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

AMB Express

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

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

The treatment cycle length in all cycles was 21 days
The numbers given are averages and standard deviations of triplicates bioreactors
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)
The SMY in Table 3 is based on the quantity of VS fed (cow feces and wheat straw)