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Table 3 Rate and specific methane yield for the psychrophilic dry anaerobic digestion of cow feces and wheat straw (35 % TS)

From: A start-up of psychrophilic anaerobic sequence batch reactor digesting a 35 % total solids feed of dairy manure and wheat straw

Cycle Cow feces TCOD (g kg−1) Cow feces TCOD/VS Feed TCOD/VS ratio SMY (NL CH4 kg−1 VS) SMY (NL CH4 kg−1 TCOD) Rate of CH4 production (NL CH4 kg−1 VS day−1)
1 147.6 1.3 1.3 184.6 ± 14.4 142.3 ± 11.1 8.8 ± 0.7
2 148.0 1.2 1.3 177.7 ± 24.4 139.0 ± 19.1 8.5 ± 1.2
3 195.2 1.6 1.4 213.9 ± 13.6 155.9 ± 9.9 10.2 ± 0.6
4 173.9 1.5 1.3 173.4 ± 17.8 128.6 ± 9.9 8.3 ± 0.9
5 173.9 1.5 1.3 198.2 ± 20.6 148.9 ± 10.9 9.4 ± 1.0
6 173.9 1.5 1.3 200.9 ± 9.9 144.2 ± 12.0 9.6 ± 0.5
7 184.2 1.6 1.4 186.3 ± 28.6 149.6 ± 25.8 8.9 ± 1.4
8 184.2 1.6 1.4 165.7 ± 5.4 125.1 ± 4.9 7.9 ± 0.3
9 184.2 1.6 1.4 191.3 ± 5.6 142.2 ± 3.9 9.1 ± 0.3
10 220.5 1.5 1.4 165.4 ± 9.8 109.8 ± 13.0 7.9 ± 0.5
11 220.5 1.5 1.4 209.1 ± 21.4 149.0 ± 10.9 10.0 ± 1.0
  1. The treatment cycle length in all cycles was 21 days
  2. The numbers given are averages and standard deviations of triplicates bioreactors
  3. The OLR was maintained at 3.0 g TCOD kg−1 inoculum day−1 equivalent to (2.2 ± 0.1 g VS kg−1 inoculum day−1)
  4. The SMY in Table 3 is based on the quantity of VS fed (cow feces and wheat straw)