Experimental analysis on the effects of trace metals as micronutrients in enhancing biomethane production

Sustainable Energy Research

Table 1 Micronutrients present in the substrates

Micronutrients	Unit	Cow dung alone	Food waste alone	Sample blank: food waste: cow dung
P	%	0.64	0.35	0.10
K	%	0.17	0.13	0.01
Ca	mg/100 g	183.5	200	153
Mg	mg/100 g	143	78.8	67.5
Zn	mg/100 g	5.72	1.4	0.70
Cu	mg/100 g	7.24	0.2	5.68
Fe	mg/100 g	134.24	1.1	71.2