Air duct block for air/water underdrain systems in gravity filte

Liquid purification or separation – Particulate material type separator – e.g. – ion exchange or... – With rehabilitation means

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210293, 210793, B01D 2424, B01D 2446

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active

051606143

ABSTRACT:
An air duct block for air/water underdrain systems in gravity filters comprising a row of interconnected air duct blocks positioned below the filtering media and extending transversely to the underdrain laterals. Each air duct block is in communication with at least one adjacent individual underdrain filter block to supply backwash gas thereto during backwashing operations, thereby supplying backwash gas to its associated lateral. Each air duct block is in further communication with at least one adjacent air duct block such that backwash gas flows between the interconnected air duct blocks and along the row of air duct blocks. This system supplies backwash gas to the entire underdrain system through a single pipe from a source of supply.

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