Fluid treatment apparatus
AssigneeWater Recovery PLC
InventorMalcolm Robert Snowball
Life of this patent
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Abstract
A fluid treatment apparatus comprises two titanium mesh filters (12,22) connected in series across a flow passage. Each filter (12,22) is irradiated by UV light from respective lamps (13a,13b,23a,23b), so as to kill any micro-organisms trapped on the filters. Backwashing means (18,19,28,19) are provided for backwashing each filter in succession whilst fluid flowing along the passage is filtered by the other filter. In this manner micro-organisms are unable to pass through the apparatus untreated.
Claims28
A fluid treatment apparatus comprising a flow passage, a filter element mounted across the flow passage for filtering fluid flowing along the passage between an inlet and an outlet of the passage, means for substantially disabling the filtration of the filter, means for irradiating the filter for a predetermined time period after the filtering action of the filter has been disabled, means for backwashing the filter after said time period has ended, and means for enabling the filtering action of the filter following backwashing.
A method of treating fluid comprising the steps of establishing a fluid flow along a flow passage through a filter disposed between an inlet and an outlet of the flow passage, substantially disabling further filtration by said filter, exposing the filter to radiation for a predetermined time period after filtration is disabled, backwashing the filter after said predetermined time period has ended, and subsequently enabling the filter, so that filtration continues.
Dependencies are inferred from the claim text.