title: [About the importance of chemical flocculation of wastewater in regard to hygienical aspects (microbiological and virological examinations in a wastewater treatment plant) (author's transl)].
abstract: In a small wastewater treatment plant corresponding samples from the intake and outtake of the chemical flocculation were chemically, microbiologically and virologically investigated and compared. It was found that both, the plate count and the number of coliforms, decreased about 90% to 95%. The phosphate content went down about 88%. The BOD5 reduction was ca. 80%, the COD reduction ca. 50%. Poliomyelitisviruses were found regularly in the intake but never in the outtake. Specially in regard to the high plate count- and virusreduction the chemical flocculation seems to be remarkable from the hygienical point of view not only for limnic but also for coastal waters.
mesh_terms: D004926:Escherichia coli / Q000302:isolation & purification*; D005427:Flocculation; D010710:Phosphates / Q000032:analysis; D017955:Poliovirus / Q000302:isolation & purification*; D012722:Sewage; D014867:Water / Q000032:analysis; D014871:Water Microbiology
chemical_list: D010710:Phosphates; D012722:Sewage; D014867:Water
vernacular_title: Uber die Bedeutung der dritten Reinigungsstufe aus hygienischer Sicht (Mikrobiologische und virologische Untersuchungen in einem Klärwerk).