86
Figure 5.10 shows the process route of the biogas power plant using rice straw
feedstock, which is located at Fazilka in Punjab, India. Rice straw is fed into a chopper to be sheared off. The sheared rice straw is mixed with 25% cow dung in weight
and pumped into the first stage 2000-m
3
digester, which is maintained at
35 °C. Retention time (RT) of the substrate in the first anaerobic digestion (AD)
stage is 20 days and then conveyed into the second-stage digester, also 2000 m
3
and
maintained at 35 °C with an RT of 20 days. The biogas is collected through a
Fig. 5.9 Schematic diagram of the two-stage AD
Gas
storage
Rice
Straw
Cow dung
Chopper
Solid
Fertilizer
Liquid
Fertilizer
Mixer
Digester 1
Press
Refinery
Digester 2
Biogas
Slurry recycle
Solid digestate
Liquid
digcstate
Power
plant
Electricity
and Heat
Fig. 5.10 Process route of AD power plant in Fazilka, Punjab, India
N. V. C. Ngan et al.
Figure 5.10 shows the process route of the biogas power plant using rice straw
feedstock, which is located at Fazilka in Punjab, India. Rice straw is fed into a chopper to be sheared off. The sheared rice straw is mixed with 25% cow dung in weight
and pumped into the first stage 2000-m
3
digester, which is maintained at
35 °C. Retention time (RT) of the substrate in the first anaerobic digestion (AD)
stage is 20 days and then conveyed into the second-stage digester, also 2000 m
3
and
maintained at 35 °C with an RT of 20 days. The biogas is collected through a
Fig. 5.9 Schematic diagram of the two-stage AD
Gas
storage
Rice
Straw
Cow dung
Chopper
Solid
Fertilizer
Liquid
Fertilizer
Mixer
Digester 1
Press
Refinery
Digester 2
Biogas
Slurry recycle
Solid digestate
Liquid
digcstate
Power
plant
Electricity
and Heat
Fig. 5.10 Process route of AD power plant in Fazilka, Punjab, India
N. V. C. Ngan et al.