Backwashing method and device of filter

Abstract

The invention discloses a backwashing method of a filter, which solves a problem of low backwashing efficiency of traditional filters, a specific method is that a whirl cavity, a water collection cavity, a filtering medium collection and transfer cavity and a discharge cavity are all installed in the filter, so that a mixed liquor generates a strong centrifugal separation acting force after passing through the whirl cavity, the acting force results in not only applying a rubbing force on the filtering medium, but also effectively separating the filtering medium from oil and suspending impurities through their channels, namely, the oil and the suspending impurities are discharged from a tank via the water collection cavity, the washed filtering medium is sequentially returned back to the tank via the collection and transfer cavity and the discharge cavity, repeating in this cycle, the filtering medium can be completely washed; the invention also provides a device capable of implementing the method.

Description

technical field [0001] The invention relates to a filter backwashing method and oily sewage filtering equipment, in particular to a backwashing method and device with dual functions of washing and separating filter media. Background technique [0002] The walnut shell filter is a device that removes oil and suspended solids in oily sewage with lipophilic walnut shell as the filter medium. Because of its advantages of high filtration rate, strong sewage interception ability and low water washing strength, it was widely used in oil fields in the middle and late 1980s. After the walnut shell filled in the filter runs for a period of time, the gaps between the media and the surface are saturated with oil and suspended matter. In order to restore its filtration performance, it is necessary to periodically backwash and regenerate the walnut shell medium. The traditional method mainly uses mechanical agitation and backwashing to strengthen the scrubbing effect on the surface of wa...

AI Technical Summary

Problems solved by technology

Under the action of the backwash water and the agitator, the originally light walnut shells will churn up and down in the tank, and the tumbling walnut shells will then block the outlet screen, causing the backwash to hold back pressure and reduce the backwash flow, resulting in walnut The shell media cannot be cleaned effectively, which greatly limits the filtering performance of the walnut shell filter

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