus aureus / Q000528:radiation effects; D014466:Ultraviolet Rays; D014871:Water Microbiology; D014881:Water Supply / Q000592:standards*
vernacular_title: Untersuchungen zur Bestimmung der Diskrepanz zwischen der rechnerisch ermittelten und experimentell belegbaren Wirksamkeit von UV-Anlagen zur Wasserdesinfektion.