Therefore, the Ministry of Natural
Resources and Environment, Thailand has emphasized
the installation of grease traps to reduce the impact of
FOG in wastewater before draining into public water
sources. However, it has been found that the grease
traps currently used in houses are not effectively
reducing FOG before releasing to the public water
sources [2]. Generally, the grease traps can dispose
about 60% of FOG [3]. Hence, it is significant to study
the factors that influence on the operational efficiency
in FOG removal for maximum treatment of domestic
wastewater and reduction of the impacts on water body
and is environmental friendly.