Table 3: Synergistic effect evaluation of codigestion of SS with PF, GT, and FW (mixture of PF : GT).

Substrates ratioEMYSDWeighted EMYDifferenceIncrease in
EMY (%)
valueSynergistic effect

1% PF199.620.6195.73.92.00.9310Not clear
2% PF226.616.3198.428.214.20.6106Not significant
10% PF383.122.9220.3162.873.90.0462Synergistic
25% PF537.512.3261.3276.2105.70.0084Synergistic
50% PF616.830.2329.6287.287.20.0066Synergistic
1% GT200.82.6195.15.162.70.9067Not clear
2% GT230.610.3197.333.3216.90.5423Not significant
10% GT317.314.8214.5102.847.90.0467Synergistic
25% GT413.210.1246.7166.367.40.0259Synergistic
50% GT561.316.9300.8260.586.60.0081Synergistic
5% FW433.772.7205.2228.5111.40.0176Synergistic
20% FW508.970.1241.8267.1110.40.0110Synergistic
50% FW632.816.1315.2317.6100.80.0038Synergistic
66.67% FW603.36.7352.4250.971.20.0066Synergistic

EMY: experimental methane yield (mL/g ); SD: standard deviation; and weighted EMY: weighted average of experimental methane yield for cosubstrates.
Percentage of food wastes (PF, GT, and FW) mixed with SS.