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

Table 1

Elemental composition of solid cow manure and seaweed.

Metal	Solid cow manure (mg/kg)	Seaweed (mg/kg)
Fe	110	530
Al	40	178
B	5.2	13.1
Mo	0.39	0.14
Hg	0.007	0.012
Cu	4.7	1.4
Cr	0.23	0.78
As	0.04	0.87
W	0.01	0.02
Se	0.24	7.49
Co	0.33	0.20
Pb	0.12	0.99
P	830	265
S	630	1841
Zn	27	14
Cd	0.04	0.20
Mn	34	5.3
Ni	0.31	1.21
Na	1200	1872
Mg	930	562
Ca	2000	5616
K	5800	1092
Si	206	79
C	105	52
N		5.6
N-kj	0.62
C/N	16.9	9.3
TS (%)	20.6	24.1–31.2
VS (% of TS)	82.4	30.0–32.1