Filtration and flocculating filtration. (Filtration und Flockungsfiltration)

摘要

Filtration of the sewage effluents of secondary sedimentation tanks serves to reduce the concentration of filtrable materials and to remove substances contained or adsorbed therein, e.g., heavy metals, oxygen-depleting substances, nitrogen and phosphorus compounds, and AOX-relevant substances. On the other hand, filtration is not a compensation for insufficient secondary treatment. The filter capacity depends on the types of substances to be filtered. In continuous operation, the upper limit will be about 20-40 mg/l. Higher capacities are possible for short periods of time. For further reduction of phosphates, filtration is supplemented by filtration and flocculation (flocculating filtration). (orig./EF) (ERA citation 20:006579)