Microalgal photoautotrophic growth induces pH decrease in the aquatic environment by acidic metabolites secretion

Wu, Mingcan; Wu, Guimei; Lu, Feimiao; Wang, Hongxia; Lei, Anping; Wang, Jiangxin

doi:10.1186/s13068-022-02212-z

Cited by 10 publications

(7 citation statements)

References 50 publications

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“…The significant surge in TIC levels and the corresponding pH shift in strain MAS3 could be indicative of its more efficient heterotrophic metabolism compared to that in strain MAS1. However, Wu et al 46 observed a decrease in pH upon microalgal photoautotrophic growth in the aquatic environment due to the secretion of acidic metabolites. Other studies also indicated that the TOC-to-TN ratio can influence the nutrient removal process, particularly during microalgal wastewater treatment.…”

Section: Adaptability and Efficiency Of Acid-tolerant Microalgae In H...mentioning

confidence: 99%

Harnessing Extremophilic Trait and Metabolic Flexibility of Microalgal Strains for the Treatment of Highly Alkaline Winery Wastewater

Praveen,

Abinandan,

Venkateswarlu

et al. 2023

ACS EST Eng.

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Microalgae possess traits that make them thrive under extreme environmental conditions, and this fascinating adaptability recognizes them as novel candidates for wastewater treatment and bioresource management. In this study, we assessed two extremophilic (acid-tolerant) microalgal strains, Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3, for their ability to thrive in high-alkaline environments as existing in winery wastewater. These strains showed a rapid growth rate (1.10−1.30 d −1 ), a substantial increase in chlorophyll, and efficient removal of carbon (70−80%) as well as nitrogen and phosphate (80−90%) during mixotrophic cultivation in highly alkaline winery wastewater. Metabolic analysis unveiled the interplay among CO 2 fixation, nitrogen assimilation, amino acid metabolism, and other key pathways, highlighting the ability of the microalgal strains to change their metabolic processes in response to extreme-pH conditions. Especially noteworthy is the elevated expression of organic acids in strain MAS1, suggesting their vital role in nutrient uptake in the alkaline environment. Harnessing these extremophilic traits negates the need for wastewater pretreatment and reduces both energy and chemical footprints, aligning with several UN Sustainable Development Goals. Our study thus presents new insights into the extremophilic nature of microalgal strains for remediation, biomass production, and broader biotechnological applications, paving the way for sustainable industrial innovations.

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Section: Adaptability and Efficiency Of Acid-tolerant Microalgae In H...mentioning

confidence: 99%

Harnessing Extremophilic Trait and Metabolic Flexibility of Microalgal Strains for the Treatment of Highly Alkaline Winery Wastewater

Praveen,

Abinandan,

Venkateswarlu

et al. 2023

ACS EST Eng.

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show abstract

“…In contrast with the present study, a pH decrease was reported in photobioreactors with other microalgal species described as hyperproducers of humic acids, such as Euglena sp. [38]. The co-production of other acid compounds such as itaconic acid by these microalgae was responsible for the pH decrease in such photobioreactors [39].…”

Section: Physical-chemical Characteristics Of Uww and Conventional Po...mentioning

confidence: 99%

“…acids, such as Euglena sp. [38]. The co-production of other acid compounds such as itaconic acid by these microalgae was responsible for the pH decrease in such photobioreactors [39].…”

Section: Physical-chemical Characteristics Of Uww and Conventional Po...mentioning

confidence: 99%

Microalgal Systems, a Green Solution for Wastewater Conventional Pollutants Removal, Disinfection, and Reduction of Antibiotic Resistance Genes Prevalence?

et al. 2023

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The low-efficiency rate of urban wastewater (UWW) treatment generates tons of discharged water with a high concentration of pollutants, pathogens and antibiotic-resistance genes (ARGs). Microalgal systems may be a green alternative to be implemented as a UWW polishing treatment. This study assessed the ability of Chlorella vulgaris and UWW autochthonous microalgal species (AMS) to simultaneously remove PO4–P, and reduce the proliferation of coliforms and ARGs. AMS seems to be more promising due to: (i) the higher specific growth rate, μmax (0.687 ± 0.065 d−1); (ii) efficient PO4–P removal (92.62 ± 0.10%); (iii) faster reduction of coliforms proliferation achieving concentrations below the limits of quantification (6 d); (iv) the reduction of intl1 and the ARGs sul1 and blaTEM abundance in ca. of 70.4%, 69.2%, and 75.7%, respectively (9 d); and (v) the additional reduction of these genes in ca. of 97.1%, 94.2%, and 99.9%, respectively, after 5 d storage in the dark and at room temperature. Results also revealed that the high pH values in both microalgal systems (due to microalgal growth) were highly correlated with a reduction in the proliferation of coliforms, including Escherichia coli. In conclusion, using AMS as a final polishing treatment of UWW seems to be very promising.

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“…In the majority of bioreactors, light supply, [ 50–52,81 ] cell concentration, [ 82–84 ] CO 2 concentration, [ 85,86 ] pH, [ 87–91 ] temperature, [ 52,92 ] concentration of nutrients, [ 91 ] and other parameters are affected by and have an impact on the growth of microorganisms. [ 89,91,93–95 ] These systems must be monitored and externally maintained to achieve optimal results [ 85,95 ] which adds to the overall cost.…”

Section: Photobioreactor Design Is Pivotal For High Yield Of Microalgaementioning

confidence: 99%

Recent advances and fundamentals of microalgae cultivation technology

Rozenberg,

Sorokin,

Mukhambetova

et al. 2024

Biotechnology Journal

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Microalgae are considered to be a promising group of organisms for fuel production, waste processing, pharmaceutical applications, and as a source of food components. Unicellular algae are worth being considered because of their capacity to produce comparatively large amounts of lipids, proteins, and vitamins while requiring little room for growth. They can also grow on waste and fix CO2 and nitrogen compounds. However, production costs limit the industrial use of microalgae to the most profitable applications including micronutrient production and fish farming. Therefore, novel microalgae based technologies require an increase of the production efficiencies or values. Here we review the recent studies focused on getting strains with novel characteristics or cultivating techniques that improve production's robustness or efficiency and categorize these findings according to the fundamental factors that determine microalgae growth. Improvements of light and nutrient delivery, as well as other aspects of photobioreactor design, have shown the highest average increase in productivity. Other methods, such as an improvement of phosphorus or CO2 fixation and temperature adaptation have been found to be less effective. Furthermore, interactions with particular bacteria may promote the growth of microalgae, although bacterial and grazer contaminations must be managed to avoid culture failure. The competitiveness of the algal products will increase if these discoveries are applied to industrial settings.

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Microalgal photoautotrophic growth induces pH decrease in the aquatic environment by acidic metabolites secretion

Cited by 10 publications

References 50 publications

Harnessing Extremophilic Trait and Metabolic Flexibility of Microalgal Strains for the Treatment of Highly Alkaline Winery Wastewater

Harnessing Extremophilic Trait and Metabolic Flexibility of Microalgal Strains for the Treatment of Highly Alkaline Winery Wastewater

Microalgal Systems, a Green Solution for Wastewater Conventional Pollutants Removal, Disinfection, and Reduction of Antibiotic Resistance Genes Prevalence?

Recent advances and fundamentals of microalgae cultivation technology

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