Investigation of bio-desalination potential algae and their effect on water quality

Moayedi, Asma; Yargholi, Bahman; Pazira, Ebrahim; Babazadeh, Hossein

doi:10.5004/dwt.2021.26638

Cited by 10 publications

(6 citation statements)

References 43 publications

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“…When analyzing desalination in the initial trial with the highest desalinations occurring in salinity 60‰ (11.67‰ ± 0.58), followed by 83‰ (10.67‰ ± 0.58) and 67/75‰ (9.33‰ ± 0.58), results were positive but still inferior to past studies as reported by Maoyedi et al achieved around 20‰ desalination on a 130mS/cm solution in 2021, in a 5L setup with ligh intensity of 3500 lux at 25°C [27]. Yet this desalination action could not be replicated in the upscaling process.…”

Section: Discussioncontrasting

confidence: 58%

Evaluation of Dunaliella salina Growth in Different Salinities for Potential Application on Saline Wastewater Treatment and Biomass Production

Tanoeiro,

Fehrenbach,

Murray

et al. 2024

Preprint

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This study investigated the adaptability of Dunaliella salina to different salinity levels, with emphasis on growth, pigment concentration, and desalination potential. It was found that among the 21 salinity levels (0-20%), 75‰ salinity produced consistently favorable results in cell count (13.08 x 103 ± 1.41 x 103 cells/mL), dry biomass (2.46 ± 0.06 g/L), pigment content (chlorophyll a = 9.75 ± 0.01 µg/L, chlorophyll b = 12.36 ± 0.03 µg/L), and desalination (9.32 ± 0.47 % reduction). Therefore, 75‰ salinity level was selected for the final trial (scale-up), which revealed unanticipatedly high cell counts (58.96 x 103 ± 535.22 cells/mL), with dry biomass weight being statistically extremely different (higher) than the expected (4.21 ± 0.02 g/L) (p&lt;0.0001), most likely due to high cell count and energy reserve storage for high salinity adaption in the form of bio-compounds. Pigment growth continued (chlorophyll a = 9.54 ± 0.2 µg/L, chlorophyll b = 12.81 ± 0.51 µg/L), indicating pigment production under salt stress. Notably, desalination did not occur in this stage, possibly due to the necessity for a bigger initial inoculate, prolonged exposure or bioaccumulation becoming the prevailing mechanism over desalination. Despite this, the microalgae thrived in high salinity conditions. These findings point to further study into the mechanics of salt build-up within cells, which might lead to successful desalination technologies. Dunaliella salina adaptation to high salinity settings suggests its possible usage in natural pools or soils that are normally inappropriate for traditional production, giving a chance for enterprises to function in rough extreme salinity conditions.

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Section: Discussioncontrasting

confidence: 58%

Evaluation of Dunaliella salina Growth in Different Salinities for Potential Application on Saline Wastewater Treatment and Biomass Production

Tanoeiro,

Fehrenbach,

Murray

et al. 2024

Preprint

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“…When analyzing desalination in the initial trial results were positive but still inferior to past studies which achieved a desalination of 20 on a 130mS/cm solution in 2021, in a 5L setup with ligh intensity of 3500 lux at 25°C [43]. Desalination occurs due to an early influx of Na + through the cell membranes.…”

Section: Discussionmentioning

confidence: 87%

“…D. salina was utilized since it is one of the most investigated halophytes in terms of desalination, although other halophytes may be more suited or even more adapted for the end goal. Such include Chlorella vulgaris, which is also very well reported in bibliography for its desalination properties [12,58].…”

Section: Discussionmentioning

confidence: 87%

Evaluation of Dunaliella salina Growth in Different Salinities for Potential Application on Saline Wastewater Treatment and Biomass Production

