Disadvantages of Batch Flow Digester
1. The irregular retention time leads to the intermittent gas production. So bigger
gasholders or the simultaneous/parallel digesters are required for continuous gas
production.
2. The addition of fermented slurry is a somewhat expensive process.
3. The battery of the digesters is sometimes emptied and recharged. So it is
expensive and labour intensive (Khan 2009).
4. Non-economical for rural areas.
3.7.1.2.2 Continuous Flow Digester
Continuous flow digesters require daily loading of biomass. Inside the digester, the
biomass digested by the hydraulic heat difference, between the substrate and
Fig. 3.6 Schematics and workflow of a batch flow digester. (Modified from Prakash et al. 2015)
80
S. Elangovan et al.
1. The irregular retention time leads to the intermittent gas production. So bigger
gasholders or the simultaneous/parallel digesters are required for continuous gas
production.
2. The addition of fermented slurry is a somewhat expensive process.
3. The battery of the digesters is sometimes emptied and recharged. So it is
expensive and labour intensive (Khan 2009).
4. Non-economical for rural areas.
3.7.1.2.2 Continuous Flow Digester
Continuous flow digesters require daily loading of biomass. Inside the digester, the
biomass digested by the hydraulic heat difference, between the substrate and
Fig. 3.6 Schematics and workflow of a batch flow digester. (Modified from Prakash et al. 2015)
80
S. Elangovan et al.