Two-Stage Dry Anaerobic Digestion of Beach Cast Seaweed and Its Codigestion with Cow Manure

Table 2

Methane production in batch tests (BMP), leach bed reactor, and anaerobic two-stage processes.

Substrate	Process	Duration (days)	Methane yield (l/g VSadded)	Methane content (%)
Seaweed	BMP	38	0.17 ± 0.01	49
Solid cow manure	BMP	38	0.09 ± 0.01	38
Seaweed/solid cow manure	BMP	38	0.13 ± 0.01	48
Seaweed	Two-stage process	24	0.16 ± 0.02	41^a, 65^b
Seaweed/solid cow manure	Two-stage process	30	0.11 ± 0.01	42^a, 43^b
Solid cow manure	Leach bed process	77	0.14 ± 0.01	48

aThe methane content in the leach bed reactor.
bThe methane content in the UASB reactor.
Ratio of substrate mix: 1 : 1 based on g VS.