2.4 Analytical methods
Influent sample of 5 L and effluent sample of 5 L
were collected from each grease trap to determine the
temperature, SS, pH, FOG, BOD, and surfactant [4].
Treatment efficiencies of domestic wastewater from
simple and modified grease traps were analyzed and
calculated in the percentages. The contaminant
removal in percentage was calculated by using an
Equation 1 [5].
% Removal = [(CInf – CEff) C⁄ Inf] × 100 (1)
where CInf is a contaminant concentration in
influent and CEff is a contaminant concentration in
effluent.