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1
Shirinkina, E. S., Ya I. Vaisman, and O. N. Kurilo. "Use of the Energy Potential of Organic Waste during its Incineration at Recycling Facility." Ecology and Industry of Russia 22, no. 7 (July 17, 2018): 54–58. http://dx.doi.org/10.18412/1816-0395-2018-7-54-58.
Повний текст джерелаАнотація:
To develop recommendations for improving the efficiency of the use of resource potential of organic waste, studies were carried out on the process of their thermal treatment using the example of plant manufactured by company Wellons type 2D6C8.AO. The plant is operated at one of the enterprises of the pulp and paper industry and is designed to generate process steam both by burning primary gas fuel and by using as a fuel mixture different types of organic waste (bark and wood waste, wood chips and sewage sludge). Based on the results obtained, the criteria for estimate the quality of fuel mixture: ash content (not more than 5 %), humidity (not more than 58 %), calorific value (not less than 4000 J/g), homogeneity of the component and fractional composition of the fuel mix (grain size not more than 25–50 mm) were worked out. Taking into account the developed criteria, the optimum composition of fuel mixture was determined (bark and wood waste 70–80 %, pulp and paper sludge 20–30 %, wood chips 4 %). As the main measures to reduce and stabilize the humidity of the fuel used for combustion, the introduction of dry debarking of wood, preliminary mechanical dewatering of the pulp and paper sludge, additional dosing in the main waste stream of waste formed in auxiliary industries (wooden pallets, boxes, paper scrap, etc.) is recommended. The introduction of the developed measures will prevent the disposal of waste in the environment and minimize the impact of the landfills on the geosystems.
2
Kyllönen, H., J. Lehto, P. Pirkonen, A. Grönroos, H. Pakkanen, and R. Alén. "Correlation of wood-based components and dewatering properties of waste activated sludge from pulp and paper industry." Water Science and Technology 62, no. 2 (July 1, 2010): 387–93. http://dx.doi.org/10.2166/wst.2010.273.
Повний текст джерелаАнотація:
Large amounts of wet sludge are produced annually in municipal and industrial wastewater treatment. Already in pulp and paper industry, more than ten million tons of primary sludge, waste activated sludge, and de-inking sludge is generated. Waste activated sludge contains large quantities of bound water, which is difficult to dewater. Low water content would be a matter of high calorific value in incineration but it also has effects on the volume and the quality of the matter to be handled in sludge disposal. In this research waste activated sludges from different pulp and paper mills were chemically characterised and dewatered. Correlations of chemical composition and dewatering properties were determined using multivariate analysis. Chemical characterisation included basic sludge analysis, elementary analysis and analysis of wood-based components, such as hemicelluloses and lignin-derived material. Dewatering properties were determined using measurements of dry solids content, flux and flocculant dosage. The effects of different variables varied according to the response concerned. The variables which were significant regarding cake DS increase in filtration or centrifugation and flocculant dosage needed in filtration were different from those which were significant regarding flux.
3
Zhou, Hongde, Daniel W. Smith, and David C. Sego. "Characterization and use of pulp mill fly ash and lime by-products as road construction amendments." Canadian Journal of Civil Engineering 27, no. 3 (June 1, 2000): 581–93. http://dx.doi.org/10.1139/l99-081.
Повний текст джерелаАнотація:
Fly ash and lime by-products are the two main waste streams generated by the pulp and paper industry. Traditionally, these wastes are disposed of either in surface impoundment or landfills. Greater environmental concerns and limited land availability have made these disposal practices increasingly unacceptable and costly. Thus, the objective of this study was to determine the feasibility of beneficial utilization alternatives with emphasis on their use as road construction amendment materials based on technical, economical, and environmental considerations. The experiments were conducted to comprehensively characterize the chemical, physical, engineering, and environmental properties for both waste samples and their mixtures prepared with local soils at different curing conditions. Field road tests were then conducted to verify and assess the performance of the mixtures in terms of load bearing capacity, serviceability, and compaction. The results showed that pulp mill wastes would have little adverse environmental impact and could be used as road construction amendments to improve soil strength and reduce deformation. This improvement was significantly affected by soil types, moisture contents, and waste addition rates. During waste-soil amendment, the metal leachability would be further reduced by the occurrence of solidification processes.Key words: wood ash, fly ash, lime by-products, solid waste management, pulp mill waste, waste utilization, leaching tests.
