Doppstadt Umwelttechnik GmbH products

The Doppstadt Screw Press 205 is designed for solid-liquid separation of organic waste. During this process the bio-available fraction of the input material is concentrated in the liquid phase (filtrate). The filtrate is then used as a substrate to produce biogas using wet fermentation. According to the application the retentate can be composted or directly used as RDF. Usually the filtrate is pumpable and can be diluted by adding process water if necessary. The throughput depends mainly on the input material, the feeding and further factors. It averages between 7 and 12 t/h with a maximum of up to 20 t/h.

The patented Wendelfilter is used for solid-liquid separation and thickening of suspensions, especially for fine separation of thin liquids. The low rpm of the machine ensure minimal energy costs, low noise emissions, and high dry matter content on a very small footprint. Due to the fine filter with a mesh size of 60 to 300µm the degree of separation is higher than that of a filter presses. The screw shaped scraper (Wendel) is surrounded by a perforated filter pipe. By means of suction, the filtrate is drawn through the filter medium. The filter cake that builds up inside the filter element is continuously cleaned off by the scraper and discharged on the top end of the unit. By variation of the Wendel speed suspensions with very low content of dry matter can be processed as well.