Environmental performances of diluents and hydrogen production pathways from microalgae in cold climates: Open raceway ponds and photobioreactors coupled with thermochemical conversion

Pankratz, Stan; Kumar, M. Dinesh; Oyedun, Adetoyese Olajire; Gemechu, Eskinder; Kumar, Amit

doi:10.1016/j.algal.2020.101815

Cited by 22 publications

(11 citation statements)

References 87 publications

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“…Generally, an energy production process is considered to be profitable only if the value of NER is greater than 1.0 [88,89]. The biomass NER and biofuel NER results of present studies are in Figures 8 and 9, respectively [21,22,39,50,54,85,87,90,91]. The biomass NER values differ between 0.2 and 8.34, and the biofuel NER values vary between 0.07 and 3.05.…”

Section: The Energy Consumption Ratio Of Cultivationmentioning

confidence: 62%

“…Like centrifugation, concentrations are different as obtained by different filtration methods, resulting in different energy consumption. The energy consumption ratio is 0.003-0.018 when bio-feedstock cultivated in column PBR and an open pond system is filtrated by ultra/micro filtration [87]. The energy consumption for the filtration of culture from the open pond system is 0.002-0.003 when pre-concentrated by settling [54].…”

Section: The Energy Consumption Ratio Of Harvestingmentioning

confidence: 99%

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A Review of Energy Consumption in the Acquisition of Bio-Feedstock for Microalgae Biofuel Production

Chen

Zhang

2021

Sustainability

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Microalgae biofuel is expected to be an ideal alternative to fossil fuels to mitigate the effects of climate change and the energy crisis. However, the production process of microalgae biofuel is sometimes considered to be energy intensive and uneconomical, which limits its large-scale production. Several cultivation systems are used to acquire feedstock for microalgal biofuels production. The energy consumption of different cultivation systems is different, and the concentration of culture medium (microalgae cells contained in the unit volume of medium) and other properties of microalgae vary with the culture methods, which affects the energy consumption of subsequent processes. This review compared the energy consumption of different cultivation systems, including the open pond system, four types of closed photobioreactor (PBR) systems, and the hybrid cultivation system, and the energy consumption of the subsequent harvesting process. The biomass concentration and areal biomass production of every cultivation system were also analyzed. The results show that the flat-panel PBRs and the column PBRs are both preferred for large-scale biofuel production for high biomass productivity.

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Section: The Energy Consumption Ratio Of Cultivationmentioning

confidence: 62%

Section: The Energy Consumption Ratio Of Harvestingmentioning

confidence: 99%

A Review of Energy Consumption in the Acquisition of Bio-Feedstock for Microalgae Biofuel Production

Chen

Zhang

2021

Sustainability

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“…The attractivity of this topic comes from interesting new applications for which photoreactors are efficient. For instance, photobioreactors were efficiently developed for microalgae growth in the field of biofuels productions [1][2][3]. Alongside photochemistry, water treatment by photocatalysis was widely investigated, leading to an abundant literature on designing photoreactors for such processes [4,5,6].…”

Section: *Manuscript Click Here To View Linked Referencesmentioning

confidence: 99%

Experimental and theoretical coupled approaches for the analysis of radiative transfer in photoreactors containing particulate media: Case study of TiO2 powders for photocatalytic reactions

Ribeiro

Plantard

Cornet

et al. 2021

Chemical Engineering Science

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“…SCWG precludes an energyintensive drying step, which reduces GHG emissions, thereby making the technology environmentally sustainable. [18] Moreover, SCWG is applicable for various renewable wet feedstocks, from simple model biomass compounds to intricate biomass feedstocks, and is known to produce a fuel-rich gas mixture of hydrogen, methane, and carbon monoxide [28] with low yields of tar or char. [29] Hydrothermal gasification produces a clean syngas during algal energy conversion that is devoid of heteroatoms and metals, as opposed to the char produced from HTC and bio-oil from HTL.…”

Section: Hydrothermal Processing 21 | Hydrothermal Gasificationmentioning

confidence: 99%

“…On the other hand, hydrothermal processing, also a thermochemical conversion pathway, allows complete mineralization of algae and offers a sustainable approach for cultivating and using algae to produce energy. [14,18] Hydrothermal processing also offers flexibility in its final products, which include solids (char) from hydrothermal carbonization (HTC), [19] liquids from hydrothermal liquefaction (HTL), [8] or gaseous fuels from hydrothermal gasification. [5,8] This study focuses on developing a plant layout for gasification in supercritical water for hydrogen production from renewable algal feedstock.…”

Section: Introductionmentioning

confidence: 99%

A parametric study through the modelling of hydrothermal gasification for hydrogen production from algal biomass

2021

Self Cite

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Hydrothermal gasification (HTG) is applicable to high moisture content biomass feedstock such as wet microalgae. The key interests of this thermochemical processing are its ability to use whole algae instead of simply lipid extracts and to use a wide range of algal feedstocks. It employs water in the form of a reaction medium to disintegrate biomass into hydrogen gas. The products' composition and yields are a function of process parameters, namely feed concentration, pressure, and temperature. There is very limited literature available on model development to understand the impacts of various input parameters on the products of HTG. This study presents development of a detailed process model for HTG and the illustration of process parameters on the gas product yields. The approach includes developing the system model, identifying the key process parameters in the reactor setup that affect syngas yield, and understanding the overall process in terms of final product yield. A simulation of hydrothermal gasification based on thermodynamic equilibrium is studied. Based on the developed process model about 52.1 t/day of hydrogen can be produced from 500 t/day of wet algal biomass. This shows the potential of large-scale hydrogen production through this process for hydrogen economy.The results from this study could be used by the gas processing industry and policymakers to determine the most feasible means of converting biomassbased resources into gaseous fuels.

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Environmental performances of diluents and hydrogen production pathways from microalgae in cold climates: Open raceway ponds and photobioreactors coupled with thermochemical conversion

Cited by 22 publications

References 87 publications

A Review of Energy Consumption in the Acquisition of Bio-Feedstock for Microalgae Biofuel Production

A Review of Energy Consumption in the Acquisition of Bio-Feedstock for Microalgae Biofuel Production

Experimental and theoretical coupled approaches for the analysis of radiative transfer in photoreactors containing particulate media: Case study of TiO2 powders for photocatalytic reactions

A parametric study through the modelling of hydrothermal gasification for hydrogen production from algal biomass

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