4
Raman, N. S., Mamta Makode, and Sukumar Devotta. "Environmental auditing in India: A case study from the wood pulp industry." Environmental Quality Management 17, no. 3 (2008): 55–65. http://dx.doi.org/10.1002/tqem.20176.
Повний текст джерела
5
Terziev, Nasko, Geoffrey Daniel, Grigori Torgovnikov, and Peter Vinden. "Effect of microwave treatment on the wood structure of Norway spruce and radiata pine." BioResources 15, no. 3 (May 29, 2020): 5616–26. http://dx.doi.org/10.15376/biores.15.3.5616-5626.
Повний текст джерелаАнотація:
Low permeability of many wood species causes problems during timber manufacturing, including long drying times, material losses after drying, and expensive drying processes. Impregnating low permeability timber with preservatives and resins is extremely difficult. In the pulp and paper industry, use of low permeability wood results in shallow chemical penetration, and it requires the use of small-sized chips, high chemical usage, and high-energy consumption. Microwave (MW) wood modification technology can provide solutions to many of these problems. The wood structural changes in Norway spruce and radiata pine after MW modification with 0.922 and 2.45 GHz of were investigated. High intensity MW application (specific MW power 22 to 25 W/cm3, applied energy 79 to 102 kWh/m3) to moist wood caused the following wood structural changes: pit opening and pit membrane rupture; middle lamella weakening and rupture; and ray cell wall destruction and check (voids) formation mainly in the radial-longitudinal plane caused by the destruction of rays and weak middle lamella regions. Microwave destruction of different wood structure elements provided a significant increase in wood permeability for liquids and gases. Knowledge of the effects of MW treatment to the wood structure elements allows assessment of opportunities for the use of microwave irradiation in wood technology.
6
Hubbe, Martin A. "Energy efficiency challenges in pulp and paper manufacturing: A tutorial review." BioResources 16, no. 4 (November 1, 2021): 8567–639. http://dx.doi.org/10.15376/biores.16.4.hubbe.
Повний текст джерелаАнотація:
The pulp and paper industry is highly energy-intensive. In mills that use chemical pulping, roughly half of the higher heating value of the cellulosic material used to manufacture the product typically is incinerated to generate steam and electricity that is needed to run the processes. Additional energy, much of it non-renewable, needs to be purchased. This review considers publications describing steps that pulp and paper facilities can take to operate more efficiently. Savings can be achieved, for instance, by minimizing unnecessary losses in exergy, which can be defined as the energy content relative to a standard ambient condition. Throughout the long series of unit operations comprising the conversion of wood material to sheets of paper, there are large opportunities to more closely approach a hypothetical ideal performance by following established best-practices.
7
Hubbe, Martin A. "Energy efficiency challenges in pulp and paper manufacturing: A tutorial review." BioResources 16, no. 4 (November 1, 2021): 8567–639. http://dx.doi.org/10.15376/biores.16.4.8567-8639.
Повний текст джерелаАнотація:
The pulp and paper industry is highly energy-intensive. In mills that use chemical pulping, roughly half of the higher heating value of the cellulosic material used to manufacture the product typically is incinerated to generate steam and electricity that is needed to run the processes. Additional energy, much of it non-renewable, needs to be purchased. This review considers publications describing steps that pulp and paper facilities can take to operate more efficiently. Savings can be achieved, for instance, by minimizing unnecessary losses in exergy, which can be defined as the energy content relative to a standard ambient condition. Throughout the long series of unit operations comprising the conversion of wood material to sheets of paper, there are large opportunities to more closely approach a hypothetical ideal performance by following established best-practices.
8
Bosco, Mtweve, Ekael Mbise, and Rwaichi Minja. "Production of Paper Pulp Using Sisal Fiber Waste from Sisal Spinning Processes." Tanzania Journal of Engineering and Technology 41, no. 2 (June 30, 2022): 150–57. http://dx.doi.org/10.52339/tjet.v41i2.788.
