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J Environ Manage. 2016 May 15;173:72-8. doi: 10.1016/j.jenvman.2016.03.006. Epub 2016 Mar 11.

Hydrothermal carbonization of biomass from landscape management - Influence of process parameters on soil properties of hydrochars.

Author information

1
Institute of Biology and Environmental Science, Carl von Ossietzky University of Oldenburg, Ammerländer Heerstr. 114-118, 26129, Oldenburg, Germany. Electronic address: michael.roehrdanz@gmx.de.
2
Department of Engineering Sciences and Computer Science, University of Applied Sciences Osnabrück, Albrechtstr. 30, 49076, Osnabrück, Germany.
3
Institute of Technical Chemistry, Carl von Ossietzky University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26111 Oldenburg, Germany.
4
Institute of Biology and Environmental Science, Carl von Ossietzky University of Oldenburg, Ammerländer Heerstr. 114-118, 26129, Oldenburg, Germany.

Abstract

Besides pyrolysis the technology of hydrothermal carbonization (HTC) is tested to produce hydrochars for soil improvement. The chemical and physical properties of the hydrochars mainly depend on the feedstock and the process parameters reaction time and process temperature. Systematic investigations on the influences of these process parameters on soil properties of hydrochars like water holding capacity (WHC) and cation exchange capacity (CEC) are missing. In this study, a rush-rich biomass was carbonized within defined HTC process conditions under variation of reaction time and process temperature to produce hydrochars. Analysis of WHC, CEC, the elemental composition and Fourier-transform infrared spectroscopy (FT-IR) were performed to evaluate the influence of HTC process conditions on the pedological hydrochar properties. The results indicated that at increasing reaction severity (reaction time and process temperature) WHC and CEC decreased as well as the elemental O/C ratio. The decrease of WHC and CEC is based on the decrease of the hydrochar surface polarity. However, even the lowest WHC and CEC of investigated hydrochars still exceeded those of pure quartz sand by factors of 5-10. An application of hydrochars produced at severe HTC conditions could improve WHC and CEC of sandy soils. This has to be investigated in further studies.

KEYWORDS:

Biochar; Cation exchange capacity; Infrared spectroscopy; Soil improvement; Water holding capacity

PMID:
26974240
DOI:
10.1016/j.jenvman.2016.03.006
[Indexed for MEDLINE]

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