Journal article Open Access

Assessment of the effects of process water recirculation on the surface chemistry and morphology of hydrochar

Pablo J. Arauzo; Maciej P. Olszewski; Xia Wang; Jens Pfersich; Victor Sebastian; Joan Manyà; Niklas Hedin; Andrea Kruse


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    <subfield code="a">&lt;p&gt;The effect of two process water (PW) recirculation strategies after the hydrothermal carbonization (HTC) of brewers spent grains (BSG) is evaluated with the focus on the hydrochar characteristics. The HTC process has been carried out under different operating conditions; residence time between 2 - 4 h and temperature in the range of 200 - 220 &amp;deg;C. The hydrochars composition reveals that operating conditions have a more significant effect than PW recirculation on the hydrochar composition. The composition of the liquid produced at HTC plus PW recirculation process is essentially controlled by the operating temperature, for instance, the total organic carbon (TOC) in the PW changes in the narrow range of 200 - 220 &amp;deg;C. A detailed analysis of PW has also been done. The main components of the liquid phase are lactic, formic, acetic, levulinic, and propionic acid and 5-hydroxymethylfurfural, that affect the surface structure of the hydrochars.&lt;/p&gt;</subfield>
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    <subfield code="u">University of Hohenheim</subfield>
    <subfield code="a">Maciej P. Olszewski</subfield>
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    <subfield code="u">University of Hohenheim</subfield>
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    <subfield code="u">University of Zaragoza</subfield>
    <subfield code="a">Victor Sebastian</subfield>
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    <subfield code="u">University of Zaragoza</subfield>
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    <subfield code="u">University of Stockholm</subfield>
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    <subfield code="u">University of Hohenheim</subfield>
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