Recent advances and challenges of inter-disciplinary biomass valorization by integrating hydrothermal and biological techniques

Song, Bing; Lin, Richen; Lam, Chun Ho; Wu, Hao; Tsui, To-Hung; Yu, Yun

doi:10.1016/j.rser.2020.110370

Cited by 133 publications

(80 citation statements)

References 209 publications

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“…A wide range of by-products can be yielded through biomass waste to energy valorisation technologies. Different approaches to biomass waste valorisation have been used in converting waste into value-added products [94] such as solid biofuel, gaseous biofuel, and liquid biofuel with respect to biochemical or thermochemical processes. In direct combustion, heat is generated (exothermic) to produce electricity, whereas in gasification and pyrolysis, heat is used (exothermic) in an oxygen-lean environment to produce bio-oil, char, chemical, and syngas, and in an anaerobic environment, digestion, biogas, and bioethanol are produced [94].…”

Section: Oil Palm Residues Valorisation Into Biofuel and Bioenergy Productionmentioning

confidence: 99%

The Utilisation of Palm Oil and Oil Palm Residues and the Related Challenges as a Sustainable Alternative in Biofuel, Bioenergy, and Transportation Sector: A Review

et al. 2021

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The importance of energy demands that have increased exponentially over the past century has led to the sourcing of other ideal power solutions as the potential replacement alternative to the conventional fossil fuel. However, the utilisation of fossil fuel has created severe environmental issues. The identification of other renewable sources is beneficial to replace the energy utilisation globally. Biomass is a highly favourable sustainable alternative to renewable resources that can produce cleaner, cheaper, and readily available energy sources in the future. The palm oil industry is essentially ideal for the availability of abundant biomass resources, where the multifaceted residues are vital for energy production through the conversion of biomass waste into value-added products simultaneously. This article discusses the utilisation of palm oil and its residues in the energy and transportation sector. Assessment and evaluation on the feasibility of palm oil and its residues were made on the current valorisation methods such as thermochemical and biochemical techniques. Their potential as transportation fuels were concurrently reviewed. This is followed by a discussion on future challenges of palm oil industries that will take place globally, including the prospects from government and nongovernment organisations for the development of palm oil as a sustainable alternative replacement to fossil fuel. Hence, this review aims to provide further insight into the possibilities of palm oil and its residues towards sustainable development with reduced environmental-related issues.

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Section: Oil Palm Residues Valorisation Into Biofuel and Bioenergy Productionmentioning

confidence: 99%

The Utilisation of Palm Oil and Oil Palm Residues and the Related Challenges as a Sustainable Alternative in Biofuel, Bioenergy, and Transportation Sector: A Review

et al. 2021

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“…Hydrothermal treatment of wood can be generally classified into three categories—namely, supercritical water treatment, subcritical water treatment, and ambient liquid-water treatment [ 18 ]. The difference between these methods is the temperature applied during the treatment.…”

Section: Hydrothermal Modification Of Woodmentioning

confidence: 99%

“…Nowadays, the hydrothermal modification of wood in different media is one of the most prominent methods among the thermal treatment techniques [ 16 , 17 ]. The notion of hydrothermal modification can be largely defined on the basis of a variety of temperatures and pressures [ 18 ]. In addition, it can be performed in the presence of steam or liquid water under pressure or vacuum at various temperature levels, and it can affect the various characteristics of wood.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Modification of Wood: A Review

et al. 2021

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Wood is a versatile material that is used for various purposes due to its good properties, such as its aesthetic properties, acoustic properties, mechanical properties, thermal properties, etc. Its poor dimensional stability and low natural durability are the main obstacles that limit its use in mechanical applications. Therefore, modification is needed to improve these properties. The hydrothermal modification of wood exposes wood samples to elevated temperatures and pressure levels by using steam, water, or a buffer solution as the treating medium, or by using superheated steam. Abundant studies regarding hydrothermally treated wood were carried out, but the negative effect on the wood’s strength is one of the limitations. This is a method that boosts the dimensional stability and improves the decay resistance of wood with minimal decrements of the strength properties. As an ecofriendly and cost-effective method, the hydrothermal modification of wood is also a promising alternative to conventional chemical techniques for treating wood. Researchers are attracted to the hydrothermal modification process because of its unique qualities in treating wood. There are many scientific articles on the hydrothermal modification of wood, and many aspects of hydrothermal modification are summarized in review papers in this field. This paper reviews the hydrothermally modified mechanical properties of wood and their potential applications. Furthermore, this article reviews the effects of hydrothermal modification on the various properties of wood, such as the dimensional stability, chemical properties, and durability against termites and fungi. The merits and demerits of hydrothermal wood modification, the effectiveness of using different media in hydrothermal modification, and its comparison with other treating techniques are discussed.

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“…A recent review discussed integrating hydrothermal and biochemical routes in biomass utilisation from a circular bioeconomy approach (Song et al 2021). The thermochemical methods usually involve a high energy intake along with solvent or catalyst addition.…”

Section: Introductionmentioning

confidence: 99%

Conversion of biomass to biofuels and life cycle assessment: a review

et al. 2021

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The global energy demand is projected to rise by almost 28% by 2040 compared to current levels. Biomass is a promising energy source for producing either solid or liquid fuels. Biofuels are alternatives to fossil fuels to reduce anthropogenic greenhouse gas emissions. Nonetheless, policy decisions for biofuels should be based on evidence that biofuels are produced in a sustainable manner. To this end, life cycle assessment (LCA) provides information on environmental impacts associated with biofuel production chains. Here, we review advances in biomass conversion to biofuels and their environmental impact by life cycle assessment. Processes are gasification, combustion, pyrolysis, enzymatic hydrolysis routes and fermentation. Thermochemical processes are classified into low temperature, below 300 °C, and high temperature, higher than 300 °C, i.e. gasification, combustion and pyrolysis. Pyrolysis is promising because it operates at a relatively lower temperature of up to 500 °C, compared to gasification, which operates at 800–1300 °C. We focus on 1) the drawbacks and advantages of the thermochemical and biochemical conversion routes of biomass into various fuels and the possibility of integrating these routes for better process efficiency; 2) methodological approaches and key findings from 40 LCA studies on biomass to biofuel conversion pathways published from 2019 to 2021; and 3) bibliometric trends and knowledge gaps in biomass conversion into biofuels using thermochemical and biochemical routes. The integration of hydrothermal and biochemical routes is promising for the circular economy.

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Recent advances and challenges of inter-disciplinary biomass valorization by integrating hydrothermal and biological techniques

Cited by 133 publications

References 209 publications

The Utilisation of Palm Oil and Oil Palm Residues and the Related Challenges as a Sustainable Alternative in Biofuel, Bioenergy, and Transportation Sector: A Review

The Utilisation of Palm Oil and Oil Palm Residues and the Related Challenges as a Sustainable Alternative in Biofuel, Bioenergy, and Transportation Sector: A Review

Hydrothermal Modification of Wood: A Review

Conversion of biomass to biofuels and life cycle assessment: a review

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