Resource recovery from industrial effluents through the cultivation of microalgae: A review

Ali, Shazia Muhammad; Peter, Angela Paul; Chew, Kit Wayne; Munawaroh, Heli Siti Halimatul; Show, Pau Loke

doi:10.1016/j.biortech.2021.125461

Cited by 79 publications

(20 citation statements)

References 94 publications

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“…In particular, they are capable of using wastewater as a source of nutrients for growth and thus can be used for wastewater treatment. Microalgae-based wastewater treatment can reduce the energy use of waste management strategies and regenerate nutrients derived from waste effluents such as nitrogen and phosphorus [ 8 , 9 ]. In addition, microalgae can produce lipids with simultaneous production of other fine valuable bioactive compounds such as proteins and carbohydrates [ 10 , 11 ], thereby offsetting the lipid production cost and enhancing their economic feasibility as a source of biodiesel [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Biochemical and Morphological Changes Triggered by Nitrogen Stress in the Oleaginous Microalga Chlorella vulgaris

et al. 2022

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Oleaginous microalgae have been considered promising sources of biodiesel due to their high lipid content. Nitrogen limitation/starvation is one of the most prominent strategies to induce lipid accumulation in microalgae. Nonetheless, despite numerous studies, the mechanism underlying this approach is not well understood. The aim of this study was to investigate the effect of nitrogen limitation and starvation on biochemical and morphological changes in the microalga Chlorella vulgaris FACHB-1068, thereby obtaining the optimal nitrogen stress strategy for maximizing the lipid productivity of microalgal biomass. The results showed that nitrogen limitation (nitrate concentration < 21.66 mg/L) and starvation enhanced the lipid content but generally decreased the biomass productivity, pigment concentration, and protein content in algal cells. Comparatively, 3-day nitrogen starvation was found to be a more suitable strategy to produce lipid-rich biomass. It resulted in an increased biomass production and satisfactory lipid content of 266 mg/L and 31.33%, respectively. Besides, nitrogen starvation caused significant changes in cell morphology, with an increase in numbers and total size of lipid droplets and starch granules. Under nitrogen starvation, saturated fatty acids (C-16:0, C-20:0, and C-18:0) accounted for the majority of the total fatty acids (~80%), making C. vulgaris FACHB-1068 a potential feedstock for biodiesel production. Our work may contribute to a better understanding of the biochemical and morphological changes in microalgae under nitrogen stress. Besides, our work may provide valuable information on increasing the lipid productivity of oleaginous microalgae by regulating nitrogen supply.

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Section: Introductionmentioning

confidence: 99%

Biochemical and Morphological Changes Triggered by Nitrogen Stress in the Oleaginous Microalga Chlorella vulgaris

et al. 2022

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“…Among the nutrients, nitrogen, carbon and the phosphate compounds are essential for building the cell structure and cell proliferation. Nitrogen is utilized for the production of chlorophyll, amino acids and cell growth 44 . Its depletion is the most investigated parameter for excessive lipid accumulation 45,46 .…”

Section: Resultsmentioning

confidence: 99%

“…Nitrogen is utilized for the production of chlorophyll, amino acids and cell growth. 44 Its depletion is the most investigated parameter for excessive lipid accumulation. 45,46 An organic carbon source as substrate is necessary to produce energy which is used for microalgal growth under heterotrophic conditions.…”

Section: Effects Of Nutrient Concentrations On Microalgal Growthmentioning

confidence: 99%

Monitoring microalgal growth of Chlorella minutissima with a new all solid‐state contact nitrate selective sensor

Balkanli

Işıldak

İnan

et al. 2022

Biotechnology Progress

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As third generation feedstock, microalgae are microorganisms that can grow only in the optimum conditions. There are parameters including the concentration of macro and microelements in nutrient solution, pH, temperature and light intensity that have significant impact on microalgal growth. In recent years, various sensing devices have been developed for sensitive measurement of these parameters during microalgal growth. In this study, a new potentiometric nitrate selective sensor was developed to indicate the nitrate uptake of microalgae and the effect of nitrate nutrient on microalgal growth, specifically, and this sensor was successfully applied to determine nitrate concentration in medium during microalgal growth. Moreover, the effects of nitrate, carbonate and phosphate concentration in the growth medium on biomass production of Chlorella minutissima were investigated by using Box–Behnken design method, and optimum conditions were determined for the highest biomass production of microalgae. As a result of the experiments, it was seen that the highest C. minutissima production was achieved using the medium consist of 2.63 g/L NaNO3, 0.35 g/L Na2CO3 and 0.4 g/L KH2PO4. Statistically, it was observed that there was a proportional relationship between the microalgae production and investigated parameters such as carbon, nitrogen and phosphate amounts of culture mediums. The electrode showed a wide linear range between 1.0 × 10−1 and 5.0 × 10−5 M with a detection limit of the 5 × 10−6 M and the response time was found as 10 s. The results showed that developed nitrate selective sensor could be successfully applied for continuous measurement of nitrate in microalgal productions at reduced cost.

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“…In the last decade, the environmental pollution caused by organic chemicals has received much attention. The main sources of organic matter in wastewater are synthetic dyes from the textile industry [ 1 ] and lignin from the paper industry [ 2 ]. For example, various dyes such as anthraquinones, azo, and triphenylmethane compounds in wastewater threaten aquatic organisms and human health [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Design and Engineering of an Efficient Peroxidase Using Myoglobin for Dye Decolorization and Lignin Bioconversion

Guo

Sheng-Tao

et al. 2021

IJMS

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The treatment of environmental pollutants such as synthetic dyes and lignin has received much attention, especially for biotechnological treatments using both native and artificial metalloenzymes. In this study, we designed and engineered an efficient peroxidase using the O2 carrier myoglobin (Mb) as a protein scaffold by four mutations (F43Y/T67R/P88W/F138W), which combines the key structural features of natural peroxidases such as the presence of a conserved His-Arg pair and Tyr/Trp residues close to the heme active center. Kinetic studies revealed that the quadruple mutant exhibits considerably enhanced peroxidase activity, with the catalytic efficiency (kcat/Km) comparable to that of the most efficient natural enzyme, horseradish peroxidase (HRP). Moreover, the designed enzyme can effectively decolorize a variety of synthetic organic dyes and catalyze the bioconversion of lignin, such as Kraft lignin and a model compound, guaiacylglycerol-β-guaiacyl ether (GGE). As analyzed by HPLC and ESI-MS, we identified several bioconversion products of GGE, as produced via bond cleavage followed by dimerization or trimerization, which illustrates the mechanism for lignin bioconversion. This study indicates that the designed enzyme could be exploited for the decolorization of textile wastewater contaminated with various dyes, as well as for the bioconversion of lignin to produce more value-added products.

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Resource recovery from industrial effluents through the cultivation of microalgae: A review

Cited by 79 publications

References 94 publications

Biochemical and Morphological Changes Triggered by Nitrogen Stress in the Oleaginous Microalga Chlorella vulgaris

Biochemical and Morphological Changes Triggered by Nitrogen Stress in the Oleaginous Microalga Chlorella vulgaris

Monitoring microalgal growth of Chlorella minutissima with a new all solid‐state contact nitrate selective sensor

Design and Engineering of an Efficient Peroxidase Using Myoglobin for Dye Decolorization and Lignin Bioconversion

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