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Changes in Selected Organic and Inorganic Compounds in the Hydrothermal Carbonization Process Liquid While in Storage
Nader Marzban1,2,3, Judy A Libra1, Vera Susanne Rotter2
1Leibniz Institute of Agricultural Engineering and Bio-economy e.V. (ATB), Max-Eyth-Allee 100, 14469 Potsdam, Germany.
ACS Omega
|February 6, 2023
Summary
Hydrothermal carbonization (HTC) liquid stability is crucial for its applications. Storage, even at freezing temperatures, significantly alters HTC liquid composition, impacting its usability.
Area of Science:
- Biomass conversion and utilization
- Environmental chemistry
- Sustainable materials
Background:
- Hydrothermal carbonization (HTC) converts biomass into hydrochar and process liquid.
- The stability and composition of HTC liquid over time are poorly understood.
- Changes in HTC liquid can limit its applications.
Purpose of the Study:
- To investigate the impact of storage temperature and time on HTC liquid stability.
- To analyze structural and compositional changes in organic and inorganic compounds.
- To assess the influence of these changes on potential applications.
Main Methods:
- Storage of HTC liquid from digested cow manure at 20°C, 4°C, and -18°C for 12 weeks.
- Analysis of organic and inorganic compound concentrations using ANOVA.
- Monitoring of structural and physicochemical changes over time.
Main Results:
- Storage time significantly affected most organic compound concentrations, except acetic acid.
- Substantial compositional changes occurred at all tested temperatures, including -18°C.
- Aromatic compounds polymerized, forming precipitates and influencing inorganic compound speciation.
Conclusions:
- HTC liquid is unstable during storage, with significant compositional shifts even under freezing conditions.
- Precipitate formation alters the liquid's chemical makeup, affecting its suitability for various applications.
- Understanding storage effects is vital for optimizing the use of HTC-derived liquids.
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