Lignocellulosic biofuel production: review of alternatives

Machineni, Lakshmi

doi:10.1007/s13399-019-00445-x

Cited by 69 publications

(26 citation statements)

References 124 publications

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“…The major shortcomings of the technique are the requirement of high temperature and pressure, high expenses, oxidizing agents, and unique equipment ( Xu et al, 2020 ; Das et al, 2021 ). Furthermore, another major drawback of the treatment is that it has low efficiency for generating fermentable sugars, attributed to degrade a large amount of hemicellulose ( Lucas et al, 2012 ; Machineni, 2020 ).…”

Section: Oxidative Pretreatmentmentioning

confidence: 99%

Advances in Pretreatment of Straw Biomass for Sugar Production

Tan

et al. 2021

Front. Chem.

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Straw biomass is an inexpensive, sustainable, and abundant renewable feedstock for the production of valuable chemicals and biofuels, which can surmount the main drawbacks such as greenhouse gas emission and environmental pollution, aroused from the consumption of fossil fuels. It is rich in organic content but is not sufficient for extensive applications because of its natural recalcitrance. Therefore, suitable pretreatment is a prerequisite for the efficient production of fermentable sugars by enzymatic hydrolysis. Here, we provide an overview of various pretreatment methods to effectively separate the major components such as hemicellulose, cellulose, and lignin and enhance the accessibility and susceptibility of every single component. This review outlines the diverse approaches (e.g., chemical, physical, biological, and combined treatments) for the excellent conversion of straw biomass to fermentable sugars, summarizes the benefits and drawbacks of each pretreatment method, and proposes some investigation prospects for the future pretreatments.

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Section: Oxidative Pretreatmentmentioning

confidence: 99%

Advances in Pretreatment of Straw Biomass for Sugar Production

Tan

et al. 2021

Front. Chem.

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“…Controlled delignification and depolymerization of paddy residues into simpler monomers, called platform molecules, are rather challenging and specifically mandatory on a technical scale and this problem is yet to be solved, for the synthesis of bioenergy. A variety of pretreatment methods have been applied for lignocellulose biomass [14,18,19]. It is worth noting that the pretreatment step not only helps to release platform molecules for higher degradation by anaerobic consortia but also helps to remove toxic metal elements from biomass, which are not biodegradable and hence long-term accumulation in anaerobic digesters inhibits stable digestion of biomass in the long run.…”

Section: Anaerobic Digestion Of Lignocellulosic Biomassmentioning

confidence: 99%

Contribution of Anaerobic Digestion Coupled with Algal System towards Zero Waste

Machineni¹,

Rao²,

Rao³

2021

Biogas - Recent Advances and Integrated Approaches

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Global environmental protection is of immediate concern and it can only be achieved by avoiding the use of fossil fuels. In addition, waste disposal and management could be made remunerative through the generation of renewable energy so that sustainable development is ensured. India is an agriculture-based country, and paddy residues such as rice straw and rice husk are the largest agricultural wastes in India. Currently, the common practice to dispose paddy residues is through field burning, but this has adverse effects on the air quality and consequently on people's health. However, utilization of lignocellulosic and non-food agricultural residues such as paddy residue for biogas generation by solid-stated anaerobic digestion (AD) is promising and this can substitute fossil fuels. Paddy residues for biogas production via AD has not been widely adopted because of its complex cell wall structure making it resistant to digestion by microbial attack. In addition, sequestration of carbon dioxide from biogas by algal biomass cultivated in an integrated algal bioreactor could be a promising option for biogas enrichment due to its unmatched advantages. This chapter presents the overview on utilization of non-edible residues for biogas production and its enrichment via algal biomass by means of circular bioeconomy.

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“…Plant biomass is mostly composed of lignin (13.6-28.1%), cellulose (40.6-51.2%) and hemicellulose (28.5-37.2%) biopolymer [64], which serves as raw material for production of fuels. However, critical step involved in biofuel production is the conversion of biomass to sugars [65]. It is therefore important to carefully choose the pretreatment process based on the biomass and an optimal pretreatment process towards better yield of sugar with the low energy input [66].…”

Section: Pretreatment and Hydrolysis For Extraction Of Macroalgal Sugarmentioning

confidence: 99%

Bioethanol from macroalgae: Prospects and challenges

Ramachandra

Hebbale

2020

Renewable and Sustainable Energy Reviews

123

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Burgeoning dependence on fossil fuels for transport and industrial sectors has been posing challenges such as depletion of fossil fuel reserves, enhanced greenhouse gas (GHG) footprint, with the imminent changes in the climate, etc. This has necessitated an exploration of sustainable, eco-friendly and carbon neutral energy alternatives. Recent studies on biofuels indicate that algal biomass, particularly from marine macroalgae (seaweeds) have the potential to supplement oil fuel. Marine macroalgae are fast growing and carbohydrate rich biomass having advantage over other biofuel feedstock in terms of land dependence, freshwater requirements, not competing with food crops, which were the inherent drawback of the first-and second-generation feedstock. The present communication reviews the macroalgal feedstock availability, screening and selection of viable feedstock based on the biochemical composition, process involved, scope and opportunities in bioethanol production as well as technology interventions. The prospect of bioethanol production from algal feedstock of Central West Coast of India has been evaluated taking into account challenges (feedstock sustenance, technical feasibility, economic viability) in order to achieve energy sustainability. The green algae exhibited growth during all seasons and highest total carbohydrate was recorded from green seaweed Ulva lactuca (62.15 � 12.8%). Elemental (CHN) analyses of seaweed samples indicate 25.31-37.95% of carbon, 4.52-6.48% hydrogen and 1.88-4.36% Nitrogen. Highest carbon, hydrogen and nitrogen content were recorded respectively from G.pusillum (C: 37.95%), G. pusillum (H: 6.48%) and E.intestinalis (N: 4.36%). Green seaweeds are rich in cellulose content (>10%) compared to other seaweeds (2-10%). Higher cellulose content was estimated in U.lactuca (14.03 � 0.14%), followed by E. intestinalis (12.10 � 0.53%) and C.media (10.53 � 0.17%). Cellulose is a glucan present in green seaweeds, which can easily be hydrolysed through enzyme and subsequently fermented to produce bioethanol. Lower sugar removal in acid hydrolysate neutralization process (Na 2 CO 3) was recorded in U.lactuca (39.8%) and E.intestinalis (14.7%). Highest ethanol yield of 1.63 g and 0.49 g achieving 25.8% and 77.4% efficiency in SHF (Separate Hydrolysis and Fermentation) and SSF (Simultaneous Saccharification and Fermentation) process respectively was recorded for green alga E. intestinalis.

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Lignocellulosic biofuel production: review of alternatives

Cited by 69 publications

References 124 publications

Advances in Pretreatment of Straw Biomass for Sugar Production

Advances in Pretreatment of Straw Biomass for Sugar Production

Contribution of Anaerobic Digestion Coupled with Algal System towards Zero Waste

Bioethanol from macroalgae: Prospects and challenges

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