Повний текст джерелаАнотація:
Disposal of large volumes of textile waste is an escalating problem for textile industries. Sisal spinning industry is the one of the textile industries releasing large volumes of textile waste in the landfills. The rising costs, and reduction of available space together with increasing stringent environmental measures are making burying and land filling of textile waste, a declining option. This study therefore explores recycling options where the potential of using sisal fiber waste produced during sisal spinning processes as raw materials for the production of paper pulp was investigated. Sampling was done at 21stCentury Holdings Limited allocated at Chang’ombe industrial street Dar es Salaam mainly dealer of sisal yarns production. Materials were prepared and cut into small pieces of about ½ inches to reduce the fiber into unit lengths so as to achieve pulping required performance. Pulping process was achieved through Soda pulping techniques with two different effective alkali charges (EA-20% and EA-24%) for 240 minutes under maximum temperature 140 C, and liquor to fiber ratio 4:1by using Mathis Labomat dyeing Machine. The kappa number obtained was (25.5, 34.5) for material treated under EA 24% and EA 20% respectively, Percentage pulp yield were (47.1, 54.4) for EA 24% and EA20% pulp respectively. Freeness (630CFS, 555CSF) after refining at 4500rpm. Finally, the resulting pulp was used for hand sheet making and the sheets were tested for their mechanical properties; Grammage (61.1, 61.1) g/m2, Tensile index (9.9, 22.3) Nm/g, Tear index (13.3, 17.4) Nm2/g, burst index (1.7, 3.7 and 1.6) k.pa.m2/g and Elongation at break (2.02, 2.22) % for EA24% pulp, EA20% pulp respectively. The findings shows that sisal fiber wastes have a promising potential for paper pulp production compared to other non-wood raw material.
9
Martínez-García, Rebeca, P. Jagadesh, Osama Zaid, Adrian A. Șerbănoiu, Fernando J. Fraile-Fernández, Jesús de Prado-Gil, Shaker M. A. Qaidi, and Cătălina M. Grădinaru. "The Present State of the Use of Waste Wood Ash as an Eco-Efficient Construction Material: A Review." Materials 15, no. 15 (August 3, 2022): 5349. http://dx.doi.org/10.3390/ma15155349.
Повний текст джерелаАнотація:
A main global challenge is finding an alternative material for cement, which is a major source of pollution to the environment because it emits greenhouse gases. Investigators play a significant role in global waste disposal by developing appropriate methods for its effective utilization. Geopolymers are one of the best options for reusing all industrial wastes containing aluminosilicate and the best alternative materials for concrete applications. Waste wood ash (WWA) is used with other waste materials in geopolymer production and is found in pulp and paper, wood-burning industrial facilities, and wood-fired plants. On the other hand, the WWA manufacturing industry necessitates the acquisition of large tracts of land in rural areas, while some industries use incinerators to burn wood waste, which contributes to air pollution, a significant environmental problem. This review paper offers a comprehensive review of the current utilization of WWA with the partial replacement with other mineral materials, such as fly ash, as a base for geopolymer concrete and mortar production. A review of the usage of waste wood ash in the construction sector is offered, and development tendencies are assessed about mechanical, durability, and microstructural characteristics. The impacts of waste wood ash as a pozzolanic base for eco-concreting usages are summarized. According to the findings, incorporating WWA into concrete is useful to sustainable progress and waste reduction as the WWA mostly behaves as a filler in filling action and moderate amounts of WWA offer a fairly higher compressive strength to concrete. A detail study on the source of WWA on concrete mineralogy and properties must be performed to fill the potential research gap.
10
Azlin Azmi, Annur, and Siti Amira Othman. "Fabrication of magnetic sugarcane bagasse paper." IOP Conference Series: Materials Science and Engineering 1231, no. 1 (February 1, 2022): 012013. http://dx.doi.org/10.1088/1757-899x/1231/1/012013.
Повний текст джерелаАнотація:
Abstract Generally, development in the pulp and paper industry requires extensive cutting of trees, which in effect contributes to deforestation. The dramatic growth in demand for wood supply, combined with the increasingly increasing cost of timber, has created a surge of interest in the use of non-wood plant fibres for paper production in widely developed countries. The use of waste material in pulping and paper-based industries could be beneficial as it helps prevent the need for disposal, which currently increases agricultural costs and causes environmental deterioration due to pollution and fires. In this research, the sugarcane bagasse was dry and chopped into 5 cm in lengths. The fibre and pulp were separated and put in a pulp disintegrator then it was weighed and mixed with water. The paper that fabricates will be irradiated with gamma-ray and then followed by characterizing with Scanning Electron Microscope- Energy Dispersive X-Ray Analysis (SEM-EDX) and Fourier-transform infrared spectroscopy (FTIR). The SEM-EDX result shows that the weight and atomic percentage of the ferrite (Fe) increase after the irradiation. While for the FTIR, the entire sample exhibit the absorption range of 3400 to 2400 cm−1 region. The paper will be compared with the properties of multipurpose paper.
