Waste Management abstract Screenings from municipal sewage treatment plants have increased in importance in recent years, particularly
in Germany, where laws prohibit depositing of screenings in landfill. This paper presents basic
investigations of sewage screenings, especially the structure and dewatering behavior. Two standard
experiments are conducted. First, the relationship between pressure and water content is determined.
Secondly the flow resistance as a function of pressure is evaluated. The results help to derive simulation
models in order to understand how the material behaves inside a wash press.