CONTROLLING THE SUPPLY OF BODYFEED TO A FILTER

摘要

A control system for controlling the supply of bodyfeed to a filter for removing solids from a liquid stream is described, the control system includes turbidity determining means (3) for determining turbidity of the liquid stream upstream of the filter, pressure drop change determining means (4a, 4b) for determining the rate of pressure drop change across the filter, and a controller (20) having dose change calculation means for calculating a dose change (24) from a determined turbidity and a determined rate of pressure drop change, and altering means for altering the supply of bodyfeed to the filter in accordance with a calculated dose change.