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Valorization of animal bone waste for agricultural use through biomass co-pyrolysis and bio-augmentation

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Abstract

Thermal treatment of animal bone waste (i.e., pyrolysis) is an alternative technology to sustainably manage slaughterhouse waste for agricultural uses. However, concentration of plant-available phosphorus (P) is limited in thermally treated animal bone (i.e., bone char). This study, therefore, aimed to develop sustainable methods to increase the P fertilizer value of animal bone waste through co-pyrolysis of animal bone with lignocellulose agricultural waste and bio-augmentation. Four types of bone chars were produced using two different pyrolysis temperatures (450°C and 850°C) and pyrolysis techniques (conventional and co-pyrolysis). These bone chars were then bio-augmented with four different phosphate solubilizing microorganisms (PSM). In vitro and incubation experiments were conducted to assess the fertilizing value of the products. The result showed that co-pyrolysis of animal bone with lignocellulose agricultural waste combined with bio-augmentation increased P solubility by 133–167%, at the lower production temperature. P solubility decreased considerably at a higher production temperature. However, it was increased by 16- to 21-fold when co-pyrolysis was coupled with bio-augmentation. Addition of co-pyrolyzed bone char enriched with PSM and organic carbon to soil increased P availability by 34 to 48% and PSM survival rate by 22 to 76%. The findings demonstrated that co-pyrolysis combined with bio-augmentation could be an efficient and low-cost strategy to improve the agricultural use of animal bone and to reduce the dependency on chemical fertilizer. This study has a significant importance particularly for developing countries, where the use of chemical fertilizer is limited due to its high price; and slaughterhouse waste has created an environmental concern.

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Abbreviations

CFU:

colony forming unit

CYA:

Czapek yeast extract agar

EC:

electrical conductivity

LC-OCD:

liquid chromatography organic carbon detection

NBRIP:

National Botanical Research Institute’s phosphate

OA:

organic acid

PSM:

phosphate solubilizing microorganisms

SEM:

scanning electron microscopy

WEOC:

water-extractable organic carbon

XRD:

powder X-ray diffraction

YEA:

yeast extract agar

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Acknowledgements

This work has been conducted as part of a PhD thesis project supported by Private University Research Branding Project (PLANE3T) funded by MEXT, Japan, and supported by Science and Technology Research Partnership for Sustainable Development (SATREPS; Grant Number JPMJSA2005) funded by Japan Science and Technology Agency (JST)/Japan International Cooperation Agency (JICA). Animal (sheep) bones were supplied from local restaurants in Tokyo, Japan.

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Milkiyas Ahmed, Shinjiro Sato, and Abebe Nigussie conceived the idea, designed the study, and conducted the statistical analyses. Shinjiro Sato, Solomon Addis, Berhanu Belay, and Johannes Lehmann supervised the development and progress of the work. Milkiyas Ahmed wrote the draft manuscript, and all the authors contributed equally to editing the manuscript. All the authors gave their final approval for publication and have no competing interests or conflict of interest.

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Correspondence to Shinjiro Sato.

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Ahmed, M., Nigussie, A., Addisu, S. et al. Valorization of animal bone waste for agricultural use through biomass co-pyrolysis and bio-augmentation. Biomass Conv. Bioref. 13, 12823–12832 (2023). https://doi.org/10.1007/s13399-021-02100-w

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