Method for removing scale from porous diffusion tiles

Details Method for removing scale from porous diffusion tiles Method for removing scale from porous diffusion tiles

1982-02-16

1983-09-06

Lindsay, Jr., Robert L.

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 21, 134 221, 134 28, 134 30, B08B 500

Patent

active

044027583

ABSTRACT:
A method for cleaning porous diffusion tiles used in systems for distributing oxygen or oxygen containing gas in water bodies is disclosed. The build-up of scale, which blocks the pores in such diffusion tiles, is removed by (1) purging the oxygen distribution system with a nonoxidizing gas such as nitrogen, (2) injecting substantially pure HCl gas through the system which removes the scale, and (3) purging the system again with the nonoxidizing gas before resuming flow of oxygen or oxygen containing gas. The use of a nonoxidizing purge gas before and after acid treatment prevents severe corrosion in the oxygen distribution system caused by the simultaneous presence of HCl gas and oxygen.

REFERENCES:
patent: 2684330 (1954-07-01), French
patent: 2686138 (1954-08-01), Klein
patent: 3522093 (1970-07-01), Woolman
patent: 3881872 (1975-05-01), Naono
Franklin, Water Works & Sewerage, "Purging Diffuser Plates with Chlorine", 6/1939, pp. 232-233.
Jackson, Water Works & Sewerage, "Maintaining Open Diffuser Plates with Chlorine", 9/1942, pp. 380-382.

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