Tanoeiro,

Fehrenbach,

Murray

et al. 2024

Preprint

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This study investigated the adaptability of Dunaliella salina to different salinity levels, with emphasis on growth, pigment concentration, and desalination potential. It was found that among the 21 salinity levels, salinity 75 produced consistently favorable results in cell count (13.08 x 103 ± 1.41 x 103 cells/mL), dry biomass (2.46 ± 0.06 g/L), pigment content (chlorophyll a = 97.5 ± 0.1 µg/L, chlorophyll b = 123.6 ± 0.3 µg/L), and desalination (9.32 ± 0.47 reduction). Therefore, salinity 75 was selected for the final trial (scale-up), which revealed unanticipatedly high cell counts (58.96 x 103 ± 535.22 cells/mL), with dry biomass weight being statistically different (higher) than the expected (4.21 ± 0.02 g/L) (p<0.0001), most likely due to high cell count and energy reserve storage for high salinity adaption in the form of bio-compounds. Pigment growth continued (chlorophyll a = 95.4 ± 2.2 µg/L, chlorophyll b = 128.1 ± 5.1 µg/L), indicating pigment production under salt stress. Notably, desalination did not occur in this stage, possibly due to the necessity for a bigger initial inoculate, prolonged exposure or bioaccumulation becoming the prevailing mechanism over desalination. Nevertheless, the trial highlights D. salina's strong adaptation to various salinity levels. This suggests a promising future in halophyte research, particularly in understanding the mechanisms that prevent salt accumulation in cells and how to overcome this barrier. Additionally, these results suggest that microalgae could be a viable resource in saline-rich environments unsuitable for conventional agriculture, promoting industrial adaptation to adverse conditions.

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“…Microalgae constitute a heterogeneous group of photosynthetic organisms that can grow in either saline or freshwater and in different climates [36]. These characteristics have led to their direct use as novel and sustainable biological techniques for seawater desalination [12,[39][40][41][42]. In fact, it has been found that some common genera of freshwater microalgae, many of which have been widely used in wastewater treatment, such as Chlorella, Scenedesmus and Desmodesmus among others, can survive and grow in water with high NaCl levels [6,15,43].…”

Section: The Use Of Microalgae and Cyanobacteria To Desalinate Watermentioning

confidence: 99%

“…A promising application of microalgae is the treatment of produced water (PW), saline wastewater, or the pretreatment of saline water with high nutrient and metal contents [6,41,52].…”

Section: Desalination Experiences With Microalgae and Cyanobacteriamentioning

confidence: 99%

Biological Seawater Desalination

O. Martínez

2024

Environmental Sciences

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More than two billion people worldwide lack access to safe, clean drinking water, and this number is likely to increase due to population growth and rapidly diminishing freshwater supplies. Current seawater desalination methods can effectively provide freshwater and meet the growing demand for this resource. However, they are becoming increasingly controversial owing to their adverse environmental impacts, including high energy consumption and generation of desalination brine. For millions of years, various species of organisms such as plants, microalgae, and bacteria have adapted to environments with variable salinity and have developed mechanisms to eliminate excess intracellular NaCl. This has encouraged scientists to study the possibility of using biological processes for seawater desalination. Biodesalination is an emerging technology for the selective removal of Na + and Cl − from salt water by various halophile organisms, such as macrophytes, microalgae, and cyanobacteria, with very low energy consumption. Microbial desalination cells that allow simultaneous desalination of water in conjunction with wastewater treatment are also included in this category. The direct use of living organisms such as halophile plants, microalgae, and bacteria to desalinate water appears to be a promising field. However, the development and practical applicability of these technologies depend on the living organisms selected for desalinating seawater.

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Investigation of bio-desalination potential algae and their effect on water quality

Cited by 10 publications

References 43 publications

Evaluation of Dunaliella salina Growth in Different Salinities for Potential Application on Saline Wastewater Treatment and Biomass Production

Evaluation of Dunaliella salina Growth in Different Salinities for Potential Application on Saline Wastewater Treatment and Biomass Production

Evaluation of Dunaliella salina Growth in Different Salinities for Potential Application on Saline Wastewater Treatment and Biomass Production

Biological Seawater Desalination

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