Dynamic modelling of high biomass density cultivation and biohydrogen production in different scales of flat plate photobioreactors

Zhang, Dongda; Dechatiwongse, Pongsathorn; Rio‐Chanona, Ehecatl Antonio del; Maitland, Geoffrey C.; Hellgardt, Klaus; Vassiliadis, Vassilios S.

doi:10.1002/bit.25661

Cited by 30 publications

(16 citation statements)

References 41 publications

(53 reference statements)

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“…Although previous research demonstrated that bubble scattering may play an important role causing light attenuation in a low biomass concentration culture [32], [50], its zero value calculated through the current parameter estimation procedure indicates that its effect on light attenuation is negligible compared to that of cell absorption in the current study. This conclusion is also consistent with recent studies which found that light attenuation is predominantly led by cell absorption instead of bubble scattering for cyanobacterial biohydrogen and C-phycocyanin production [37], [51].…”

Section: Parameters In H Pluvialis Zy-18 Modelssupporting

confidence: 93%

Dynamic modelling of Haematococcus pluvialis photoinduction for astaxanthin production in both attached and suspended photobioreactors

et al. 2016

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Haematococcus pluvialis is a green algae with the great potential to generate natural astaxanthin. In the current study, dynamic models have been proposed to simulate effects of light intensity, light attenuation, temperature and nitrogen quota on cell growth and astaxanthin production in both suspended and attached photobioreactors, which to the best of our knowledge has not been addressed before. Based on the current models, optimal temperatures for algal growth and astaxanthin accumulation are identified. Cell absorption is found to be the primary factor causing light attenuation in the suspended reactor. In this reactor, astaxanthin accumulation is limited by the low local light intensity due to light attenuation during the initial operation period, but almost independent from that once it is close to the maximum value. Compared to the suspended reactor, light attenuation in the attached reactor is much reduced and biomass growth is remarkably enhanced, which suggests the attached reactor is a better choice if the process aims for biomass cultivation. However, the well-mixed culture in the suspended reactor can push most cells toward astaxanthin production; while the attached reactor has the potential to prevent the accumulation of astaxanthin in the bottom algae. Therefore, the suspended photobioreactor should be selected if the process target is astaxanthin production.

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Section: Parameters In H Pluvialis Zy-18 Modelssupporting

confidence: 93%

Dynamic modelling of Haematococcus pluvialis photoinduction for astaxanthin production in both attached and suspended photobioreactors

et al. 2016

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“…Along with open photobioreactors (Apel and Weuster-Botz, 2015), many different closed reactor types with a diversity of reactor geometries and characteristics are proposed for microalgae cultivation (Borowitzka, 1999;Lee, 2001;Tang et al, 2012;Ugwu et al, 2008). Thus, bioreactors such as bubble column reactors (B echet et al, 2013), flat-plate bioreactors (Zhang et al, 2015), or tubular reactors (Camacho Rubio et al, 1999;Huang and Rorrer, 2002;Rorrer and Mullikin, 1999) have been explored. Furthermore, novel photobioreactor configurations such as an oscillatory baffled reactor (Abbott et al, 2015) or a Taylor vortex reactor (Kong et al, 2013) were recently developed for an improved microalgal biomass production.…”

Section: Introductionmentioning

confidence: 99%

Model‐supported phototrophic growth studies with Scenedesmus obtusiusculus in a flat‐plate photobioreactor

Koller

Löwe

Schmid

et al. 2016

Biotech & Bioengineering

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Light-dependent growth of microalgae can vary remarkably depending on the cultivation system and microalgal strain. Cell size and the pigmentation of each strain, as well as reactor geometry have a great impact on absorption and scattering behavior within a photobioreactor. In this study, the light-dependent, cell-specific growth kinetics of a novel green algae isolate, Scenedesmus obtusiusculus, was studied in a LED-illuminated flat-plate photobioreactor on a lab-scale (1.8 L, 0.09 m ). First, pH-controlled batch processes were performed with S. obtusiusculus at different constant incident photon flux densities. The best performance was achieved by illuminating S. obtusiusculus with 1400 μmol photons m s at the surface of the flat-plate photobioreactor, resulting in the highest biomass concentration (4.95 ± 0.16 g L within 3.5 d) and the highest specific growth rate (0.22 h ). The experimental data were used to identify the kinetic parameters of different growth models considering light inhibition for S. obtusiusculus. Light attenuation within the flat-plate photobioreactor was considered by varying light transfer models. Based on the identified kinetic growth model of S. obtusiusculus, an optimum growth rate of 0.22 h was estimated at a mean integral photon flux density of 1072 μmol photons m s with the Beer-Lambert law and 1590 μmol photons m s with Schuster's light transfer model in the flat-plate photobioreactor. LED illumination was, thus, increased to keep the identified optimum mean integral photon flux density constant in the batch process assuming Schuster's light transfer model. Compared to the same constant incident photon flux density (1590 μmol photons m s ), biomass concentration was up to 24% higher using the lighting profile until a dry cell mass concentration of 14.4 ± 1.4 g L was reached. Afterward, the biomass concentration remained constant, whereas cell growth continued in the batch process with constant incident photon flux density. Finally, biomass concentration was 15.5 ± 1.5 g L and, thus, 7% higher compared to the corresponding batch process with lighting profile. Biotechnol. Bioeng. 2017;114: 308-320. © 2016 Wiley Periodicals, Inc.

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“…The carbon uptake rate of cyanobacterial fermentations is generally high during the initial growth rate, but decreases at steady state when biomass concentrations of approx. 3 g CDW /l are reached ( Zhang et al, 2015 ). The decrease in carbon uptake is probably caused by shadow-casting of cells at higher biomass concentrations resulting in photon-limited growth.…”

Section: Discussionmentioning

confidence: 99%

CO2 to succinic acid – Estimating the potential of biocatalytic routes

Liebal

Blank

Ebert

2018

Metabolic Engineering Communications

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Microbial carbon dioxide assimilation and conversion to chemical platform molecules has the potential to be developed as economic, sustainable processes. The carbon dioxide assimilation can proceed by a variety of natural pathways and recently even synthetic CO2 fixation routes have been designed. Early assessment of the performance of the different carbon fixation alternatives within biotechnological processes is desirable to evaluate their potential. Here we applied stoichiometric metabolic modeling based on physiological and process data to evaluate different process variants for the conversion of C1 carbon compounds to the industrial relevant platform chemical succinic acid. We computationally analyzed the performance of cyanobacteria, acetogens, methylotrophs, and synthetic CO2 fixation pathways in Saccharomyces cerevisiae in terms of production rates, product yields, and the optimization potential. This analysis provided insight into the economic feasibility and allowed to estimate the future industrial applicability by estimating overall production costs. With reported, or estimated data of engineered or wild type strains, none of the simulated microbial succinate production processes showed a performance allowing competitive production. The main limiting factors were identified as gas and photon transfer and metabolic activities whereas metabolic network structure was not restricting. In simulations with optimized parameters most process alternatives reached economically interesting values, hence, represent promising alternatives to sugar-based fermentations.

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Dynamic modelling of high biomass density cultivation and biohydrogen production in different scales of flat plate photobioreactors

Cited by 30 publications

References 41 publications

Dynamic modelling of Haematococcus pluvialis photoinduction for astaxanthin production in both attached and suspended photobioreactors

Dynamic modelling of Haematococcus pluvialis photoinduction for astaxanthin production in both attached and suspended photobioreactors

Model‐supported phototrophic growth studies with Scenedesmus obtusiusculus in a flat‐plate photobioreactor

CO2 to succinic acid – Estimating the potential of biocatalytic routes

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