11
Curti, Rémi, Bertrand Marcon, Louis Denaud, and Robert Collet. "Effect of grain direction on cutting forces and chip geometry during green beech wood machining." BioResources 13, no. 3 (May 27, 2018): 5491–503. http://dx.doi.org/10.15376/biores.13.3.5491-5503.
Повний текст джерелаАнотація:
Proper valorization of the sawing wastes in industrial sawmills is a permanent issue with strong economic and environmental stakes. Most industrial sawmills are equipped with chipper-canter heads reducing the outer part of the logs into chips used in the pulp and paper industry. Optimization in canter use would increase the acceptable proportion of exploitable chips for this industry. With chipper-canters, the cutting direction varies along the cut. This study investigates the impact of the angle formed between the cutting direction and the grain direction on the required cutting force and the chips’ geometry. Orthogonal cutting is conducted to simulate the chipper-canter machining operation on green beech. To lower the cutting forces when machining, aiming for a cutting direction as parallel as possible to the wood fiber is necessary. However, if this angle is too low, the chips’ generated geometries prevent them from a proper valorization of this resource. A compromise with grain direction between 50° to 70° both limits the cutting forces and improves the steadiness of the chip fragmentation.
12
Plotnikov, Nikolay, and Galina Plotnikova. "Application of lignin in production wood-polymer composites." E3S Web of Conferences 164 (2020): 14011. http://dx.doi.org/10.1051/e3sconf/202016414011.
Повний текст джерелаАнотація:
The rational use of wood cannot be imagined without the use of synthetic resins and adhesives, on the basis of which all the main types of wood composite materials are made. The use of synthetic resins provides: production of high-quality glued products with an increased service life due to strength properties; reducing the material consumption of manufactured products and more complete use of low-grade raw materials; improve the fire, bio - and chemical resistance of manufactured materials. Due to the lower consumption of raw materials for the manufacture of glued parts, their cost is usually lower than that of solid wood parts. The international market of adhesives is represented by a wide range, in which 63% are synthetic adhesives. When wood is processed at pulp and paper enterprises, 40-50 million tons of alkaline lignin, 5 million tons of lignosulfonate, 3.5 million tons of technical hydrolytic lignin are produced annually in the world. In the future, the volume of industrial processing of wood will increase by 50-60% and therefore the issue of disposal of such waste is the most important task. Lignins in the form of various large- tonnage wastes are an environmental and technological problem for many chemical industry enterprises and adjacent residential areas.
13
Hoa, Doan Thai, Tran Dinh Man, and Ngo Viet Hau. "PRETREATMENT OF LIGNOCELLULOSIC BIOMASS FOR ENZYMATIC HYDROLYSIS." ASEAN Journal on Science and Technology for Development 25, no. 2 (November 22, 2017): 341–46. http://dx.doi.org/10.29037/ajstd.264.
Повний текст джерелаАнотація:
The cost of raw materials continues to be a limiting factor in the production of bio-ethanol from traditional raw materials, such as sugar and starch. At the same time, there are large amount of agricultural residues as well as industrial wastes that are of low or negative value (due to costs of current effluent disposal methods). Dilute sulfuric acid pretreatment of elephant grass and wood residues for the enzymatic hydrolysis of cellulose has been investigated in this study. Elephant grass (agricultural residue) and sawdust (Pulp and Paper Industry waste) with a small particulate size were treated using different dilute sulfuric acid concentrations at a temperature of 140-170°C within 0.5-3 hours. The appropriate pretreatment conditions give the highest yield of soluble saccharides and total reducing sugars.
14
Sandquist, David, Armin Thumm, and Alan R. Dickson. "The influence of fines material on the mechanical performance of wood fiber polypropylene composites." BioResources 15, no. 1 (November 26, 2019): 457–68. http://dx.doi.org/10.15376/biores.15.1.457-468.
