title: [Qualitative and quantitative determination of bacterial populations in an aquatic environment. 8. Variation of the species spectrum during a drinking-water treatment process].
abstract: Water treatment processes such as aeration, gravel filtration, ozonation, activated-carbon filtration and chlorination causes variation in the number of bacteria as well as the development or die off of specific species. The number of bacteria was always reduced to a large extent if ozone or chlorine were applied whereas after filtration process often an increasing number of bacteria could be observed in the effluent. Despite of the differing bacterial counts a reduction of the variety of species was found during all treatment process. Whereas the raw water contained a heterogeneous spectrum of copiotrophic and oligotrophic bacteria the treated water contained mainly slow growing oligotrophic bacteria which didn't express any physiological activities.
mesh_terms: D001419:Bacteria / Q000302:isolation & purification*; D002713:Chlorine; D005374:Filtration / Q000379:methods; D005417:Flavobacterium / Q000302:isolation & purification; D005618:Fresh Water; D006090:Gram-Negative Bacteria / Q000302:isolation & purification; D006094:Gram-Positive Bacteria / Q000302:isolation & purification; D010126:Ozone; D011549:Pseudomonas / Q000302:isolation & purification; D013045:Species Specificity; D014871:Water Microbiology; D014881:Water Supply
chemical_list: D002713:Chlorine; D010126:Ozone
vernacular_title: Qualitative und quantitative Bestimmung von Bakterienpopulationen aus aquatischen Biotopen. 8. Mitteilung: Variation des Artenspektrums im Verlauf einer Trinkwasseraufbereitungsanlage.