Algal Biomass Pretreatment for Improved Biofuel Production

Mishra, Vishal; Dubey, Akhilesh; Prajapti, Sanjeev Kumar

doi:10.1007/978-3-319-51010-1_13

Cited by 13 publications

(9 citation statements)

References 64 publications

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“…We suspect that some protein-like components are difficult for microorganisms to degrade. For example, proteoglycan (an inert biopolymer containing CHNO) is an important component of macroalgal cell walls that is relatively resistant to microbial degradation …”

Section: Discussionmentioning

confidence: 99%

Green Tides Significantly Alter the Molecular Composition and Properties of Coastal DOC and Perform Dissolved Carbon Sequestration

Feng

Xiong

et al. 2022

Environ. Sci. Technol.

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Despite green tides (or macroalgal blooms) having multiple negative effects, it is thought that they have a positive effect on carbon sequestration, although this aspect is rarely studied. Here, during the world’s largest green tide (caused by Ulva prolifera) in the Yellow Sea, the concentration of dissolved organic carbon (DOC) increased by 20–37% in intensive macroalgal areas, and thousands of new molecular formulas rich in CHNO and CHOS were introduced. The DOC molecular species derived from U. prolifera constituted ∼18% of the total DOC molecular species in the seawater of bloom area, indicating the profound effect that green tides have on shaping coastal DOC. In addition, 46% of the macroalgae-derived DOC was labile DOC (LDOC), which had only a short residence time due to rapid microbial utilization. The remaining 54% was recalcitrant DOC (RDOC) rich in humic-like substances, polycyclic aromatics, and highly aromatic compounds that resisted microbial degradation and therefore have the potential to play a role in long-term carbon sequestration. Notably, source analysis showed that in addition to the microbial carbon pump, macroalgae are also an important source of RDOC. The number of RDOC molecular species contributed by macroalgae even exceed (77 vs 23%) that contributed by microorganisms.

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Section: Discussionmentioning

confidence: 99%

Green Tides Significantly Alter the Molecular Composition and Properties of Coastal DOC and Perform Dissolved Carbon Sequestration

Feng

Xiong

et al. 2022

Environ. Sci. Technol.

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“…The second mechanical technique is bead beating, where the biomass slurry is spun using high-speed spinning mills and beads to damage the cell walls (Kumar et al 2015). The highest lipid recovery from agitated bead beating to date is 33 mol% of lipids per 100 g of algae Nannochloropsis cells (Mishra et al 2017;Gouveia et al 2012). The next approach is the biochemical approach, where different types of solvents are used to selectively extract lipids from the endogenous cells.…”

Section: Algal Lipid Extraction As Pretreatmentmentioning

confidence: 99%

Algal biomass dual roles in phycoremediation of wastewater and production of bioenergy and value-added products

Razaviarani

Arab

Lerdwanawattana

et al. 2022

Int. J. Environ. Sci. Technol.

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Algal biomass has been gaining attention over the last decades as it is versatile and can be used in different industries, such as wastewater treatment and bioenergy industries. Microalgae are mixotrophic microorganisms that have potential to utilize nitrogen and phosphate (nutrients) and remove organic matters from wastewater streams. Phycoremediation is an intriguing and cost-efficient technique to simultaneously remove heavy metals from wastewater while removing nutrients and organic matters. The cultivated and produced algal biomass can be a promising candidate and a sustainable feedstock to produce biofuels (e.g., biodiesel, bio-alcohol, and bio-oil) and value-added products such as biochar, glycerol, functional food, and pigments. The algae suspended cultivation systems, WSP and HRAP, are efficient methods for the wastewater treatment in shallow ponds with no mechanical aeration and less required energy consumption, but when a short HRT and minimum evaporation losses are key points in the algal cultivation the PBRs are recommended. It was reported that biosorption and bioaccumulation are the two promising techniques of phycoremediation. Studies showed that among the current processes of algal biomass conversion to biofuels, transesterification of algal lipids and pyrolysis of algal biomass were found to be the most efficient techniques. This review paper investigates the applications of algal biomass in the phycoremediation of wastewater, productions of bioenergy and value-added products by reviewing articles mainly published over the last five years. Graphical abstract

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“…The focus of research has been on steam explosion, autoclave, and freeze-drying. 71 Steam explosion is a steam-based pretreatment method in which biomass slurry is suddenly depressurized after exposure to a certain period at a temperature of 180-240°C and a pressure of 1-3.45 MPa, respectively, resulting in cell rupture and further release of intracellular components. 72 The technology also has two unique advantages: (i) The first step in the oil refining process is achieved by contact with liquid water above 100°C.…”

Section: Mechanical Pretreatmentsmentioning

confidence: 99%

Research advancement and commercialization of microalgae edible oil: a review

Xue

et al. 2021

J Sci Food Agric

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The global food crisis has led to a great deal of attention being given to microalgal oil as a sustainable natural food source. This article provides an overview of the progress and future directions in promoting the commercialization of microalgal edible oils, including microalgal triglyceride accumulation, suitable edible oil culture strategies for high nutritional value, metabolic engineering, production, and downstream technologies. The integration of the production process, biosafety, and the economic sustainability of microalgal oil production are analyzed for their critical roles in the commercialization of microalgal edible oil to provide a theoretical and scientific basis for the comprehensive development and utilization of microalgal edible oil.

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Algal Biomass Pretreatment for Improved Biofuel Production

Cited by 13 publications

References 64 publications

Green Tides Significantly Alter the Molecular Composition and Properties of Coastal DOC and Perform Dissolved Carbon Sequestration

Green Tides Significantly Alter the Molecular Composition and Properties of Coastal DOC and Perform Dissolved Carbon Sequestration

Algal biomass dual roles in phycoremediation of wastewater and production of bioenergy and value-added products

Research advancement and commercialization of microalgae edible oil: a review

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