AWWA ACE58296

Air bubbles that form in water treatment filters create headloss and can form wheneverthe total dissolved gas pressure exceeds the ambient hydrostatic solution pressure. Thelocation of potential bubble formation in filters can be predicted based on the clean bedheadloss with depth, flow rate, and influent total dissolved gas concentration. Bubbleformation within filters can be reduced if the ambient pressure within the filter wasincreased by greater submergence (water head above the media), lower hydraulic flowrate, or by use of a more porous media, these predictions were confirmed in bench-scaletesting. Bubbles trapped in the bed can be released by "burping", which can reduce theextent of headloss buildup. Burping is more significant at lower flow rates and with alower density, higher porosity and hydrophobic anthracite layer. Includes 12 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

06/15/2003

Number of Pages:

14

File Size:

1 file , 370 KB