PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 3, Number 2, 2017
Modeling and simulation of the industrial sequencing batch reactor wastewater treatment process for cleaner production in pulp and paper mills, Yi Man et al , Journal of Cleaner Production , 167. Being an internationally accepted standard for the activated sludge modelling, the Activated Sludge Model No.1 (ASM1) was used to simulate the treatment of paper mills effluent in an industrial full-scale sequencing batch reactor (SBR). The results showed that the ASM1 could be reasonably used in the papermaking wastewater treatment simulation. WOOD PANEL Isolation of lignocellulose nanofibrils (LCNF) and application as adhesive replacement in wood composites: example of fiberboard, Cherif Ibrahima et al , Cellulose , 24 (7). Thermomechanical pulp (TMP) produced using atmospheric refining was ground to isolate lignocellulose nanofibrils (LCNF). Forty minutes and a specific energy of about 1300 kWh/t were necessary to reach the end-point of the process defined by the presence of 95% fines in the slurry. The effect of using LCNF as adhesive replacement in fibreboard has been assessed. A maximum modulus of rupture of 12.1 MPa comparable to that of commercial fibreboards and high modulus of elasticity, was obtained at 20% LCNF content for panels produced at 180 °C. The binding ability of LCNF and its effect on the mechanical properties of fibreboards were more perceptible when a less refined TMP with lower fine content and longer fibres was used in the process. Comparison between two different pretreatment technologies of rice straw fibers prior to fiberboard manufacturing: Twin-screw extrusion and digestion plus defibration, Dyna Theng et al , Industrial Crops and Products, 107. The present work compares two different pretreatment technologies, i.e. twin-screw extrusion, and steaming digestion plus defibration, for producing a thermo-mechanical pulp from rice straw for fibreboard manufacturing. The results showed that liquid/solid ratio had influence on energy consumption of the equipment for both defibrating methods For the twin-screw extrusion method, a lower liquid/solid ratio required more energy while for the digestion plus defibration the effect was the opposite. The corresponding total specific energy consumption ranged from 0.668 kW h/kg to 0.946 kW h/kg dry matter for twin-screw extrusion, and from 6.176 kW h/kg to 8.52 kW h/kg dry matter for digestion plus defibration. Thus, the pulping method consumed about nine times more energy than that of the twin-screw extrusion. In addition, for twin-screw extrusion, the liquid/solid ratio did not have a substantial effect on fibre characteristics with similar chemical compositions and thermal properties. Approaching a new generation of fiberboards taking advantage of self lignin as green adhesive, Juan Domínguez-Robles et al , International Journal of Biological Macromolecules , online. This study describes the use of lignin as natural adhesive for the production high density fibreboards (HDF) made from wheat straw. In the present work, this agricultural residue was used to produce thermomechanical pulp and the used lignin was obtained from the spent liquors generated in the same process. A hot pressing process was conducted to manufacture these fibreboards and different percentages of this green adhesive were targeted. Physical and mechanical properties were assessed and the results revealed that the panels made only with wheat straw fibres had a flexural strength value (52.79 MPa) even above the value corresponding to the commercial HDF (41.70 MPa). Also, results showed that the incorporation of soda-lignin lead to lignocellulosic composites that, as lignin content was increased (from 0 to 15%), mechanical properties were enhanced.
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Technical Abstracts
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