Effect of Liquid Hot Water Pretreatment on Hydrolysates Composition and Methane Yield of Rice Processing Residue

Lisbet Mailin López González and Monika Heiermann
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Lisbet Mailin López González: Centro de Estudios de Energía y Procesos Industriales (CEEPI), Universidad de Sancti Spíritus “José Martí Pérez” (UNISS), Avenida de los Mártires 360, Sancti Spíritus CP 60100, Cuba
Monika Heiermann: Leibniz Institute for Agricultural Engineering and Bioeconomy, Department Technology Assessment and Substance Cycles, Max-Eyth-Allee 100, 14469 Potsdam, Germany

Energies, 2021, vol. 14, issue 11, 1-14

Abstract: Lignocellulosic rice processing residue was pretreated in liquid hot water (LHW) at three different temperatures (140, 160, and 180 °C) and two pretreatment times (10 and 20 min) in order to assess its effects on hydrolysates composition, matrix structural changes and methane yield. The concentrations of acetic acid, 5-hydroxymethylfurfural and furfural increased with pretreatment severity (log Ro). The maximum methane yield (276 L kg −1 VS) was achieved under pretreatment conditions of 180 °C for 20 min, with a 63% increase compared to untreated biomass. Structural changes resulted in a slight removal of silica on the upper portion of rice husks, visible predominantly at maximum severity. However, the outer epidermis was kept well organized. The results indicate, at severities 2.48 ≤ log Ro ≤ 3.66, a significant potential for the use of LHW to improve methane production from rice processing residue.

Keywords: anaerobic digestion; liquid hot water pretreatment; hydrothermal pretreatment; lignocellulose; silica (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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