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An assessment of hydrothermal treatment of dairy waste as a tool for a sustainable phosphorus supply chain in comparison with commercial phosphatic fertilizers

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Abstract

Hydrothermal treatment has been proven efficient in immobilizing phosphorus and other macronutrients from animal waste; however, there are still gaps in understanding the best end-use applications for nutrient-dense biochars. In this research, aqueous phase phosphorus availability (P aq) of biochars produced at various temperatures and residence times was determined in pH 5.5 citric acid for 8 weeks. Further, P aq of commercially available composted manure and fertilizers was also determined for comparison. P aq was found to plateau after 4 weeks in aqueous phase. Hydrothermal treatment temperature and residence time were found to improve nutrient immobilization efficiency, while conversely lowering P aq. Comparing to commercially available fertilizers, biochars produced from hydrothermal treatment are low in P aq, despite high P2O5% found in the solids. A preliminary process study evaluating energy consumption and CO2 emissions associated with recycled P2O5 recovered from the process operating at 200 °C was conducted, indicating CO2 emissions with respect to soluble phosphorus are significantly higher in comparison with commercial phosphatic fertilizers. Further recommendations regarding life cycle analysis of the phosphorus supply chain are also discussed.

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Abbreviations

BC:

Biochar

CF:

Commercial fertilizer

DAP:

Diammonium phosphate

EC:

Product energy consumption

EPA:

US Environmental Protection Agency

ES:

Exported steam product energy consumption

FM:

Fresh manure

FO:

Fuel oil product energy consumption

IC:

Ion chromatography

ICP-OES:

Inductively coupled plasma optical emission spectrometry

IS:

Imported steam product energy consumption

MAP:

Monoammonium phosphate

NG:

Natural gas product energy consumption

Nimm :

Nutrient immobilization

P aq :

Phosphorus availability

PFD:

Process flow diagram

PO4 3−%:

Phosphate percentage

TSP:

Triple superphosphate

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Acknowledgement

This research is supported by an R&D grant through the Ohio Water Development Authority. The authors would like to thank Ohio State University Krauss Dairy’s facility for providing dairy cattle manures for this study. In addition, Ms. Nikita Khozin is recognized for her efforts in conducting experimental tests to support the publication. Finally, the authors thank Dr. M. Toufiq Reza and Dr. Dora E. López for their input regarding experimental procedures and process modeling.

Funding

The authors would like to thank Ohio Water Development Authority for the financial support of this research.

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Correspondence to Jason Trembly.

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Fan, W., Bryant, L., Srisupan, M. et al. An assessment of hydrothermal treatment of dairy waste as a tool for a sustainable phosphorus supply chain in comparison with commercial phosphatic fertilizers. Clean Techn Environ Policy 20, 1467–1478 (2018). https://doi.org/10.1007/s10098-017-1440-z

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  • DOI: https://doi.org/10.1007/s10098-017-1440-z

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