Characteristics of OBC.

Characteristics	Values
Yield (%)	37.2
Ash (%)	5.18
pHPZC	2.23
Total acidity (mmol g−1)	2.012
O (%)	27.78
Na (%)	0.083
Mg (%)	0.083
Al (%)	0.22
P (%)	1.575
S (%)	7.866
K (%)	22.52
Ca (%)	17.54
Fe (%)	1.41
Cu (%)	0.182