AWWA ACE61701

Air bubbles can disrupt conventional coagulation and sedimentation processes by floatingcoagulant floc. This study explains the fundamental factors that lead to bubbleformation and corresponding floating floc during coagulation and sedimentation. Gas bubbles(causing the floating floc) can form whenever the total dissolved gas (TDG) pressure exceeds thelocal solution pressure, which can occur at localized minimum pressures during rapid mixing athigh fluid velocities. Very high rate rapid mixers can cause bubble formation and floating floceven in waters undersaturated with dissolved gas. The formation and stability of floating floc aredependent on many systems including water quality and plant operation, which can be optimizedto mitigate floating floc. A case study at a treatment plant afflicted by floating floc confirmed keyhypotheses. Includes 15 references, table, figures.

Product Details

Edition:

Vol. - No.

Published:

06/17/2005

Number of Pages:

18