3.7.1 Classification of Anaerobic Digestion Technologies
3.7.1.1 Total Solid Content (Wet/Dry)
Based on the total solid content of the feed, the digester designs are classified into
wet and dry systems. TS content of wet reactors is 16%, and the TS content of dry
reactors ranges between 22% and 40%. Dry reactors are more advantageous than wet
reactors since it requires a smaller reactor volume and minimal energy. Because of
the dry nature, the digestate can be easily used as a fertilizer after digestion.
Fig. 3.3 Overall chemical
process of three different
stages of biogas production
Fig. 3.4 Conventional design of a biogas plant. (Modified from Bhardwaj and Das 2017)
78
S. Elangovan et al.
3.7.1.1 Total Solid Content (Wet/Dry)
Based on the total solid content of the feed, the digester designs are classified into
wet and dry systems. TS content of wet reactors is 16%, and the TS content of dry
reactors ranges between 22% and 40%. Dry reactors are more advantageous than wet
reactors since it requires a smaller reactor volume and minimal energy. Because of
the dry nature, the digestate can be easily used as a fertilizer after digestion.
Fig. 3.3 Overall chemical
process of three different
stages of biogas production
Fig. 3.4 Conventional design of a biogas plant. (Modified from Bhardwaj and Das 2017)
78
S. Elangovan et al.