| dc.description.abstract | Biomass utilization has been drawn attention of governments and industries, as it is renewable
resource. Pulp and paper industry depend on woody biomass utilization system to get multiple
products. However, it is also featured by large energy consumption and low efficiency of using
raw material. It is crucial to integrate biorefinery concept into pulp mill to create a long-term
sustainable pathway. This research work trends to investigate the performance of autohydrolysis
of spruce wood at various parameters such as temperature, residence time, liquid to solid ratio.
The performance of self-aggregation of hydrolysates with different conditions and deposition of
hydrolysates on stainless steel surface were also studied. The hydrostats were characterized by gel
permeation chromatography (GPC), nuclear magnetic resonance (NMR) spectroscopy, zeta
potential analyzer, scanning electron microscopy (SEM), particle charge detector, quartz crystal
microbalance with dissipation (QCM-D), dynamic light scattering (DLS). It was noticed that the
hydrolysate with higher hydrophilicity and surface tension possessed higher affinity for adsorption
of its lignocelluloses on stainless steel. The image analysis and QCM results revealed that the
formation of agglomerates in hydrolysate and their deposition on stainless steel surface. The results
of this thesis provided insights into the fundamental knowledge on the autohydrolysis, selfassembly behavior of hydrolysates which have great influence for producing lignocellulose-based
coproducts.
In this thesis, the hydrolysates generated via autohydrolysis of spruce wood chips were directly
used as feedstock for producing coagulant. In-situ polymerization of acrylamide (AM) and
lignocellulose (LC) of hydrolysates in an aqueous solution in the presence of K2S2O8 as an initiator
was successfully conducted, and the reaction was optimized to generate LC-AM with the highest
molecular weight and charge density. In order to confirm the grafting of acrylamide on LC NMR
spectroscopy confirmed the grafting of acrylamide on LC. Other properties of product were
characterized by elemental analyzer, zeta potential analyzer, gel permeation chromatography
(GPC) and particle charge detector (PCD). The applications of the resultant copolymer as a
coagulant in dye suspensions were systematically assessed. LC-AM was combined with cationic
polyacrylamide and anionic polyacrylamide in dual-coagulant systems. These results confirmed
that the dual system of LC-AM and APAM led to a similar dye removal as the singular system of
APAM, which was due to the multibranch structure of LC-AM favoring bridging. In addition to
its reliable dye removal efficiency, other advantages of LC-AM were its biodegradable, environmentally friendly, and inexpensive production costs compared with other oil-based
coagulants used in industry. | en_US |
