Effect of light intensity and wavelength on nitrogen and phosphate removal from municipal wastewater by microalgae under semi-batch cultivation

Bahman, Mahsa; Aghanoori, Marjan; Jalili, Hasan; Bozorg, Ali; Danaee, Soroosh; Bidhendi, Mehdi Esmaeili; Amrane, Abdeltif

doi:10.1080/09593330.2020.1829087

Cited by 22 publications

(10 citation statements)

References 23 publications

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“…In contrast to these results, Chainapong et al reported a higher growth rate of AP under white light in comparison to blue, red and yellow lights, while Ravelonandro found that the final biomass of AP exposed to green or white light was higher compared to red light [ 38 , 55 ]. In complete contrast to our results, in two studies the highest growth rate was found under blue light; Madhyastha observed the greatest growth in A. fusiformis in blue light and the least in red light [ 36 ], and Bahman et al reported that—also for AP—the highest biomasses were observed under blue light [ 56 ]. These varying findings might result from differences in the microalgal strains (slight differences are reported even among AP strains), experimental setup and realization of the studies [ 51 ].…”

Section: Discussioncontrasting

confidence: 99%

Influence of Different Light-Emitting Diode Colors on Growth and Phycobiliprotein Generation of Arthrospira platensis

Jung¹,

Waldeck

Sykora

et al. 2022

Life

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Light-emitting diodes (LED) can be utilized as tailorable artificial light sources for the cultivation of cyanobacteria such as Arthrospira platensis (AP). To study the influence of different LED light colors on phototrophic growth and biomass composition, AP was cultured in closed bioreactors and exposed to red, green, blue, or white LED lights. The illumination with red LED light resulted in the highest cell growth and highest cell densities compared to all other light sources (order of cell densities: red > white > green > blue LED light). In contrast, the highest phycocyanin concentrations were found when AP was cultured under blue LED light (e.g., order of concentrations: blue > white > red > green LED light). LED-blue light stimulated the accumulation of nitrogen compounds in the form of phycobiliproteins at the expense of cell growth. The results of the study revealed that exposure to different LED light colors can improve the quality and quantity of the biomass gained in AP cultures.

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Section: Discussioncontrasting

confidence: 99%

Influence of Different Light-Emitting Diode Colors on Growth and Phycobiliprotein Generation of Arthrospira platensis

Jung¹,

Waldeck

Sykora

et al. 2022

Life

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“…The Chl-a and Car contents were calculated according to the following equations: Chl-a (mg/L) = 16.72 × OD 665.2 − 9.16 × OD 652. 4 (2)…”

Section: Methodsmentioning

confidence: 99%

“…Coupling wastewater treatment with microalgae cultivation is an advanced strategy for wastewater recycling that can reduce microalgae cultivation costs and remove N and P pollutants. Many studies have confirmed that microalgae can grow in different wastewaters, such as municipal wastewater [4], olive mill wastewater [5], soy sauce wastewater [6], and agro-industrial wastewater [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Caprolactam Wastewater on Algal Growth and Nutrients Removal by Arthrospira platensis

Wang

et al. 2021

Applied Sciences

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Caprolactam wastewater (WCP), which is generated during the production of caprolactam, contains high contents of NO3− and inorganic P and is considered to be difficult to treat. In this study, Arthrospira platensis was used to remove N and P from WCP. Culture conditions and wastewater addition were optimized to relieve the inhibition effects of WCP. The results show that A. platensis growth and photosynthetic activity were inhibited depending on WCP concentrations. The inhibition rates were enhanced as the culture time increased under batch mode. However, the fed-batch mode significantly minimized the negative impact on A. platensis, which is beneficial for removing N and P from WCP by Arthrospira. After 10 d of cultivation of A. platensis in a 25 L circular photobioreactor in fed-batch addition of WCP (1.25% mixed WCP (v/v) each day), the average biomass productivity reached 17.48 g/(m2·d), the maximum protein content was 69.93%, and the N and P removal ratios were 100%. The accumulation effect of WCP inhibition on algal growth was not observed under this culture condition. Fed-batch cultivation of A. platensis is a promising way for bioremediation of WCP with high N and P removal efficiencies and high value-added biomass production.

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“…To evaluate the photoautotrophic growth and activity of N. salina, a range of LED panel lights including white (380-760 nm), red (670-680 nm), blue (420-430 nm), and a mixture of red and blue lights (purple) were used at 4800 lux (124 μmol m À2 s À1 ). 23 To ensure that ambient lighting did not interfere with the experiments, the bioreactor was stored in a dark room fitted with LED light sources, allowing microalgae incubation under the desired illumination conditions. Light intensity was measured using a Lux Meter (Model MS6610, V&A Instruments, China).…”

Section: Light Sourcementioning

confidence: 99%

“…18,20,21 It has been shown that the highest light absorption of chlorophyll-a is in the ranges of 630 nm to 680 nm (red light) and 400-480 nm (blue light). [21][22][23][24] By effectively converting the electrical energy into light energy, 24 the light-emitting diodes (LEDs) would be able to not only supply photons at desired wavelengths to be effectively adsorbed by microalgae, but also with appropriate intensity to support their phototropic growth. 25 By growing in aqueous solutions of high salinity, marine microalgae N. salina has been used extensively to produce biofuels, 26 pharmaceuticals, 27 and fish feed.…”

mentioning

confidence: 99%

Kinetic models to describe Nannochloropsis salina cultivation under different illumination conditions

Shirazian

Azin

Bozorg

2022

Env Prog and Sustain Energy

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Nannochloropsis salina (N. salina) has recently received growing interests as a sustainable source of high‐value bioproducts. As the illumination condition could be manipulated to affect the microalgae activities in indoor cultivation, in this study, kinetic models were developed to describe the growth and bioproduct formation in N. salina under different illumination conditions. Being continuously exposed to white (380–760 nm), blue (430 nm), red (680 nm), and mixed blue/red light, the growth of N. salina was assessed over the course of 12 days incubation and the evolving cell densities, lipid, and carbohydrate concentrations were recorded. Kinetic models were then used to fit the experimental results and describe microalgae behaviors with respect to illumination conditions. The highest growth rates were recorded when the microalgae were exposed to the blue/red light, leading to 0.8 g/L standing dry biomass. Also, although lipid and carbohydrate productions were stimulated under other illumination conditions, the advanced biomass production achieved by blue/red light resulted in the highest lipid and carbohydrate productions. As confirmed by the kinetic models, the results obtained in this study revealed that the light absorbed by the photosynthetic pigments of N. salina could be manipulated to not only control the microalgae growth, but also its biological activities, including carbohydrate and lipid productions. Therefore, a two‐stage process would be recommended for lipid and carbohydrate production by N. salina.

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Effect of light intensity and wavelength on nitrogen and phosphate removal from municipal wastewater by microalgae under semi-batch cultivation

Cited by 22 publications

References 23 publications

Influence of Different Light-Emitting Diode Colors on Growth and Phycobiliprotein Generation of Arthrospira platensis

Influence of Different Light-Emitting Diode Colors on Growth and Phycobiliprotein Generation of Arthrospira platensis

Effects of Caprolactam Wastewater on Algal Growth and Nutrients Removal by Arthrospira platensis

Kinetic models to describe Nannochloropsis salina cultivation under different illumination conditions

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