• AWWA WQTC69371
Provide PDF Format

Learn More

AWWA WQTC69371

  • Developments in Dissolved Air Flotation
  • Conference Proceeding by American Water Works Association, 11/01/2008
  • Publisher: AWWA

$12.00$24.00


This paper examines significant developments in dissolved air flotation (DAF) that have occurredover the last 40 years. DAF processes are being designed and operated with shorter flocculationdetention times than have been used in the past. Fundamental concepts show that flocs of 20-50µm are optimum in size regarding the collisions and attachment of flocs to air bubbles in theDAF contact zone, and thus link flocculation practice to fundamentals. Floc-bubble aggregatescan rise and be removed in the DAF separation zone with one bubble attachment to flocs withsizes < 50 µm. Data are presented showing the effectiveness of DAF for treating low turbiditywaters containing total organic carbon (TOC) and for removing algae and Cryptosporidium oocysts. High rate DAFsystems are a recent development (over the last 10 years) with hydraulic loadings of 8-16 gpm/sf thatyield a small process footprint. These high rate processes have different hydraulic flow throughpatterns than conventional rate DAF that allow them to produce high quality clarified water. Includes 15 references, figures.

Related Products

AWWA WQTC71624

AWWA WQTC71624

Pipe Flow through Investigation: Determining Potential Water Quality Problems Involved with Switchin..

$12.00 $24.00

AWWA WQTC55016

AWWA WQTC55016

Inter-Agency Control of MTBE Contamination in a Multi-Use Reservoir..

$12.00 $24.00

AWWA IMT61451

AWWA IMT61451

The Changing Role of IT in Utilities..

$12.00 $24.00

AWWA MTC69768

AWWA MTC69768

Use of Advanced NOM Characterization Methods to Trace the Fate of Organic Contaminants from a Membra..

$12.00 $24.00