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

RENEWABLE ENERGY

卷:155

Article

Arauzo, P. J.¹  Olszewski, M. P.¹  Wang, X.²  Pfersich, J.¹  Sebastian, V³  Manya, J.⁴  Hedin, N.²  Kruse, A.¹ 

[1] Univ Hohenheim, Inst Agr Engn, Dept Convers Technol Biobased Resources, Garbenstr 9, DE-70599 Stuttgart, DE, Germany

[2] Stockholm Univ, Dept Mat & Environm Chem, SE-10691 Stockholm, Sweden

[3] Univ Zaragoza, Aragon Inst Nanosci INA, Dept Chem Engn, Campus Rio Ebro Edificio ID,C Poeta Mariano, Zaragoza 50018, Spain

[4] Univ Zaragoza, Aragon Inst Engn Res I3A, Crta Cuarte S-N, E-22071 Huesca, Spain

关键词: Hydrothermal carbonization;    Biochar;    Aqueous phase;    Recirculation;    Brewer's spent grains;   

DOI  :  10.1016/j.renene.2020.04.050

来源: Elsevier

【 摘 要 】

The effect of two process water (PW) recirculation strategies after 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, which are residence time between 2 and 4 h and temperature in the range of 200-220 degrees C. The composition of the hydrochars reveals that operating conditions have a more significant effect than PW recirculation. The composition of the liquid produced by HTC with PW recirculation 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 degrees C. A detailed analysis of PW also has been done. The main components of the liquid phase are lactic, formic, acetic, levulinic, and propionic acid as well as 5-hydroxymethylfurfural, that affect the surface structure of the hydrochars. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

Free