Повний текст джерелаАнотація:
With an increasing interest in a wider scope of biomass feedstocks for biocomposite production, the potential influence of a possibly higher proportion of fines material needs to be addressed. In the pulp and paper industry, at least two major classes of fines material are identified; blocky fines and fibrillar fines. These differ in their aspect ratio, with the later having substantially higher aspect ratio. In this study, the physical impact of blocky fines (from CTMP refining) and fibrillar fines (produced via Super® Masscolloider refining) on a wet formed compression molded polypropylene (PP) matrix biocomposites were compared. The results indicated that in wet formed compression molded polymer matrix composites, both blocky (CTMP) and fibrillar (SMC) fines have a significant negative impact on modulus of rupture (MoR). Additionally, blocky CTMP fines also have a significant negative impact on modulus of elasticity (MoE). It is postulated that this is due to fibril agglomeration, in the case of fibrillar fines, and low aspect ratio in combination with some agglomeration, in the case of blocky CTMP fines. The indication is that fines material that has not been treated to minimize agglomeration has limited benefits as a reinforcing agent, and only a negative impact on most properties in wet formed compression molded polymer matrix composites.
15
Xu, Yongjian, Shenglin Chen, Xin Du, and Xiaopeng Yue. "Spray atomization simulation of bamboo kraft black liquor with high solid content at splash-plate nozzle." BioResources 16, no. 4 (August 5, 2021): 6599–612. http://dx.doi.org/10.15376/biores.16.4.6599-6612.
Повний текст джерелаАнотація:
Increasing the solids content of pulping black liquor burned in a furnace is a development trend of the alkali recovery system in the pulp and paper industry. However, the viscosity of kraft black liquor increases exponentially with an increase in solids content, especially in the case of non-wood pulping black liquor, such as bamboo. This brings great difficulties to the pulping system and atomization of black liquor at the splash-plate nozzle, which is a complete atomization unit constituted of a splash nozzle and a splash plate. To obtain instructive results for industry, a simulation of the atomization process was made using Fluent software for the bamboo kraft black liquor with solids contents of 70 wt% and 80 wt%, which flowed through splash nozzles with the diameter of 22 or 20 mm. The studies were conducted on the distribution of flow field in the nozzle and atomization region through changing the injection pressure and nozzle diameter. The variation of atomization characteristic parameters, such as liquid film thickness, and breakup length, were elucidated. The results reveal the relationship between spray atomization with injection pressure and nozzle diameter, which provides a theoretical basis for improving the concentration of black liquor entering alkali recovery in the future.
16
Jardim, Juliana M., Peter W. Hart, Lucian Lucia, Hasan Jameel, and Houmin Chang. "A quantitative comparison of the precipitation behavior of lignin from sweetgum and pine kraft black liquors." BioResources 15, no. 3 (May 27, 2020): 5464–80. http://dx.doi.org/10.15376/biores.15.3.5464-5480.
Повний текст джерелаАнотація:
Lignin is a by-product of the pulp and paper industry that can be precipitated by acidification from black liquor as a potential feedstock for valuable green materials. Precipitation and quantification of lignin from softwood black liquors have been documented and commercialized with well-established methods; however, applying those methods to the precipitation of lignin from hardwood black liquors has produced low lignin yields. A need to understand the main differences between hardwood and softwood lignin precipitation prompted the current investigation. Multiple black liquor samples from sweetgum and pine pulping were obtained at different times of standard kraft cooks. Two lignin fractions were precipitated from each of these black liquors, one at pH 9.5 and one at pH 2.5. Detailed lignin and carbohydrate material balances were performed around each of the sample sets, starting with the wood and ending with precipitated lignin fractions. For all conditions tested, the amount and purity of pine lignin precipitated were superior to sweetgum lignin. The maximum recovery for sweetgum lignin was 69.7%, while for pine lignin, it was 90.9%.
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Gençer, Ayhan, Ahmet Can, Aysun Mustak, and Ülkü Burcu Gitti. "The effect of using alum mordant in wild cherry bark dyestuff for the production of UV resistant colored paper." Drvna industrija 70, no. 4 (December 13, 2019): 383–90. http://dx.doi.org/10.5552/drvind.2019.1854.
