Importance

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Abstract

An improved unit for removal of tannin and lignin from water is disclosed, which features a cylindrical tank containing a tannin/lignin-adsorbing resin bed and a distributor tube/water distributor assembly. The assembly comprises a distributor tube extending from an orifice in the upper portion of the tank to a lower distributor assembly, and a riser tube having an open end disposed near the lower distributor assembly and communicating with an upper distributor located beneath the surface of the resin. A water flow restrictor is provided in the lower distributor assembly, such that when water is passed downwardly through the distributor tube in a backwash mode, some of the water is injected into the riser tube. This causes the backwash water to flow into the resin bed at its lower portion and to carry resin up through the riser tube to the upper portion of the resin bed. In this way, the resin bed is more effectively regenerated by a subsequent supply of a brine solution than if the backwash water were only injected at the lower portion of the resin bed. This improved efficiency allows the tannin/lignin-adsorbing resin bed to adsorb tannins and lignins at significant and acceptable levels even where iron and suspended particulate matter are present in the ground or other inlet water stream.

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First Claim