Evolution, detrimental effects, and removal of oxygen in microalga cultures: A review

Peng, Licheng; Lan, Christopher Q.; Zhang, Zisheng

doi:10.1002/ep.11841

Cited by 58 publications

(28 citation statements)

References 59 publications

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“…These values are comparable with horizontal tubular PBR, which was reported as from 3.6 to 10.8 h −1 (Peng et al 2013). However, with still the same rocking cycle of 1 s, k L a in 7.5 cm culture was only 1.04 h…”

Section: Discussionsupporting

confidence: 88%

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Plastic bag as horizontal photobioreactor on rocking platform driven by water power for culture of alkalihalophilic cyanobacterium

Zhu

Cheng

et al. 2017

Bioresour. Bioprocess.

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Background: Mixing in traditional algae culture system consumes intensive electricity. This should be replaced by nature force to reduce energy cost and, more importantly, to realize positive energy balance of algal biofuel production. This study aims to develop a horizontal photobioreactor, in which mixing can be provided with rocking movement driven by nature force.Results: Simple boxes were used as small-scale horizontal photobioreactors on a rocking platform for culture of alkalihalophilic Euhalothece sp. ZM001. There was no CO 2 gas bubbling since 1.0 M NaHCO 3 supplied sufficient inorganic carbon in it. Effect of culture depth, rocking cycle, and light intensity to algal biomass production, pH change, and DO accumulation were investigated in this system. Biomass concentration of 2.73 g/L was achieved in culture with 2.5 cm depth, and maximum productivity of 17.06 g/m 2 /day was obtained in culture with 10 cm depth. k L a in PBR with different culture depths and rocking cycles was measured, and it was from 0.57 to 33.49 h −1, showing great variation. To test this system at large scale, a plastic bag with a surface area of 1 m 2 was placed on a rocking platform driven by water power, and it resulted in a biomass concentration of 1.88 g/L. Conclusion: These results proved feasibility of a novel photobioreactor system driven by nature force, as well as low cost of manufacturing, and easy scaling-up.

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Section: Discussionsupporting

confidence: 88%

“…The problem for oxygen, however, is still to be studied, since it may cause photo-inhibition when accumulated to high level (Peng et al 2013). In this study, there was great variation on (Peng et al 2013).…”

Section: Discussionmentioning

confidence: 74%

Plastic bag as horizontal photobioreactor on rocking platform driven by water power for culture of alkalihalophilic cyanobacterium

Zhu

Cheng

et al. 2017

Bioresour. Bioprocess.

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“…Controlling contamination from biological agents such as microalga‐predator protozoa is a major contributor to the high costs of microalgal cultivation, especially for freshwater microalgae, as it demands intensive energy consumption for medium and system sterilization and requires costly closed systems and cautious procedures for maintaining sterility . Furthermore, deoxygenation, which is required for mitigation of oxygen stress to microalgal cells, is vastly more complicated and costly in the closed systems that are required for sterile cultivation of microalgae.…”

Section: Introductionmentioning

confidence: 99%

Cultivation of freshwater green alga Neochloris oleoabundans in non‐sterile media co‐inoculated with protozoa

2016

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The effects of sodium bicarbonate on freshwater green alga Neochloris oleoabundans were evaluated with respect to cell growth, cell morphology, and control of protozoa contamination under non-sterile conditions co-inoculated with protozoa pre-cultures. While culture collapse occurred in the control and the cultures containing 40 mmol/L NaHCO 3 due to protozoa contamination, the addition of 160 or 200 mmol/L NaHCO 3 could completely inhibit the growth of microalgae-preying protozoa and allow safe cultivation of N. oleoabundans for co-incubation with protozoa in non-sterile media. These results suggest that well-formulated media containing appropriate amounts of dissolved inorganic carbon (DIC) may enable low-cost cultivation of freshwater microalgae in non-sterile open systems.

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“…A significant problem arises during the operation of closed photobioreactors when the microalgal culture reaches toxic oxygen concentrations. Weissman et al (1988) reported toxic oxygen concentrations as high as 100 mg L −1 for a tubular photobioreactor, although Peng et al (2013) reported that inhibition depends on the microalgal strains or population, so oxygen concentrations could range from 8.0 to 53 mg L −1 . If an adequate control of the dissolved oxygen concentration is implemented (i.e., stripping out), it would avoid reaching toxic concentrations.…”

Section: Introductionmentioning

confidence: 96%

Short-term evaluation of the photosynthetic activity of an alkaliphilic microalgae consortium in a novel tubular closed photobioreactor

et al. 2015

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A novel lab-scale tubular closed photobioreactor was developed and used for the assessment of the photosynthetic activity of an alkaliphilic microalgae mixed consortium under non-substrate limitation (i.e., bicarbonate excess), controlled irradiance, and mixing conditions. Two prominent haloalkaliphilic strains were identified as members of the consortium: Halospirulina sp. and Picochlorum sp. The photobioreactor (vol=0.5 L) consists of two interconnected U-shaped borosilicate glass tubes (internal diameter 2 cm) reaching a surface/volume ratio of 200 m 2 m −3 . This configuration specifically addressed the issue of the homogeneous light distribution among the microalgae suspended cells cultured by using fixed equidistant cool white light LEDs nearby the surface of the glass tubes. A soft homogeneous pneumatic mixing (i.e., airlift) was implemented in the culture fostering Reynolds numbers around 3000. The photosynthetic activity of the microalgae consortium was evaluated during different short-term kinetic assays by fitting the dynamics of the dissolved oxygen concentration to an oxygenic kinetic model. The photobioreactor operated in a closed loop allowed to control the produced oxygen by the extraction of the cumulated gas in the headspace. The use of this novel photobioreactor allowed the photosynthetic activity of microalgae suspended cells to be assessed, where the dissolved oxygen concentration and irradiance were the main parameters affecting the oxygenic rates under alkaline pH.

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Evolution, detrimental effects, and removal of oxygen in microalga cultures: A review

Cited by 58 publications

References 59 publications

Plastic bag as horizontal photobioreactor on rocking platform driven by water power for culture of alkalihalophilic cyanobacterium

Plastic bag as horizontal photobioreactor on rocking platform driven by water power for culture of alkalihalophilic cyanobacterium

Cultivation of freshwater green alga Neochloris oleoabundans in non‐sterile media co‐inoculated with protozoa

Short-term evaluation of the photosynthetic activity of an alkaliphilic microalgae consortium in a novel tubular closed photobioreactor

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