Повний текст джерелаАнотація:
Depending on the use of wood in the forest industry, wood bark is mostly peeled and used as fuel. The ash and smoke left from the burned bark causes environmental pollution. The most environmentally friendly method for waste disposal is to convert waste into a valuable commodity. In this study, cherry tree bark was used as a dyestuff in paper production. Wild cherry (Cerasus avium L.) bark was boiled with water and KOH. The purpose of using KOH is to increase the solubility of the bark compounds. The chemi-thermomechanical pulp (CTMP) was dyed using the dyestuff. The alum mordant is used to fi x the dyestuff. Paper can be exposed to external influences (mechanical, physical and biological) depending on the place of use. One of these effects is sunshine. When paper is exposed to direct or indirect sunlight, paper changes its color. Depending on the place of use, it is expected that the color of the paper will not be affected by the sunlight or that it will provide long-term strength after the application. Accelerated weathering test was chosen to measure the UV resistance of the dyestuff. The results have shown that the mordant has a significant effect on the fixation of dyestuff. After a total of 150 hours of weathering test, the color change was observed to be the lowest in the paper samples to which alum mordant was added to the dyestuff.
18
Hassan, Khaled T. S., El-Sayed A. E. Kandeel, Ibrahim E. A. Kherallah, Hosny A. Abou-Gazia, and Fatma M. M. Hassan. "Pinus halepensis and Eucalyptus camaldulensis grown in Egypt: A comparison between stem and branch properties for pulp and paper making." BioResources 15, no. 4 (August 19, 2020): 7598–614. http://dx.doi.org/10.15376/biores.15.4.7598-7614.
Повний текст джерелаАнотація:
The utilization of branchwood as lignocellulosic raw material source for paper production may have the potential of solving the problem of the availability of raw material in the pulp and paper industry. This study therefore compared the chemical composition and fiber morphological indices (according to Franklin’s method) of stemwood and branchwood in Eucalyptus camaldulensis and Pinus halepensis trees grown in Egypt. The statistical analysis showed a significant effect of species, wood type (stem and branchwood), and their interaction on the measured chemical constituents and fiber morphological indices at 0.05 significance level. In both genera, the stemwood exhibited a higher percentage of cellulose and hemicellulose and was lower in lignin, total extractives, and ash than those measured in branchwood. Also in both genera, the stemwood was higher in fiber length, Runkel ratio, rigidity coefficient, Muhlsteph ratio, and Luce’s shape factor, and lower in basic density and flexibility coefficient than those in branchwood. Based on the chemical analysis and the fiber morphological indices, the stemwood and branchwood of both species were suitable for paper production with various qualities. Moreover, good correlations were found in both stem and branchwood between the basic density and the fiber wall thickness and fiber lumen diameter. ln contrast, there was an independent association between the stemwood basic density and the fiber length, and this relationship in branchwood was positive for both genera.
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Stelte, Wolfgang, Anand R. Sanadi, Lei Shang, Jens K. Holm, Jesper Ahrenfeldt, and Ulrik B. Henriksen. "Recent developments in biomass pelletization – A review." BioResources 7, no. 3 (July 30, 2012): 4451–90. http://dx.doi.org/10.15376/biores.7.3.4451-4490.
Повний текст джерелаАнотація:
The depletion of fossil fuels and the need to reduce greenhouse gas emissions has resulted in a strong growth of biomass utilization for heat and power production. Attempts to overcome the poor handling properties of biomass, i.e. its low bulk density and inhomogeneous structure, have resulted in an increasing interest in biomass densification technologies, such as pelletization and briquetting. The global pellet market has developed quickly, and strong growth is expected for the coming years. Due to an increase in demand for biomass, the traditionally used wood residues from sawmills and pulp and paper industry are not sufficient to meet future needs. An extended raw material base consisting of a broad variety of fibrous residues from agriculture and food industries, as well as thermal pre-treatment processes, provides new challenges for the pellet industry. Pellet production has been an established process for several decades, but only in the past five years has there been significant progress made to understand the key factors affecting pelletizing processes. A good understanding about the pelletizing process, especially the processing parameters and their effect on pellet formation and bonding are important for process and product optimization. The present review provides a comprehensive overview of the latest insights into the biomass pelletization processes, such as the forces involved in the pelletizing processes, modeling, bonding, and adhesive mechanisms. Furthermore, thermal pretreatment of the biomass, i.e. torrefaction and other thermal treatment to enhance the fuel properties of biomass pellets are discussed.
