Conti, Federica

Rosendahl, Lasse

Toor, Saqib

English

Federica Conti*, Saqib S. Toor, Lasse RosendahlAalborg University, Department of Energy Technology, Aalborg, Denmark* fco@et.aau.dk1.  BACKGROUND3.  FEEDSTOCKS CHARACTERIZATION4.  EXPERIMENTAL RESULTS5.  CONCLUSIONSFate of nutrients and metalsTrace the presence of nutrients (N, P, K) and metals (Fe,Ni, Zn…) in HTL products and establish their distributionamong the phases (solids, water phase and biocrude).Potentials for nutrients recoveryAssess whether N, P, K can be recovered for being usedas fertilizers, so that to close the nutrients cycle.Distribution of inorganic elementsamong products from HTL of manureHTLADManure and digestate are waste products, but alsovaluable carbon sources suitable as wet feedstock forHydrothermal Liquefaction (HTL).Nutrients and metals, contained in manure and digestate,are transfered to the products after HTL; this might affectbiocrude quality.2.  OBJECTIVESThe use of manure or digestate in HTL has multiple advantages:  • Waste reduction through thermochemical conversion• Biocrude production upgradable to drop-in fuel• Recovery of nutrients, while they are lost when incineratingMoisture[wt.%]Ash[wt.%]C H N OSWINE 74.2 13.1 42.0 5.9 1.8 37.2COW 61.2 6.8 46.7 5.9 1.7 38.9DIGESTATE 70.8 10.7 44.5 5.7 1.5 37.6.19.211.614.234.833.221.1010203040Yields[wt.%]solidsbiocrude0510152025Ca Cd Cr Cu Fe K Mg Mn Na Ni P Pb S ZnConcentration[mg/g]0102030405060708090100Ca Cd Cr Cu Fe K Mg Mn Na Ni P Pb S ZnSWINE%020406080100Ca Cd Cr Cu Fe K Mg Mn Na Ni P Pb S Zn020406080100Ca Cd Cr Cu Fe K Mg Mn Na Ni P Pb S ZnMoisture: samples are dried in a moisture analyzer at 120C Ash (d.b.): samples are burnt in a furnace for 3h at 775CElemental composition (d.b.): C, H, N, % by CHN analyzerO % = 100 - C - H - N - ashSWINE COW DIGESTATEC H N O+ash C H N OSWINE 22.0 1.0 0.6 76.4 74.4 9.5 2.6 13.5COW 51.5 3.0 1.2 44.3 76.3 8.8 2.4 12.5DIGESTATE 44.3 2.7 1.3 51.7 75.9 8.7 2.6 12.9Yields (d.b.) in solids and biocrude after HTL (400C, 15min)Normalized distribution of inorganics among HTL productsbiocrudesolidswater phase40.0 daf35.6 daf23.6 dafCOW DIGESTATEswinedigestatecowElemental composition of solids and biocrudes• Most inorganics, including Phosphorus (P), are almostexclusively recovered in the solids (>80%). Thisfacilitates their extraction and re-use as fertlizers.• Potassium (K) and Sodium (Na) are instead primarlyconcentrated in the water phase (>70%).• Nearly half of the Sulfur (S) is found in the biocrude; alsoNitrogen (N) tends to concentrate in the oil. An increasedamount of S and N in the oil negatively affects its quality.6.  ACKNOWLEDGEMENTSGrant no. 1305-00030B

Distribution of inorganic elements among products from HTL of manure

https://vbn.aau.dk/files/336217841/Poster_FEDERICA_CONTI.pdf

Distribution of inorganic elements among products from HTL of manure

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