| 摘要 |
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. |