20
Stelte, Wolfgang, Anand R. Sanadi, Lei Shang, Jens K. Holm, Jesper Ahrenfeldt, and Ulrik B. Henriksen. "Recent developments in biomass pelletization – A review." BioResources 7, no. 3 (July 30, 2012): 4451–90. http://dx.doi.org/10.15376/biores.7.3.stelte.
Повний текст джерелаАнотація:
The depletion of fossil fuels and the need to reduce greenhouse gas emissions has resulted in a strong growth of biomass utilization for heat and power production. Attempts to overcome the poor handling properties of biomass, i.e. its low bulk density and inhomogeneous structure, have resulted in an increasing interest in biomass densification technologies, such as pelletization and briquetting. The global pellet market has developed quickly, and strong growth is expected for the coming years. Due to an increase in demand for biomass, the traditionally used wood residues from sawmills and pulp and paper industry are not sufficient to meet future needs. An extended raw material base consisting of a broad variety of fibrous residues from agriculture and food industries, as well as thermal pre-treatment processes, provides new challenges for the pellet industry. Pellet production has been an established process for several decades, but only in the past five years has there been significant progress made to understand the key factors affecting pelletizing processes. A good understanding about the pelletizing process, especially the processing parameters and their effect on pellet formation and bonding are important for process and product optimization. The present review provides a comprehensive overview of the latest insights into the biomass pelletization processes, such as the forces involved in the pelletizing processes, modeling, bonding, and adhesive mechanisms. Furthermore, thermal pretreatment of the biomass, i.e. torrefaction and other thermal treatment to enhance the fuel properties of biomass pellets are discussed.
21
Moise, Ioan Valentin, Mihaela Ene, Constantin Daniel Negut, Mihalis Cutrubinis, and Maria Mihaela Manea. "Radiation processing for cultural heritage preservation – Romanian experience." Nukleonika 62, no. 4 (December 1, 2017): 253–60. http://dx.doi.org/10.1515/nuka-2017-0037.
Повний текст джерелаАнотація:
Abstract Radiation sterilization has been considered a mass decontamination technique for biodegradable cultural heritage (CH) since its widespread application in the medical field. Initial experiments have revealed advantages, for example, efficiency and effectiveness, but also disadvantages, namely “side effects” concerning CH materials. More than 50 years later, the adequacy of ionizing radiation for some CH artefacts is still the subject of discussion. The main reason why is that science and industry are not yet able to provide a more efficient technique for treating mass decontamination. For wooden items, there is general agreement that the irradiation dose required for insect eradication is not damaging, even in the case of polychromed wood. For cellulose pulp (paper), there is a reduction in polymerization degree (DP) at the high doses necessary to stop the attack of fungi, but this should be considered taking into account the purpose of the treatment. Emergency or rescue treatments are necessary to mitigate the consequences of accidents or improper storage conditions. In some cases (archives), the value of written information is greater than the historical value of the paper support. For other materials, namely textiles, leather and parchment, less research has been published on the effect of ionizing radiation treatment. As a general rule, irradiation is not necessary when only a few CH elements are present that are affected by biological contamination since restorers can solve the problem by classical means. The need for radiation treatment arises when large collections (hundreds, thousands or even more elements) are heavily affected by the biological attack. In Romania, the IRASM gamma irradiator of IFIN-HH is receiving an increasing number of requests for CH treatment, mainly due to an intensive research programme concerning this topic and close liaison with CH owners or administrators. Besides reviewing the scientific results obtained in Romania and abroad, this paper presents some examples from experiences in Romania.
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Claesson, Tommy, Sirkku Sarenbo, Peter Mellbo, and Olof Stålnacke. "Nutrient recycling by using residues from forest industry." Linnaeus Eco-Tech, January 29, 2020, 55–61. http://dx.doi.org/10.15626/eco-tech.2005.005.
Повний текст джерелаАнотація:
A major part of residues from pulp industry are deposited as waste at high disposal costs. Thispaper summarizes a five-year research project concerning implementation of an industrial,automatic roll-pelletizing method at a heating plant in the city of Kalmar, Sweden and presentsthe visions of the newly initiated research project where pulp industry residues are recycledtogether with wood ash. Also combustion issues are included.
