Patent ID: 7922904

Claim:
An upward-flow manganese contact column comprising: a column body having a manganese catalyst packed layer having granular manganese catalysts packed therein; a chamber formed at the bottom of the column body for allowing raw water to flow into the chamber; and a plurality of dispersion nozzles provided at an upper face of the chamber for feeding raw water to the manganese catalyst-packed layer, wherein each dispersion nozzle comprises an umbrella portion above a perpendicular nozzle body, wherein a lower end of the umbrella portion is configured to be elongated below an upper end of the nozzle body, wherein each of the plurality of dispersion nozzles further comprises a mortar-shaped concave portion surrounding the perpendicular nozzle body, and is configured so that raw water is supplied through a gap between the lower end of the umbrella portion and mortar-shaped concave portion.