Biological sewage clarification - by flocculation of meshes of plastic networks regenerated by reverse flushing

摘要

Sewage is clarified by passing the effluent in turn through a settling tank where it is kept in contact with several net assemblies. Org. substances are removed from the sewage through decompsn. by microorganisms; they adhere to the net assemblies and are pptd. by flocculation. The net assemblies, which can be heated, are regenerated by passing a pressurised fluid through them in the reverse direction if they should have become clogged. This system has a high purificn. efficiency, and combines small space requirements with low expenditure. The treatment is easy to control.