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"High-density particleboard made from agro-industrial waste and different adhesives." BioResources 14, no. 3 (May 10, 2019): 5162–70. http://dx.doi.org/10.15376/biores.14.3.5162-5170.
Повний текст джерелаАнотація:
Particleboards were made using particles from sugarcane bagasse and eucalyptus residues of the pulp industry. The particleboard properties were evaluated according to ABNT NBR 14810-1 (2013), ABNT NBR 14810-2 (2013), and ANSI A208.1 (1999) standards, which compared the efficiency of castor oil-based polyurethane resin (PU-Castor) and urea-formaldehyde resin (UF). The particleboards were composed of 60% wood particles and 40% bagasse, with a 10% adhesive dose based on the dry mass of particles. The following parameters were evaluated: apparent density, moisture content (MC), thickness swelling after 24 h, modulus of rupture (MOR), modulus of elasticity to static bending (MOE), and internal bond strength of panels (IB). The results obtained demonstrated the potential use of eucalyptus and sugarcane bagasse residues in the production of high-density particleboards. The panels produced with PU-Castor showed greater efficiency, and their physical and mechanical properties were compatible with the requirements of the Brazilian standard for P4 panels (structural panels for use in dry conditions) and the American standard for H-3 panels (high industrial density).
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"An overview of the Australian biomass resources and utilization technologies." BioResources 1, no. 1 (August 1, 2006): 93–115. http://dx.doi.org/10.15376/biores.1.1.93-115.
Повний текст джерелаАнотація:
Information on Australian biomass resources including bagasse, black liquor from paper pulp production, wood waste and forestry residues, energy crops, crop wastes, food and agricultural wet waste, and municipal solid wastes is provided in the review. The characteristics of the Australian biomass are typical of those of other countries, i.e. high moisture and volatile matter, low heating value and density, and low sulfur and nitrogen content, but high Ca and Mg for woody biomass. The characteristics influence biomass utilization. Biomass is used extensively at present within Australia , primarily for domestic heating, as bagasse in the sugar industry, and for electricity generation. Biomass usage for electricity generation is increasing and is expected to reach 5.2 Mt/year by 2019-20. Exports, as wood chips, are approximately 10 Mt/year in 2000-01. Forestry residues have been estimated to be 23 Mt/year. Current technologies that utilize biomass in Australia include those for electricity and heat by direct combustion, cofiring with coal and fluidized bed combustion), for biogas generation (from landfills, and aerobic digestion, and as bio-liquids. Related to bio-liquid fuels, ethanol production from molasses and wheat is making progress. The resultant ethanol is used as a petrol extender, and a bio-diesel process is under development.
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Oksanen, Juha, Riikka Keskinen, Jaakko Heikkinen, Janne Kaseva, and Kimmo Rasa. "The Effects of Mixing Pulp and Paper Mill Sludge Into Wood Bark on Storage-Related Environmental Impacts and Heating Value." Waste and Biomass Valorization, March 7, 2022. http://dx.doi.org/10.1007/s12649-022-01716-x.
Повний текст джерелаАнотація:
Abstract The pulping industry generates vast amounts of bark and wastewater treatment sludges, which are combined and stored in stacks, often in the open air, prior to combustion for energy. The effects of incorporating sludge into bark on heating value and storage-related environmental impacts were investigated in laboratory and outdoors. Biological degradation was found to be higher in treatments containing 25% sludge (B75S25) and 50% sludge (B50S50) in comparison with pure bark (B100). Mean monthly dry mass loss was 2.1% (B100), 3.3% (B75S25), and 3.7% (B50S50) in the laboratory and 2.7, 4.2, and 4.8%, respectively, outdoors. Addition of sludge maintained degradation activity at low temperatures (+ 3 °C). Co-storage of sludge and bark led to loss of energy, mainly due to increased loss of biomass and increased moisture, which governed the heating value. Cumulative methane emissions were higher from the sludge-containing treatments than from pure bark, but emissions of nitrogen-containing gases (N2O and NH3) were negligible throughout. Sludge addition roughly halved the cumulative chemical oxygen demand (COD) of leachate and minimized its concentration of phosphate-P. However, larger amounts of inorganic elements were released from the sludge-containing treatments. Overall, these results indicate that finding alternative uses for the sludge fraction would be beneficial. Graphical Abstract