ASSESSMENT OF HEAVY METALS IN HYDROCHAR PRODUCED BY HYDROTHERMAL CARBONIZATION OF DAIRY MANURE

B. Brian HE, Zheting BI, Lide CHEN

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Front. Agr. Sci. Eng. ›› 2023, Vol. 10 ›› Issue (3) : 437-447. DOI: 10.15302/J-FASE-2023507
RESEARCH ARTICLE

ASSESSMENT OF HEAVY METALS IN HYDROCHAR PRODUCED BY HYDROTHERMAL CARBONIZATION OF DAIRY MANURE

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Highlights

● Content of heavy metals in hydrochar varies considerably, from 50% to 100%.

● Concentrations of heavy metals in hydrochar can be higher than those in the dairy manure.

● Concentrations of heavy metals in hydrochar are far below the regulatory level.

Abstract

Hydrochar produced from dairy manure is a regulated biosolid if being promoted for agricultural applications thus must have the properties that comply with all environmental standards and government regulations, including the levels of heavy metals (HMs). In this study, systematic research was conducted on HM levels in hydrochar from dairy manure and on the effects of processing conditions, including processing temperature (180–255 °C), holding time (30120 min) and solid content of manure slurry (2%15%), through a central composite design and statistical analyses. It was found that HMs can be retained in hydrochar, ranging from 40% to 100%. The processing temperature and solid content in the feed were the most influential process parameters that affected HMs retention in hydrochar. Statistical analysis showed that there was no single optimal point to minimize HMs retained in hydrochar, but there were minimization points at given processing time and solid content. Most HMs concentrations were higher in hydrochar than those initially in dairy manure but were greatly below the thresholds as set by the US government regulations. Thus, hydrochar is feasible for use as a phosphorus-enriched organic fertilizer and/or soil amendment for agricultural applications without serious concerns about HMs it might contain.

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Keywords

heavy metals / dairy manure / hydrochar / hydrothermal carbonization / waste management

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B. Brian HE, Zheting BI, Lide CHEN. ASSESSMENT OF HEAVY METALS IN HYDROCHAR PRODUCED BY HYDROTHERMAL CARBONIZATION OF DAIRY MANURE. Front. Agr. Sci. Eng., 2023, 10(3): 437‒447 https://doi.org/10.15302/J-FASE-2023507

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Acknowledgements

This work was in part financially supported by the hatch projects of USDA National Institute of Food and Agriculture (1012741 and 1019082) and Idaho Agricultural Experiment Station (IDA01575 and IDA01604), and by a grant from the USDA AFRI Sustainable Agricultural Systems Program (2020-69012-31871). Sincere thanks are extended to Chad Dunkel (Department of Chemical and Biological Engineering, University of Idaho) and Kevin Kruger (Twin Falls Research and Extension Center, University of Idaho) for their assistance in sample collection and laboratory preparation in this study.

Compliance with ethics guidelines

B. Brian He, Zheting Bi, and Lide Chen declare that they have no conflicts of interest or financial conflicts to disclose. This article does not contain any studies with human or animal subjects performed by any of the authors.

RIGHTS & PERMISSIONS

The Author(s) 2023. Published by Higher Education Press. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0)
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