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Table 1 Analytical data of the digestates from the primary and secondary digesters during stable operation (n = 5)

From: Process upsets in a full-scale anaerobic digestion bioreactor: over-acidification and foam formation during biogas production

 

Primary digester

Secondary digester

TS (%)

6.34 ± 0.54

4.98 ± 0.60

VS (% TS)

74.2 ± 0.53

68.2 ± 0.75

pH (−)

7.80 ± 0.15

7.93 ± 0.14

VFA/TIC (−)

0.19 ± 0.01

0.16 ± 0.01

NH4-N (g/L)

1.131 ± 153

1.680 ± 201

Acetate (mg/L)

126 ± 49.2

12.1 ± 11.8

Propionate (mg/L)

24 ± 5.76

10.7 ± 10.2

Butyrate (mg/L)

<1

<1