Recovery and composition of biochar after feeding to cattle

Abstract

To address the urgent need to mitigate agricultural greenhouse gas emissions, research is investigating innovative strategies, including the application of biochar in various agricultural practices. Feeding biochar to cattle is an interesting strategy that not only aims to improve animal health and productivity, but can also have a cascading effect on soil improvement and CO₂ sequestration. Analysing the recovery efficiency of digested biochar and its structural integrity can provide insight into the potential of post-digestion biochar application. Here biochar quantification in dung is investigated for the first time using three different methodologies, namely thermal analysis, elemental analysis, and dichromate oxidation. Results indicate that a relative quantification within ± 1% biochar is possible. The majority of biochar (70–90%) fed to dairy cows survived digestion. The analysis further reveals selective preservation of the most stable condensed aromatic fractions of biochar during digestion, similar to short-term ageing in soil. The remaining digested biochar has an H/C ratio of 0.22 and an O/C ratio of 0.05, meeting the criteria for highly stable biochar. Our findings suggest that the digested biochar is highly suitable for long-term carbon sequestration when applied to soil via manure, offering a promising strategy for compensating agricultural greenhouse gas emissions.

Keywords

Biochar / Cow / Digestion / CO₂ sequestration / Agriculture

References

[1] Bird M. Lehmann J, Joseph S. Test procedures for biochar analysis in soils. Biochar for environmental management, 20152New York, Routledge

[2] Bird MI, Gröcke DR. Determination of the abundance and carbon isotope composition of elemental carbon in sediments. Geochim Cosmochim Acta, 1997, 61(16): 3413-3423

[3] Budai A, Zimmerman AR, Cowie AL, Webber JBW, Singh BP, Glaser B, et al.. Biochar Carbon Stability Test Method: an assessment of methods to determine biochar carbon stability. Int Biochar Initiat, 2013, 1: 1-20

[4] Calvelo Pereira R, Kaal J, Camps Arbestain M, Pardo Lorenzo R, Aitkenhead W, Hedley M, et al.. Contribution to characterisation of biochar to estimate the labile fraction of carbon. Org Geochem, 2011, 42(11): 1331-1342

[5] Dittmann MT, Baki C, Terranova M, Amelchanka SL, Dubois S, Wiget A, et al.. The effect biochar supplementation on feed utilization, milk production and methane emission in lactating dairy cows. Anim Feed Sci Technol, 2024, 318 116127

[6] EBC (2022) European Biochar Certificate—guidelines for a sustainable production of biochar. (Csi) CSI, editor. Version 10.3 ed. Frick, Switzerland.

[7] Hagemann N, Joseph S, Schmidt HP, Kammann CI, Harter J, Borch T, et al.. Organic coating on biochar explains its nutrient retention and stimulation of soil fertility. Nat Commun, 2017, 8(1): 1089

[8] Hammes K, Schmidt MWI. Lehmann J, Joseph S. Changes of biochar in soil. Biochar for environmental management, 20091Routledge169-181

[9] Hardy B, Leifeld J, Knicker H, Dufey JE, Deforce K, Cornélis J-T. Long term change in chemical properties of preindustrial charcoal particles aged in forest and agricultural temperate soil. Org Geochem, 2017, 107: 33-45

[10] Hardy B, Borchard N, Leifeld J. Identification of thermal signature and quantification of charcoal in soil using differential scanning calorimetry and benzene polycarboxylic acid (BPCA) markers. Soil, 2022, 8(2): 451-466

[11] Harvey OR, Kuo LJ, Zimmerman AR, Louchouarn P, Amonette JE, Herbert BE. An index-based approach to assessing recalcitrance and soil carbon sequestration potential of engineered black carbons (biochars). Environ Sci Technol, 2012, 46(3): 1415-1421

[12] Igalavithana AD, Mandal S, Niazi NK, Vithanage M, Parikh SJ, Mukome FND, et al.. Advances and future directions of biochar characterization methods and applications. Crit Rev Environ Sci Technol, 2018, 47(23): 2275-2330

[13] Joseph SD, Camps-Arbestain M, Lin Y, Munroe P, Chia CH, Hook J, et al.. An investigation into the reactions of biochar in soil. Soil Res, 2010, 48(7): 501-515

