Effects of various LED light wavelengths and intensities on microalgae-based simultaneous biogas upgrading and digestate nutrient reduction process

Zhao, Yongjun; Wang, Juan; Zhang, Hui; Chen, Yan; Zhang, Yuejin

doi:10.1016/j.biortech.2013.03.051

Cited by 130 publications

(61 citation statements)

References 26 publications

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“…Adequate illumination is an essential factor for microalgae growth [20]. The obtained results are in agreement with those of Zhao et al [9] who have reported that the microalgae Chlorella sp. growth was low under insufficient or excessive light intensities.…”

Section: Effect Of Led Light Wavelength and Intensitysupporting

confidence: 92%

“…In terms of energy consumption, LED is known as economical source of light to satisfy the required energy for the photosynthesis [8]. Microalgae required optimum illumination conditions to achieve economically maximum photosynthetic rates [9]. Ammonia, urea and nitrates are often selected as the nitrogen source for mass cultivation of microalgae [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Influence of nutrients and LED light intensities on biomass production of microalgae Chlorella vulgaris

Khalili

Najafpour

Amini

et al. 2015

Biotechnol Bioproc E

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Microalgae are viable sources of biological compounds for biodiesel production. In this study, effects of various types of nitrogen sources and nutrients concentrations in the growth medium and different LED light wavelengths and intensities on biomass production of green algae Chlorella vulgaris were investigated. Warm white light with 80 µmol/m 2 /sec light intensity was determined as the optimal light for biomass production. The results indicated that microalgae growth with urea as nitrogen source was higher than that of other nitrogen sources such as sodium nitrate, ammonium carbonate and ammonium chloride. Maximum biomass concentration (1.37 g/L) was obtained under the following media compositions: urea 0.25 g/L, K 2 HPO 4 0.04 g/L, MgSO 4 · 7H 2 O 0.06 g/L, and ammonium ferric citrate 0.01 g/L. Microalgae growth data under the different light wavelengths and intensities were fitted with a mathematical model.

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Section: Effect Of Led Light Wavelength and Intensitysupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Influence of nutrients and LED light intensities on biomass production of microalgae Chlorella vulgaris

Khalili

Najafpour

Amini

et al. 2015

Biotechnol Bioproc E

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show abstract

“…energy produced from the biomass produced during algal growth. Both biodiesel (Sivakumar et al 2012;Rawat et al 2013) and biogas (Passos et al 2013;Zhao et al 2013;Olsson et al 2014) have been successfully produced from algae grown in wastewater.…”

Section: Introductionmentioning

confidence: 99%

Effect of lake water on algal biomass and microbial community structure in municipal wastewater-based lab-scale photobioreactors

Krustok

Truu

Odlare

et al. 2015

Appl Microbiol Biotechnol

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Photobioreactors are a novel environmental technology that can produce biofuels with the simultaneous removal of nutrients and pollutants from wastewaters. The aim of this study was to evaluate the effect of lake water inoculation on the production of algal biomass and phylogenetic and functional structure of the algal and bacterial communities in municipal wastewater-treating lab-scale photobioreactors. Inoculating the reactors with lake water had a significant benefit to the overall algal biomass growth and nutrient reduction in the reactors with wastewater and lake water (ratio 70/30 v/v). The metagenome-based survey showed that the most abundant algal phylum in these reactors was Chlorophyta with Scenedesmus being the most prominent genus. The most abundant bacterial phyla were Proteobacteria and Bacteroidetes with most dominant families being Sphingobacteriaceae, Cytophagaceae, Flavobacteriaceae, Comamonadaceae, Planctomycetaceae, Nocardiaceae and Nostocaceae. These photobioreactors were also effective in reducing the overall amount of pathogens in wastewater compared to reactors with wastewater/tap water mixture. Functional analysis of the photobioreactor metagenomes revealed an increase in relative abundance genes related to photosynthesis, synthesis of vitamins important for auxotrophic algae and decrease in virulence and nitrogen metabolism subsystems in lake water reactors. The results of the study indicate that adding lake water to the wastewater-based photobioreactor leads to an altered bacterial community phylogenetic and functional structure that could be linked to higher algal biomass production, as well as to enhanced nutrient and pathogen reduction in these reactors.

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“…Secondly, the spectral energy distribution of light has significant effects on cell physiology and development of microalgae, which could result in competitive advantages for certain strains and hence a domination of strains in the indoor experiment which would not dominate in outdoor cultivation. Another possible result of the use of light sources with a spectral energy distribution differing significantly from sunlight is influence on cultivation parameters such as growth rate, leading to flawed determination of these parameters [122,[136][137][138][139][140][141].…”

Section: Realistic Indoor Reproduction Of Outdoor Light Temperature mentioning

confidence: 99%

Engineering solutions for open microalgae mass cultivation and realistic indoor simulation of outdoor environments

Apel

Weuster‐Botz

2015

Bioprocess Biosyst Eng

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Microalgae could become an important renewable source for chemicals, food, and energy if process costs can be reduced. In the past 60 years, relevant factors in open outdoor mass cultivation of microalgae were identified and elaborate solutions regarding bioprocesses and bioreactors were developed. An overview of these solutions is presented. Since the cost of most microalgal products from current mass cultivation systems is still prohibitively high, further development is required. The application of complex computational techniques for cost-effective process and reactor development will become more important if experimental validation of simulation results can easily be achieved. Due to difficulties inherent to outdoor experimentation, it can be useful to conduct validation experiments indoors. Considerations and approaches for realistic indoor reproduction of the most important environmental conditions in microalgae cultivation experiments-light, temperature, and substance concentrations, are discussed.

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Effects of various LED light wavelengths and intensities on microalgae-based simultaneous biogas upgrading and digestate nutrient reduction process

Cited by 130 publications

References 26 publications

Influence of nutrients and LED light intensities on biomass production of microalgae Chlorella vulgaris

Influence of nutrients and LED light intensities on biomass production of microalgae Chlorella vulgaris

Effect of lake water on algal biomass and microbial community structure in municipal wastewater-based lab-scale photobioreactors

Engineering solutions for open microalgae mass cultivation and realistic indoor simulation of outdoor environments

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