Abstract:The present study was aimed to develop a membrane sparger (MS) integrated into a tubular photobioreactor to promote the increase of the carbon dioxide (CO2) fixation by Spirulina sp. LEB 18 cultures. The use of MS for the CO2 supply in Spirulina cultures resulted not only in the increase of DIC concentrations but also in the highest accumulated DIC concentration in the liquid medium (127.4 mg L−1 d−1). The highest values of biomass concentration (1.98 g L−1), biomass productivity (131.8 mg L−1 d−1), carbon in … Show more
“…There are some promising and new substances to adsorb CO 2 from pre-ignition processes, post-ignition processes, and oxyfuel processes. 62 Examples of new substances include ionic liquids (ILs), Metal-Organic Frameworks (MOFs), fibrous and nanofiber membranes and adsorbents (Figure 3). Figure 3.Schematic of new methods to adsorb CO 2 .…”
Section: New Methods To Adsorption and Separation Of Carbon Dioxidementioning
Air pollution as a result of industrialization is a serious problem in many developed and developing countries. Gaseous nitrogen oxides (NOx) and sulfur oxides (SOx) produced primarily due to the coal combustion process and automobiles, cause severe environmental problems such as acid rain, smog, ground level ozone etc. These have far reaching consequences on the ecosystem and in many cases direct toxicology effects on humans. Greenhouse gases such as carbon dioxide (CO2), methane (CH4) are another important class of air pollutants, which are widely regarded to be responsible for the global warming effect. Nanofibers could play an important role as gas sensors for the detection of acceptable emission limits for a variety of gases. Various methods have been proposed for carbon dioxide separation and eventual storage. Ideal materials for carbon dioxide capture and separation must have a porous structure, good strength and stability, and an environmentally friendly manufacturing process. In this regard, electrospun polymer nanofibers are among the ideal materials for carbon dioxide separation. Today, due to the appropriate physical structure and easy and cost-effective manufacturing method, electrospun polymer nanofibers have received more attention from scientists. In recent years, the use of polymer nanofibers has been identified as a high-efficiency method for the separation of gaseous pollutants, including carbon dioxide, from gaseous streams. In this review article, an attempt has been made to investigate the separation of CO2 gas from air using various methods, including the membrane separation method. The recent progress in the design and fabrication of electrospun nanofibers for chemical separation reviews. Also, the different CO2 capture mechanisms including electrostatic, affinity, covalent bonding, chelation, and magnetic adsorption by adsorbents, solvents, and membranes are explained
“…There are some promising and new substances to adsorb CO 2 from pre-ignition processes, post-ignition processes, and oxyfuel processes. 62 Examples of new substances include ionic liquids (ILs), Metal-Organic Frameworks (MOFs), fibrous and nanofiber membranes and adsorbents (Figure 3). Figure 3.Schematic of new methods to adsorb CO 2 .…”
Section: New Methods To Adsorption and Separation Of Carbon Dioxidementioning
Air pollution as a result of industrialization is a serious problem in many developed and developing countries. Gaseous nitrogen oxides (NOx) and sulfur oxides (SOx) produced primarily due to the coal combustion process and automobiles, cause severe environmental problems such as acid rain, smog, ground level ozone etc. These have far reaching consequences on the ecosystem and in many cases direct toxicology effects on humans. Greenhouse gases such as carbon dioxide (CO2), methane (CH4) are another important class of air pollutants, which are widely regarded to be responsible for the global warming effect. Nanofibers could play an important role as gas sensors for the detection of acceptable emission limits for a variety of gases. Various methods have been proposed for carbon dioxide separation and eventual storage. Ideal materials for carbon dioxide capture and separation must have a porous structure, good strength and stability, and an environmentally friendly manufacturing process. In this regard, electrospun polymer nanofibers are among the ideal materials for carbon dioxide separation. Today, due to the appropriate physical structure and easy and cost-effective manufacturing method, electrospun polymer nanofibers have received more attention from scientists. In recent years, the use of polymer nanofibers has been identified as a high-efficiency method for the separation of gaseous pollutants, including carbon dioxide, from gaseous streams. In this review article, an attempt has been made to investigate the separation of CO2 gas from air using various methods, including the membrane separation method. The recent progress in the design and fabrication of electrospun nanofibers for chemical separation reviews. Also, the different CO2 capture mechanisms including electrostatic, affinity, covalent bonding, chelation, and magnetic adsorption by adsorbents, solvents, and membranes are explained
“…Although a solved problem for most heterotrophic bioprocesses, straightforward and scalable methods do not yet exist for determining instantaneous rates of CO 2 uptake in cyanobacterial cultures. Instead, the predominant focus remains on total levels of carbon uptake, as most commonly determined via correlation with cell growth using a biomass composition that is either assumed (e.g., cell dry weight is ∼50% carbon) or measured (via elemental analysis) (Aghaalipour, Güllü, & Akbulut, 2020; Moraes, da Rosa, Santos, & Costa, 2020; Oliver & Atsumi, 2015); a laborious and time-consuming approach that still only produces low-resolution datasets. Alternatively, instantaneous rates of CO 2 uptake by phototrophic cultures have been estimated by measuring rates of O 2 evolution (Benschop, Badger, & Dean Price, 2003; Price, Woodger, Badger, Howitt, & Tucker, 2004); also an indirect method whose results can be obscured by the occurrence of O 2 consumption pathways.…”
Quantification of CO2fixation rates by cyanobacteria is vital to determining their potential as industrial strains in a circular bioeconomy. Currently, however, CO2fixation rates are most often determined through indirect and/or low-resolution methods, resulting in an incomplete picture of both dynamic behaviors and total carbon fixing potential. To address this, we developed a novel, low-cost system forin situoff-gas analysis which supports the automated acquisition of high-resolution and CO2uptake rates from cyanobacterial cultures. Carbon fixation data obtained via this system was independently verified by elemental analysis of cultivated biomass. UsingSynechococcus sp.PCC 7002 andSynechocystis sp.PCC 6803, we demonstrate that phototrophic CO2uptake rates accelerate linearly to a maximum before then decaying monotonically to cessation by stationary phase. Furthermore, consistent with the expected stoichiometry, we found that strong correlations exist between both the rates and total levels of cell growth and carbon fixation. This system simultaneously provides a high-resolution growth curve, accurate carbon fixation rates, as well as the total amount of carbon fixed in a cyanobacterial batch culture, thus illuminating the parameters with which cyanobacterial researchers can exploit use to realize their full potential in industrial applications.
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