3.1 Effect of media ratio on the treatment efficiency
of domestic wastewater in a modified grease trap
Fig. 2 shows the treatment efficiencies of domestic
wastewater in a modified grease trap with different
arrangement ratios of media; 5 cm diameter of Mon
brick: 1 cm diameter of gravel: 3 cm diameter of Mon
brick, respectively. All media ratios affected the
treatment efficiency of a modified grease trap, they
showed that FOG removal was more than 75%, while
pH removal was as little as 0.71 – 7.2%. Moreover,
media ratio of 1:2:1 was the highest efficiency in FOG
removal of 97.55%. However, with the same ratio of
media, BOD removal was only 52%. At media ratio of
1:1:2, the efficiency of SS, BOD, and FOG removal
was approximately 80% and given that it was the
optimal media thickness for microorganism attachment
that degraded the organic matters in wastewater