Anaerobic Codigestion of Municipal Wastewater Treatment Plant Sludge with Food Waste: A Case Study
Table 3
Synergistic effect evaluation of codigestion of SS with PF, GT, and FW (mixture of PF : GT).
Substrates ratio
EMY
SD
Weighted EMY
Difference
Increase in EMY (%)
value
Synergistic effect
1% PF
199.6
20.6
195.7
3.9
2.0
0.9310
Not clear
2% PF
226.6
16.3
198.4
28.2
14.2
0.6106
Not significant
10% PF
383.1
22.9
220.3
162.8
73.9
0.0462
Synergistic
25% PF
537.5
12.3
261.3
276.2
105.7
0.0084
Synergistic
50% PF
616.8
30.2
329.6
287.2
87.2
0.0066
Synergistic
1% GT
200.8
2.6
195.1
5.16
2.7
0.9067
Not clear
2% GT
230.6
10.3
197.3
33.32
16.9
0.5423
Not significant
10% GT
317.3
14.8
214.5
102.8
47.9
0.0467
Synergistic
25% GT
413.2
10.1
246.7
166.3
67.4
0.0259
Synergistic
50% GT
561.3
16.9
300.8
260.5
86.6
0.0081
Synergistic
5% FW
433.7
72.7
205.2
228.5
111.4
0.0176
Synergistic
20% FW
508.9
70.1
241.8
267.1
110.4
0.0110
Synergistic
50% FW
632.8
16.1
315.2
317.6
100.8
0.0038
Synergistic
66.67% FW
603.3
6.7
352.4
250.9
71.2
0.0066
Synergistic
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.