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Table 1 Physicochemical characteristics of experimental mixtures

From: Improved biofertilizer properties of digestate from codigestion of brewer’s spent grain and palm oil mill effluent by manure supplementation

BioreactorInitial (feed stock)Final (digestate)Cumulative biogas yield (mL g−1 VS)Methane yield (mol %)
TS (%)VS (%)pHTS (%)VS (%)pH
A25.4 ± 0.15d8.1 ± 0.10d7.3 ± 0.10b9.6 ± 0.10a3.8 ± 0.21a5.6 ± 0.06b31089.9
B21.6 ± 1.00b7.3 ± 0.10b6.9 ± 0.10a13.5 ± 0.10c4.6 ± 0.10b5.3 ± 0.10a19475.7
C23.4 ± 0.10c7.9 ± 0.10c7.4 ± 0.10b11.2 ± 0.10b3.8 ± 0.10a5.4 ± 0.10a24181.1
D (control)19.0 ± 1.00a6.9 ± 0.10a6.8 ± 0.10a17.1 ± 0.10b6.6 ± 0.10c5.2 ± 0.10a4159.3
BSG alone19.0 ± 0.0814.2 ± 0.037.1 ± 0.0115.3 ± 0.119.5 ± 0.176.1 ± 1.003544.4
POME alone15.9 ± 0.154.9 ± 0.015.6 ± 0.1013.9 ± 0.064.0 ± 0.095.0 ± 0.122737.5
  1. Similar superscript letters mean not significantly different in mean (p > 0.05), while different superscript letters mean significantly different (p < 0.05); A—D indicate bioreactors with different waste composition (n = 3)