초록 ▼

A method of backwashing a filter includes a) supplying a backwash liquid via a conduit toward one end of a filter bed; b) aspirating air into the backwash liquid upstream of the bed; c) introducing a mixture of air and backwash liquid into the filter bed at the one end thereof; and d) expelling back

A method of backwashing a filter includes a) supplying a backwash liquid via a conduit toward one end of a filter bed; b) aspirating air into the backwash liquid upstream of the bed; c) introducing a mixture of air and backwash liquid into the filter bed at the one end thereof; and d) expelling backwash water and air from an opposite end of the filter bed. A related filter system includes a filter basin having a bed of filter media material therein; a filtrate channel proximate the basin; at least one tubular underdrain header in the bed and in fluid communication with the filtrate channel; and a backwash pump having a backwash water supply conduit selectively engageable with the underdrain header for supplying backwash liquid to the bed. The backwash water supply conduit includes a nozzle for aspirating air into the supply conduit at a location between the backwash pump and the bed.

대표청구항 ▼

[ What is claimed is:] [1.] A method of backwashing a filter comprising:a) supplying a backwash liquid toward one end of a filter bed by means of a backwash pump and a supply conduit;b) providing a nozzle venturi in said supply conduit and aspirating air into the backwash liquid in said supply condu

[ What is claimed is:] [1.] A method of backwashing a filter comprising:a) supplying a backwash liquid toward one end of a filter bed by means of a backwash pump and a supply conduit;b) providing a nozzle venturi in said supply conduit and aspirating air into the backwash liquid in said supply conduit, upstream of the bed;c) introducing a mixture of air and backwash liquid into the filter bed at said one end thereof; andd) expelling backwash liquid and air from an opposite end of the filter bed by locating a hood over an area of the filter bed being backwashed, and drawing backwash liquid, air and debris into said hood from said filter bed.