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F. Adani, January 24-25 What digestate is. F. Adani, A. Schievano, G. DImporzano, F. Tambone, B. Scaglia Di.Pro.Ve. Università degli Studi di Milano, Via.

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Presentation on theme: "F. Adani, January 24-25 What digestate is. F. Adani, A. Schievano, G. DImporzano, F. Tambone, B. Scaglia Di.Pro.Ve. Università degli Studi di Milano, Via."— Presentation transcript:

1 F. Adani, January 24-25 What digestate is. F. Adani, A. Schievano, G. DImporzano, F. Tambone, B. Scaglia Di.Pro.Ve. Università degli Studi di Milano, Via Celoria 2, 20133 Milano fabrizio.adani@unimi.it website: http://www.diprove.unimi.it/ http://www.diprove.unimi.it/

2 F. Adani, January 24-25 Digestate is not Ingestate Biological process determines chemical and biological modification of raw materials (ingestates) Therefore………… Anaerobic digestion is a biotechnology

3 F. Adani, January 24-25 Looking for the Identikit!!!! So… what is digestate ? ? ?

4 F. Adani, January 24-25 Degradation The AD process affects: Nutrients Organic matter quality Xenobiotics Organic load

5 F. Adani, January 24-25 Degradation : TS and VS mass balances; Organic load: BOD5 and COD. OM quality : biological stability, wet chemical and spectroscopic analyses. Nutrients : mass balance and speciation. Xenobiotic content : direct detection. Our approach

6 F. Adani, January 24-25 OM reduction of 60-70% Degradation Mass balance

7 F. Adani, January 24-25 Abbattimento COD e BOD Organic load COD BOD

8 F. Adani, January 24-25 OM quality Biological stability OM degradability Biological stability OM degradability Degradation processes determine a concentration of recalcitrant molecules. Biological tests - Anaerobic test; - Aerobic test.

9 F. Adani, January 24-25 Anaerobic test: potential biogas production It is a good test but it requires time ( 60 dd).

10 F. Adani, January 24-25 Anaerobic test (ABP)

11 F. Adani, January 24-25 Aerobic test: liquid state respiration index (SOUR) …..it allows a strong time reduction (20h) Cumulated O 2 up-take in 20h

12 F. Adani, January 24-25 Aerobic test

13 F. Adani, January 24-25 ingestati digestati A case study……….

14 F. Adani, January 24-25 Correlation ABP vs SOUR

15 F. Adani, January 24-25 Wet analyses Wet analyses Spectroscopic analyses Spectroscopic analyses OM quality

16 F. Adani, January 24-25 CS (% TS ) cell soluble 70-90%40-70% OM quality Macromolecular composition

17 F. Adani, January 24-25 ADL (% TS ) (Lignin, cutin, suberan, sterol) effetto concentrazione 2-8%10-35% OM quality Macromolecular composition

18 F. Adani, January 24-25 OM quality CPMAS 13C NMR Spectroscopy Ingestate Digestate

19 F. Adani, January 24-25 Pig slurry Digested Pig slurry

20 F. Adani, January 24-25 OM quality PCA analysis

21 F. Adani, January 24-25 OM quality PCA analysis Ingenstate Biological stability +-

22 F. Adani, January 24-25 Total N ( % TS) Nutrients: quantity 2-5%5-12%

23 F. Adani, January 24-25 N-NH 4 (% TS) 0-2%2-8% Nutrients: quality

24 F. Adani, January 24-25 Organic N Costante 2-4% Recalcitrant??? Nutrients: quality

25 F. Adani, January 24-25 Xenobiotic Heavy metals 0.5100.08Cr VI (mg/kg s.s.) -100.05As (mg/kg s.s.) -7501.16Cr III (mg/kg s.s.) 500250074.83Zn (mg/kg s.s.) 230100049.58Cu (mg/kg s.s.) 14075018.16Pb (mg/kg s.s.) 10030012.48Ni (mg/kg s.s.) 1.5101.19Hg (mg/kg s.s.) 1.5200.21Cd (mg/kg s.s.) Compost limitsBio solid limit ValueElemento Example of digestate analysis: Metal

26 F. Adani, January 24-25 absent Hygienic parameters ParameterDigestateLegge 99/92Reg. CE 1774/02 Fecal coliform (MPN/g TS)10010.000n.i. Vital Helminthes eggsAbsent n.i. SalmonellaAbsent< 100Absent Escherichia coliAbsentn.i.< 1000 n.i. = not indicated

27 F. Adani, January 24-25 Digestate: the Identikit OM Low organic load Medium biological stability Presence of humus-precursor molecules Nutrient content High N content; High agronomic value. Xenobiotic content Very Low

28 F. Adani, January 24-25 Amendment properties Fertilizer properties Hygienic product High quality Digestate: the Identikit

29 F. Adani, January 24-25 Digestate needs to be qualified……….

30 F. Adani, January 24-25 ….… a proposal Limits needed for: Biological stability Biological stability Hygienic parameters Hygienic parameters Heavy metal contents Heavy metal contents 1. Environmental and human protection:

31 F. Adani, January 24-25..…. a proposal Parameters should be indicated: N-tot and N-NH 4 ; N-tot and N-NH 4 ; P; P; K; K; OM. OM. Moisture content Moisture content 2. Agronomic use:

32 F. Adani, January 24-25 Thank you Dipartimento di Produzione Vegetale Università degli Studi di Milano


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