Decolorization of dyestuffs by some species of green algae and cyanobacteria and its consortium

El‐Sheekh, Mostafa M.; El-Shanshoury, Abd El-Raheem R.; Abou-El-Souod, Ghada W.; Gharieb, Dalia Y.; Shafay, Shimaa M. El

doi:10.1007/s13762-020-03108-x

Cited by 23 publications

(10 citation statements)

References 73 publications

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“…The ability of algae to remove azo dye depends on the pH levels on the medium and the stability of pH in the oxidative enzymes. El-Sheekh et al 6 reported that the best pH to remove azo dye by S. obliquus was 11, due to alga exerted some acidic compounds that released to medium, which neutralize the high pH levels of the medium. Chen et al 35 concluded that the optimum pH levels for high removal efficiency of azo dyes are often ranged from 6 to 10 for most dyes.…”

Section: Resultsmentioning

confidence: 99%

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Simultaneous bioremediation of Disperse orange-2RL Azo dye and fatty acids production by Scenedesmus obliquus cultured under mixotrophic and heterotrophic conditions

Hamouda

El‐Naggar

Abou-El-Souod

2022

Sci Rep

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Several types of green photosynthetic microalgae can grow through the process of heterotrophic growth in the dark with the help of a carbon source instead of the usual light energy. Heterotrophic growth overcomes important limitations in the production of valuable products from microalgae, such as the reliance on light, which complicates the process, raises costs, and lowers the yield of potentially useful products. The present study was conducted to explore the potential growth of green microalga Scenedesmus obliquus under mixotrophic and heterotrophic conditions utilizing Disperse orange 2RL Azo dye as a carbon source to produce a high lipid content and the maximum dye removal percentage. After 7 days of algal growth with dye under mixotrophic and heterotrophic conditions with varying pH levels (5, 7, 9, and 11), KNO3 concentrations (1, 1.5, 2, and 3 g/L), and dye concentrations (20, 40, and 60 ppm); dye removal percentage, algal dry weight, and lipid content were determined. The results showed that the highest decolorization of Disperse orange 2RL Azo dye (98.14%) was attained by S. obliquus in heterotrophic medium supplemented with glucose at the optimal pH 11 when the nitrogen concentration was 1 g/L and the dye concentration was 20 ppm. FT-IR spectroscopy of the dye revealed differences in peaks position and intensity before and after algal treatment. S. obliquus has a high concentration of oleic acid, which is enhanced when it is grown with Disperse orange 2RL Azo dye, making it ideal for production of high-quality biodiesel. In general, and in the vast majority of instances, heterotrophic cultivation is substantially less expensive, easier to set up, and requires less maintenance than mixotrophic cultivation. Heterotrophic cultivation allows for large-scale applications such as separate or mixed wastewater treatment along with biofuel production.

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Section: Resultsmentioning

confidence: 99%

“…Many studies have reported the effectiveness of microalgae in the degradation of azo dyes [5][6][7][8][9] . The growth of microalgae in the textile dye effluent has been recognised as a favourable alternative to conventional methods of wastewater treatment.…”

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confidence: 99%

Simultaneous bioremediation of Disperse orange-2RL Azo dye and fatty acids production by Scenedesmus obliquus cultured under mixotrophic and heterotrophic conditions

Hamouda

El‐Naggar

Abou-El-Souod

2022

Sci Rep

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“…As opposed to adsorption, the degradation of azo dyes has been of significant interest as ideally, the dyes can be completely degraded by the microbial enzymes. Microorganisms capable of decolorizing and degrading dyes include filamentous fungi [87,88], yeasts [89,90], algae [91,92], and bacteria [93][94][95].…”

Section: Biological Treatment Of Dyesmentioning

confidence: 99%

Microbial Degradation of Azo Dyes: Approaches and Prospects for a Hazard-Free Conversion by Microorganisms

Ngo

Tischler

2022

IJERPH

101

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Azo dyes have become a staple in various industries, as colors play an important role in consumer choices. However, these dyes pose various health and environmental risks. Although different wastewater treatments are available, the search for more eco-friendly options persists. Bioremediation utilizing microorganisms has been of great interest to researchers and industries, as the transition toward greener solutions has become more in demand through the years. This review tackles the health and environmental repercussions of azo dyes and its metabolites, available biological approaches to eliminate such dyes from the environment with a focus on the use of different microorganisms, enzymes that are involved in the degradation of azo dyes, and recent trends that could be applied for the treatment of azo dyes.

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“…mixed with S. obliquus (97.58%) after incubation for seven days. [156]. Additionally, It has been noticed that macroalgae have a colorant adsorption capacity on surface of green marine algae.…”

Section: Use Of Algae In Wastewater Treatmentmentioning

confidence: 99%

Application of marine algae separate and in combination with natural zeolite in dye adsorption from wastewater ; A review

et al. 2022

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Industrial wastewater is obtained from industrial activities that include any solids that become useless during the manufacturing process. These wastes are considered as international green problems so significant solutions must be taken to confront these problems and reduce their environmental burden and effect. Removal of dyes from industrial wastes using zeolite and marine algae by adsorption technique has a lot of advantages as the zero cost, obtainability, high effectiveness, and ecological alternative source. Dyes adsorption onto zeolite and marine algae surfaces is a complicated method that affected by numerous factors like contact time, initial dye concentration, solution pH, catalyst weight and temperature. In this review, we present definition of marine algae and their classification, definition of Zeolite , industrial wastewater and their effect on the eco system, water treatment methods which include chemical, biological, Combinatorial method, nanotechnology-based and physical methods, uses of algae and natural zeolite in wastewater treatment and finally we discuss the factors that affect dyes adsorption onto zeolite and marine algae surfaces, such as contact time, temperature, solution pH and catalyst dose. The principal conclusions of this review are that the dye removal% is high in the early time of the adsorption operation but it reduces still it reaches equilibrium, Temperature negatively affects the dye adsorption method, there is a specific pH value for each catalyst, at which the optimum adsorption of dyes happens as well as adsorbent dose growth in general enhances catalytic activity because of the increase in total surface area and the total of active sites on catalyst surface. For optimizing the conditions for dye adsorption onto zeolite and marine algae, the factors that affect dye adsorption onto zeolite and marine algae surfaces should be known.

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Decolorization of dyestuffs by some species of green algae and cyanobacteria and its consortium

Cited by 23 publications

References 73 publications

Simultaneous bioremediation of Disperse orange-2RL Azo dye and fatty acids production by Scenedesmus obliquus cultured under mixotrophic and heterotrophic conditions

Simultaneous bioremediation of Disperse orange-2RL Azo dye and fatty acids production by Scenedesmus obliquus cultured under mixotrophic and heterotrophic conditions

Microbial Degradation of Azo Dyes: Approaches and Prospects for a Hazard-Free Conversion by Microorganisms

Application of marine algae separate and in combination with natural zeolite in dye adsorption from wastewater ; A review

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