Method and apparatus for treating water and controlling effluent surges produced by disc and drum filters

摘要

A disc filter is provided having a controller for controlling effluent surges that are produced by the disc filter. The method entails sensing one or more process variables that are a function of the effluent, and based at least in part on the sensed process variables, the disc filter controls the flow of effluent in order to control or minimize effluent surges.

主权项

1. A process for filtering water with a disc filter and for controlling a flow of effluent produced by the disc filter and generally reducing flow surges in the filtered effluent produced by the disc filter, the process comprising:
a. directing influent water into the disc filter and into an interior of one or more rotary filter discs that form a part of the disc filter; b. filtering the influent water by directing the influent water from the interior of the rotary filter discs through one or more filters associated with the rotary filter discs thereby producing the filtered effluent; c. controlling the flow of the effluent produced by the disc filter by:
i. sensing one or more process variables that relates to the flow of the effluent;ii. based at least in part on the one or more sensed process variables, controlling the flow of the effluent by implementing the following control functions at various times in the process:
1. rotating the rotary filter discs only one revolution or less without backwashing the filters; andat least one of2. rotating the rotary filter discs only one revolution or less while backwashing the filters,3. rotating the rotary filter discs more than one revolution at a first speed without backwashing the filters,4. rotating the rotary filter discs for only one revolution or more at said first speed while backwashing the filters,5. rotating the rotary filter discs only one revolution or more at a second speed that is faster than said first speed without backwashing the filters,6. rotating the rotary filter discs only one revolution or more at said second speed while backwashing the filters, and7. rotating the rotary filter discs only one revolution or more while periodically backwashing the filters.