Method of improving the operation of backwashable fixed beds formed of granular materials

摘要: A method of improving the operation backwashable fixed beds formed granular materials and used during purification waste water sewage or treatment, wherein bed is conditioned a last step backwashing by filling with liquid for predetermined time duration. The contains distributed as uniformly possible therein at least one substance which in presence catalytically triggered decomposition reaction gives off gaseous component thereafter to be treated filtered.