the standard. The FOG values of effluent from both
grease traps were complied with the effluent building
standards. Many types of grease traps were used in
household or restaurants. The various designs of grease
trap were found to maximize the operation. The
treatment efficiency of grease trap is shown in Table 2
which indicated that the grease trap without enzyme
required 30 minutes - 24 hrs of HRT to give the 7-
92.7% of FOG removal. If the grease trap was
modified by adding the tube setter, aeration or making
chamber, it would enhance the treatment efficiency
around 70 - 80%. Furthermore, a clogging problem of
media inside the modified grease trap may be occurred
during operation due to the organic and FOG