Utilization of Biodiesel By-Products for Biogas Production

Table 1

Analysis results of macroelements, carbon and nitrogen in crude glycerol from different feedstocks (BDL indicates values that are below the detection limit for the corresponding analytical method) [25].

Feed stocks	Ida Gold Mustard	Pac Gold Mustard	Rapeseed	Canola	Soybean	Crambe	Waste vegetable oils
Calcium, ppm	11.7 ± 2.9	23.0 ± 1.0	24.0 ± 1.7	19.7 ± 1.5	11.0 ± 0	163.3 ± 11.6	BDL
Potassium, ppm	BDL	BDL	BDL	BDL	BDL	216.7 ± 15.3	BDL
Magnesium, ppm	3.9 ± 1.0	6.6 ± 0.4	4 ± 0.3	5.4 ± 0.4	6.7 ± 0.2	126.7 ± 5.8	0.4 ± 0
Phosphorus, ppm	25.3 ± 1.2	48 ± 2.0	65 ± 2.0	58.7 ± 6.8	53.0 ± 4.6	136.7 ± 57.7	12.0 ± 1.5
Sulfur, ppm	21.0 ± 2.9	16.0 ± 1.4	21.0 ± 1.0	14.0 ± 1.5	BDL	128.0 ± 7.6	19.0 ± 1.8
Sodium, % wt	1.17 ± 0.15	1.23 ± 0.12	1.06 ± 0.07	1.07 ± 0.12	1.2 ± 0.1	1.10 ± 0.10	1.40 ± 0.16
Carbon, % wt	24.0 ± 0.00	24.3 ± 0.58	25.3 ± 0.58	26.3 ± 0.58	26.0 ± 1	24.0 ± 0.00	37.7 ± 0.58
Nitrogen, % wt	0.04 ± 0.02	0.04 ± 0.01	0.05 ± 0.01	0.05 ± 0.01	0.04 ± 0.03	0.06 ± 0.02	0.12 ± 0.01