From the comparison study of the wastewater
treatment between the simple and the modified grease
traps, the results of modified grease trap were
treatment efficiencies of SS and FOG at 90% and the
treatment efficiency of BOD at 80%. They were better
than that of the simple grease trap at a flow rate of
wastewater of 2 L/min and a retention time of 10 hrs.
Moreover, treatment efficiencies of SS and FOG were
slightly higher than treatment efficiency of BOD.
Regarding these results, they showed that treatment
efficiencies of BOD and FOG from the grease traps
were irrelative. One reason may be due to the
characteristic of FOG is the one of organic matters
composed of saturated and unsaturated fatty acids
which are not soluble in water and are not easily
biodegradable as well as are removed from wastewater
by the floatation technique and proper HRT of grease
trap [23]. Meanwhile, the characteristic of BOD is a
measure of how much oxygen is required to
biologically decompose organic matter by
microorganism in the wastewater [4]. Thus, an organic
matter in term of BOD in wastewater was not
completely biodegraded by bacteria or microorganism
in the grease trap and then BOD was still remained in
an operation of this study [23]. It may be implied that