Sustainable Environment Research

Table 4 Nutrient and light metal concentration of feedstock (t₀) and digestate (t_f)

From: Improved biofertilizer properties of digestate from codigestion of brewer’s spent grain and palm oil mill effluent by manure supplementation

Concentration	Initial concentration (t₀)				Final concentration (t_f)
Concentration	A₀	B₀	C₀	D₀	A_f	B_f	C_f	D_f
Total N (g kg^− 1)	5.00^b	3.67^b	4.67^b	2.50^b	5.10^c	3.80^b	4.80^d	2.70^a
Ammonium N (g kg^− 1)	3.5^b	2.0^a	2.8^c	1.1^a	3.9^b	2.8^c	3.2^d	1.98^a
Phosphorus (mg kg^− 1)	1066^b	1086^b	1129^b	650^a	1133^c	1116^c	1311^d	665^a
Sulphur (mg kg⁻¹)	342^b	427^c	468^d	90^a	341^b	450^c	491^d	91.3^a
Potassium (mg kg⁻¹)	1321^b	1290^b	1301^b	400^a	1322^c	1315^b	1334^d	411.8^a
Calcium (mg kg⁻¹)	571^d	545^b	561^c	433^a	578^c	570^b	580^d	430.2^a
Magnesium (mg kg⁻¹)	625^b	621^b	623^b	2161^a	625^c	621^b	626^c	223.5^a

Similar superscript letter means not significantly different in mean (p > 0.05), while different superscript letters mean significantly different (p < 0.05); Total N – total nitrogen; A–D (Reactors)

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ISSN: 2468-2039

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