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Abstract

A method for removal of solids in a water treatment system having multiple filters, each filter comprising an air backwash system and a water backwash system, comprising a series of steps to enable two filters to be in some stage of the backwash process at the same time thereby reducing the time the filter is out of service. The continuous cycling of the backwash method is characterized by a continuous cycle of backwashing that backwashes two filters simultaneously. The backwashing method requires three steps, an air-only backwash, an air/water bashwash and a water-only or rinse backwash. In this method, as one filter is at the water-only backwash stage, the backwash cycle of a second filter is started so that the second filter is air/water backwashed while the first filter is at the water-only backwashed stage. Depending on the valve actuator used to open and close the backwash air and water valves, each filter in a series of filters is out of the filtration process for only about 2 to 15 minutes, thereby minimizing downtime and disruption of the filtration process necessary to restore the capacity of the filters caused by buildup of solids. This enables the filters to operate at a high level of solid/hydraulic loading such as caused by storm water surges.

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