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Table 1 Characteristics of the feed and performance of the MSU CSTR digester

From: Fungal fermentation on anaerobic digestate for lipid-based biofuel production

Characteristics of animal wastes (AD feedstock) Value
Total solids (%, TS)a 8.5 ± 2.2
Volatile solids (%, VS)a 7.2 ± 1.9
COD (mg/L)b 133,250.0 ± 21,173.0
TP (mg/L)c 670.0 ± 6.0
TN (mg/L)d 4487.0 ± 788.0
Digester performance Value
Operating temperature (°C) 40
HRT (days) 25
Biogas production (m3/day) 2919.9
Methane composition (% v/v) 60
Mixed wastes feeding the AD (wet tons/day) 76.1
Solid digestate generated (wet tons/day) 11.0
Liquid digestate generated (tons/day) 64.5
Electricity demand for the AD operation (MJ/day)e 4593.6
Thermal energy demand for the AD operations (MJ/day)f 8161.7
  1. aData is the average of 45 samples with standard deviation
  2. bData is the average of 8 samples with standard deviation
  3. cData is the average of 3 samples with standard deviation
  4. dData is the average of 9 samples with standard deviation
  5. eIt is for pumps and agitators used in the AD operation
  6. fThe thermal energy required by the AD unit was calculated by: mass of the wet mixed feed × specific heat of the wet mixed feed × (the digester temperature—the average temperature of the mixed feed) × (1 + 10%), where the average temperature of the mixed feed is 15 °C, the digester temperature is 40 °C, the amount of wet feed is 76,100 kg, the specific heat of the wet mixed feed is 3.9 kJ/kg °C, and 10% was the extra energy that needs to maintain the digester temperature besides heading the feed