초록 ▼

A control system for controlling a backwash operation in normal and high flow operating modes is provided in a traveling bridge filter having a filter basin; a filter media bed; a filtrate channel; a traveling bridge adapted to traverse the filter basin with a backwash hood suspended therefrom; a pr

A control system for controlling a backwash operation in normal and high flow operating modes is provided in a traveling bridge filter having a filter basin; a filter media bed; a filtrate channel; a traveling bridge adapted to traverse the filter basin with a backwash hood suspended therefrom; a programmable logic controller; a reference sensor and five spaced water level sensors. The controller and the sensors control the backwash operation by sensor functions which differ between the normal and high flow operating modes.

대표청구항 ▼

[ What is claimed is:] [1.] In a control method for a backwash operation in a traveling bridge filter having a filter basin; a filtrate channel; a filter media bed; a traveling bridge adapted to traverse the filter basin with a backwash hood suspended therefrom; and at least one backwash pump adapte

[ What is claimed is:] [1.] In a control method for a backwash operation in a traveling bridge filter having a filter basin; a filtrate channel; a filter media bed; a traveling bridge adapted to traverse the filter basin with a backwash hood suspended therefrom; and at least one backwash pump adapted to supply backwash water in an upward direction through the filter bed during backwash operation; the improvement comprising:a) utilizing a first plurality of water level sensors in said filter basin to control backwash operation start, stop and resume functions in a normal flow operating mode; andb) utilizing certain of said first plurality of water level sensors to said filter basin and at least one additional water level sensor to control backwash start, stop and resume functions in a high flow operating mode, wherein said at least one additional water level sensor is by passed in said normal flow operating mode and at least one of said first plurality of water level sensors is bypassed in said high flow operating mode.