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Table 2 Sludge characteristics (undiluted sludge) (mean ± SD) and some basic parameters of the digestions plants the inocula were derived from [50,51,52,53,54]

From: Formation of phenylacetic acid and phenylpropionic acid under different overload conditions during mesophilic and thermophilic anaerobic digestion

Parameter Mesophilic inoculum Thermophilic inoculum
Reactor capacity (m3) 1350 900
Sampling point Effluent Reactor outlet
Operation temperature (°C) 39 (0.2) 53 (0.3)
pH 7.36 (0.21) 7.9 (0.44)
Total solids (TS) (g 100 g−1 FW) 2.2 (0.04) 26.2 (2.0)
Volatile solids (VS) (g 100 g−1 TS) 61.0 (1.89)  
NH4-N (mg N kg−1) 1385 (128) 3200 (460)
Acetate (g kg−1) < 0.1 1.9 (1.52)
Propionate (g kg−1) < 0.1 1.3 (1.15)
Methanogenic community dominated by Methanosaeta sp. Methanothermobacter sp., Methanoculleus sp.
  1. FW fresh weight