Steiner and Gec (1992) report that the introduction
of hydrogen peroxide into grease traps and
DAF units can significantly enhance performance
for O&G removal, largely through the nucleation of
very fine oxygen bubbles. It appears that where
chemicals are added to DAFs, the use of hydrogen
peroxide may benefit the process. In contrast, Travers
and Lovett (1985) found the use of carbon
dioxide and carbon dioxide/nitrogen gas mixtures
instead of air for DAF systems treating slaughterhouse
wastewater gave little improvement in
removal efficiencies, probably because of the extra
turbulence found in the separating vessel using CO2and larger bubble sizes, which depend on the gas
used