Organic Waste Recycling

194 Organic waste recycling: technology and management

Fermentation time (days) 20 29 14 11-20 21

CH

content in 4

gas (%) 64 - - - -

(°

C)

• 
  
  
  
  • 
    
    
    
    • 45-50 20-26.2
    
    
    
    
  
  
  
  

Temperature (°

F)

• 
  
  
  
  • 
    
    
    
    • 113-112 68-79
    
    
    
    
  
  
  
  

m

3 /kg

0.37-0.61 0.5 0.5 0.32 0.38

Biogas production per unit weight of dry solids^3 ft

/lb

5.9-9.7 8 8 5.1 6

Raw materials Sheep manure

d

Table 4.21 Yield of biogas from various waste materialsForage leaves Sugar beet leaves Algae Nightsoil

a(continued)

a Compiled by NAS (1977) b Based on total solids c Based on volatile solids fed d Includes both feces and urine e Animals on growing and finishing rations f Based on volatile solids destroyed. On the basis of conversion efficiencies, these results may be expressed as 4.0-4.7 ft

3 /lb

dry solids added or 0.26-0.30 m

3 /kg

Note: Some of the reported values are higher than the theoretical value of 0.35 m

3 CH

/kg COD given in Equation 4.10 and 4

care must be taken in applying these data in practices