Wet Oxidation Pretreatment of Wood Pulp Waste for Enhancing Enzymatic Saccharification

Abstract

Effective pretreatment of wood pulp waste is important for enhancing enzymatic saccharification. For this reason, wet oxidation process conditions were considered with the hypothesis that the alkaline oxygen conditions would favor delignification and hydrolysis of lignocellulose. Enzymatic saccharification was greatly improved to 42.9% in terms of reducing sugar yield under the conditions of pH = 10, oxygen pressure = 1.2 MPa, time = 15 min, and temperature = 195 °C. A total of 39% of lignin and 73% of hemicellulose were removed and dissolved into the hydrolyzate. Furthermore, the chemical structure, crystallinity, and morphology of the treated substrate were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM).

Facile ultrasonic preparation of a polypyrrole membrane as an absorbent for efficient oil-water separation and as an antimicrobial agent

“…2 a and b). The blank fabric shows three major sharp peaks at 1710 cm −1 , which were assigned to C = O stretching (non-conjugated carbonyl) [38] . The peaks at 1240 and 1088 cm −1 were accredited to C-O stretching.…”

“…The other peaks at 1706 and 1645 cm −1 were attributed C = O for non-conjugated carbonyl and conjugated carbonyl stretching vibration. [38] . Fig.…”

Pretreatment and composting technology of agricultural organic waste for sustainable agricultural development

“… [ 114 ] Wet oxidation method 120 °C + water and oxygen Promotes hemicellulose solubilization and increases enzyme accessibility to cellulose. [ 118 ] Mechanical + biological treatment AOW mechanical shredding + microbial composting treatment Increase the accessibility of hydrolytic enzymes to AOW and promote degradation. [ 127 ] Chemical + biological treatment Acid, alkali and oxidation pretreatment materials + microbial composting Reduces lignocellulose recalcitrance and promotes degradation of AOW.…”

“…Also to avoid inhibitor generation, the pretreatment pH was controlled between 4 and 7 [ 117 ]. Jietal et al increased the sugar recovery from 5.12% to 42.9% after the pretreatment of wood pulp waste by WO [ 118 ]. The most significant advantage of the wet oxidation reaction is that multiple responses can be performed in one step, which is beneficial for later scale-up production [ 119 ].…”