[14] Joseph S, Pow D, Dawson K, Mitchell DRG, Rawal A, Hook J, et al.. Feeding biochar to cows: an innovative solution for improving soil fertility and farm productivity. Pedosphere, 2015, 25(5): 666-679

[15] Kammann C, Ippolito J, Hagemann N, Borchard N, Cayuela ML, Estavillo JM, et al.. Biochar as a tool to reduce the agricultural greenhouse-gas burden—knowns, unknowns and future research needs. J Environ Eng Landsc Manag, 2017, 25(2): 114-139

[16] Lebron I, Cooper DM, Brentegani MA, Bentley LA, Dos Santos Pereira G, Keenan P, et al.. Soil carbon determination for long-term monitoring revisited using thermo-gravimetric analysis. Vadose Zone J, 2023

[17] Leifeld J. Thermal stability of black carbon characterised by oxidative differential scanning calorimetry. Org Geochem, 2007, 38(1): 112-127

[18] Liu S, Peng S, Zhang B, Xue B, Yang Z, Wang S, Xu G. Effects of biochar pyrolysis temperature on thermal properties of polyethylene glycol/biochar composites as shape-stable biocomposite phase change materials. RSC Adv, 2022, 12(16): 9587-9598

[19] Ma M, Bai Y, Wang J, Song X, Su W, Wang F, et al.. Thermal conversion behavior and nitrogen-containing gas products evolution during co-pyrolysis of cow manure and coal: a thermal gravimetric analyzer/differential scanning calorimetry–mass spectrometer investigation. Asia-Pac J Chem Eng, 2021

[20] Münger A, Schori F, Schlegel P (2021) Fütterungsempfehlungen für die Milchkuh. In: Grünes Buch, Kapitel 7, pp 1-2

[21] Murtaza G, Usman M, Ahmed Z, Shabbir RN, Ullah Z. Molecular understanding of biochar aging on their properties.pdf. EQA Int J Environ Qual, 2021, 43: 30-46

[22] Ogawa M, Okimori Y, Takahashi F. Carbon sequestration by carbonization of biomass and forestation: three case studies. Mitig Adapt Strat Glob Change, 2006, 11(2): 429-444

[23] Plante AF, Fernández JM, Leifeld J. Application of thermal analysis techniques in soil science. Geoderma, 2009, 153: 1-10

[24] Preston C, Schmidt M. Black (pyrogenic) carbon: a synthesis of current knowledge and uncertainties with special consideration of boreal regions2006Biogeosciences

[25] Rodrigues L, Budai A, Elsgaard L, Hardy B, Keel SG, Mondini C, et al.. The importance of biochar quality and pyrolysis yield for soil carbon sequestration in practice. Eur J Soil Sci, 2023

[26] Romero CM, Redman APH, Terry SA, Hazendonk P, Hao X, McAllister TA, et al.. Molecular speciation and aromaticity of biochar-manure: insights from elemental, stable isotope and solid-state DPMAS (13)C NMR analyses. J Environ Manage, 2021, 280 111705

[27] Schmidt MWI, Noack A. Black carbon in soils and sediments: analysis, distribution, implications, and current challenges. Global Biogeochem Cycles, 2000, 14: 777-793

[28] Schmidt HP, Hagemann N, Draper K, Kammann C. The use of biochar in animal feeding. PeerJ, 2019, 7 e7373

[29] Schmidt HP, Kammann C, Hagemann N, Leifeld J, Bucheli TD, Sánchez Monedero MA, et al.. Biochar in agriculture—a systematic review of 26 global meta-analyses. GCB Bioenergy, 2021, 13(11): 1708-1730

[30] Scott AC. Charcoal recognition, taphonomy and uses in palaeoenvironmental analysis. Palaeogeogr Palaeoclimatol Palaeoecol, 2010, 291(1): 11-39

[31] Tsechansky L, Graber ER. Methodological limitations to determining acidic groups at biochar surfaces via the Boehm titration. Carbon, 2014, 66: 730-733

[32] Zimmerman A, Gao B (2013) The stability of biochar in the environment. In: Ladygina N, Rineau F (eds) Biochar and soil biota, 1 edn. pp 1–40.

Funding

Bundesamt für Landwirtschaft(62700229)

RIGHTS & PERMISSIONS

The Author(s)