Pre-Treatment of Separately Collected Biowaste as a Way to Increase Methane Production and Digestate Stability

To produce a valuable final product from anaerobic digestion (AD), one of the preferred methods organic recycling, high quality feedstock must be ensured. In this study, separately collected real biowaste (B) was used, consisting 90% food waste and 10% green waste. The priority issues AD are both methane production (MP) organics removal efficiency (as matter, OM dissolved organics, DCOD), which may improved after pre-treatment. effect hydrothermal pre-treatment (BHT) enzymatic additives (BE) on MP in mesophilic (37 °C) conditions analyzed. assess adequacy application, without treatment (BWT) used. Pre-treatment prior to affected maximal MP, effectiveness DCOD, kinetic parameters these processes. For BWT, cumulative reached 239.40 ± 1.27 NL/kg OM; coefficient (kCH4) initial rate (rCH4) were 0.32 0.02 d−1 76.80 1.10 NL/(kg OM·d), respectively. After pre-treatment, BHT (253.60 1.83 OM) 6.3% higher than BWT. However, highest found for BE, 268.20 1.37 compare, it increased by 12.1% 5.5% with BWT BHT, BHT:kCH4 0.56 vs. 0.34 (BE); rCH4 141.80 OM·d) 89.80 0.50 (BE). similarly use an additive. kinetics (rOM, kOM) (rCH4, kCH4). and, consequently, its lowest content obtained BE means that used most efficiently, which, turn, result obtaining more stable digestive system.