Sawdust

About: Sawdust is a research topic. Over the lifetime, 5526 publications have been published within this topic receiving 86499 citations. The topic is also known as: wood dust & hard wood dust.

Catalytic Hydrothermal Liquefaction of Waste Furniture Sawdust to Bio-oil

Abstract: The objective of present study is to investigate the effect of alkalis (NaOH, Na2CO3, KOH and K2CO3) on hydrothermal liquefaction of waste furniture sawdust (mixture of different types of waste woods) under sub-critical water conditions in a batch reactor operating at 280°C for 15 min. The liquefaction products were analysed using Fourier transform infrared spectroscopy, elemental composition, higher heating value and gas chromatography-mass spectrometry (GC-MS). The highest total bio-oil yield (34.9 wt%) and lowest solid residue yield (6.8 wt%) was obtained in the presence of 1.0 M K2CO3. Reactivity order for alkalis based on biomass conversion and liquid yield was found to be K2CO3 > KOH > Na2CO3 > NaOH. The experimental results showed that the bio-oils produced were enriched in carbon and hydrogen and had reduced level of oxygen compared with original sawdust. The GC-MS analysis showed that light bio-oils and heavy bio-oils comprised a complex mixture of organic compounds, which mainly include ...

Metal ion sorption to birch and spruce wood

Abstract: Sorption of metal ions from aqueous solutions to birch wood and spruce heartwood and sapwood has been studied. Functional groups in wood were determined by acid-base titrations. The sorption of metal ions to wood of the different tree species was investigated by a column chromatographic technique. The mechanism of sorption is mainly ion exchange by complexation of metal ions to the functional groups, e.g. carboxyl groups and phenolic hydroxyl groups, in the wood phase. By combination of the sorption experiments with four different metal ion mixtures, the following affinity order was established for spruce sapwood particles: Fe3+>>Pb2+>>Cu2+>>Fe2+>Cd2+>Zn2+>Ni2+>Mn2+≥Ca2+≥Sr2+≥ Ba2+>>Mg2+>>K+>Na+≈Li+. For all three types of stemwood studied, the affinity orders were almost the same. The ion exchange properties of wood were comparable to those of a weakly acid cation exchanger. The affinity order obtained for the synthetic resin was quite similar to the order given above for wood. The metal sorption properties of wood materials imply that they could be a potential material for removal of metal ions from aqueous solutions.

Flash pyrolysis of wood in a cyclone reactor

Abstract: This paper reports the first results of an experimental study of the continuous flash pyrolysis of wood sawdust in a cyclone reactor between 893 and 1330 K. The reaction produces low fractions of char (4%) and the gasification yield increases from 0% at about 800 K to 90% at around 1330 K with a constant volume fraction of CO and H2 (≈73%) and an increasing fraction of light hydrocarbons (up to 50% mass fraction). The heating value of the gas reaches 19 000 kJ m−3 STP for the highest temperatures. The wood particles mainly heated by radiation and solid convection react in less than 1 s while the carrier gas (residence time of the order of 0.05 s) seems to be only weakly heated. The 46.2 × 10−6 m3 cyclone reactor can operate with excellent stability for wood flow rates up to 0.35 kg h−1 at a wall temperature of 1330 K. The cyclone seems to be very efficient for carrying out reactions of the solid → fluids type but more accurate determination of process parameters such as gas and solid residence times and heat transfer efficiencies are required to gain a better understanding of the behaviour of such a high temperature reactor.

Effects of humic substances from composted or chemically decomposed poplar sawdust on mineral nutrition of ryegrass

Abstract: Two organic fertilizers were prepared from the same initial mixture of poplar sawdust, blood and flour either by composting in a reactor or by chemical oxidation. Both processes resulted in loss of c. 30% of the organic matter. Composting required 90 days in comparison to only a few hours with chemical oxidation. Extraction of the organic residues with 1 N KOH gave solutions containing 24·6 and 15·1 g/l of humic substances respectively. These humic solutions were applied to pot-grown Lolium multiflorum Lam. at 4 and 10 mg carbon per pot to assess the short-term uptake of macro and microelements by the plants. When the plants were short of phosphorus, the humic substances from the chemically decomposed sawdust supplied at 10 mg C per pot improved total P uptake and yield. Humic substances also increased copper and manganese uptake, and by enhancing root development, also improved nitrogen uptake and biomass yield.