A potential phosphorous fertilizer for organic farming: recovery of phosphorous resources in the course of bioenergy production through anaerobic digestion of aquatic macrophytes

Table 4 PTE concentrations of the total solid and the total solid digestate compared to legal limits

PTE	Concentration in TS	Concentration in TS_DIG	Legal limit
Unit	[mg/kg TS]	[mg/kg TS]	[mg/kg TS]
As	10.3	13.2	40.0
Pb	3.9	5.0	150.0
Cd	0.85	1.1	1.5
Ni	68.0	87.0	80.0
Cr	11.9	15.2	–
Cu	16.1	20.6	–
Zn	154.5	197.8	–
TP	2032	2601	–

Reference: UFZ. Total P (TP), PTE concentrations in the total solid of E. nuttallii (concentration in TS), concentration in total solids of digestate of E. nuttallii (concentration in TS_DIG), and the legal limits of heavy metal concentrations in fertilizers were given according to the German fertilizer ordinance (Annex 2, Table 1.4 DüMV)

ISSN: 2192-0567