New insights on improved growth and biogas production potential of Chlorella pyrenoidosa through intermittent iron oxide nanoparticle supplementation

Rana, Mohit Singh; Bhushan, Shashi; Prajapati, Sanjeev Kumar

doi:10.1038/s41598-020-71141-4

Cited by 29 publications

(3 citation statements)

References 65 publications

(103 reference statements)

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“…Many studies used algae to remove dyes and heavy metals from wastewater 29 , 101 , 102 . The lipid yields by algae can be stimulated by some factors such as ultrasonication 103 and addition of iron oxide nanoparticles to the algae growth media 104 – 107 .…”

Section: Resultsmentioning

confidence: 99%

Statistical optimization for simultaneous removal of methyl red and production of fatty acid methyl esters using fresh alga Scenedesmus obliquus

El‐Naggar

Hamouda

Abou-El-Souod

2022

Sci Rep

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Microalgae are a diverse group of microorganisms, the majority of which are photosynthetic in nature. Microalgae have different applications, the most important of which is the biological treatment of wastewater. Microalgae grow in various types of wastewater, such as wastewater polluted by Azo dyes, due to microalgae using wastewater as a culture medium, which contains many nutrients like nitrogen, phosphate, and carbon sources. Microalgae grow in various types of wastewater, such as wastewater polluted by Azo dyes, due to microalgae using wastewater as a culture medium, which contains many nutrients like nitrogen, phosphate, and carbon sources. So, microalgae are used for bioremediation of wastewater due to the efficiency of growing in wastewater and for the high production of lipids followed by trans-esterification to biodiesel. Face-centered central composite design (FCCCD) was used to determine the factors that have the most significant impact on the simultaneous decolorization of methyl red and lipid production by the fresh green alga Scenedesmus obliquus. The predicted results indicated that the alga decolorized 70.15% methyl red and produced 20.91% lipids by using 1 g/L nitrogen, an incubation time of 10 days, a pH of 8, and the concentration of methyl red is 17.65 mg/L. The dry biomasses of S. obliquus were also examined by SEM and FTIR before and after treatment with methyl red. SEM and FTIR showed that the properties of dry S. obliquus were altered after the biosorption of methyl red. According to GC–MS analysis of hexane extracts of S. obliquus, the lipid profile differed before and after methyl red decolorization. The results proved that it is possible to use S. obliquus to remove dyes and produce renewable fuels such as biodiesel. The novelty of this study is that this is the first time in which the effect of nitrogen concentrations in the medium used for algal growth on the removal of dye has been studied.

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Section: Resultsmentioning

confidence: 99%

Statistical optimization for simultaneous removal of methyl red and production of fatty acid methyl esters using fresh alga Scenedesmus obliquus

El‐Naggar

Hamouda

Abou-El-Souod

2022

Sci Rep

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“…Peng et al 32 showed AD of waste-activated sludge by adding magnetite at a dosage of 27 g/L, and the average methane production increased by 7.3%. Rana et al 34 found that the biogas production and methane content enhanced by 25.14 and 22.37%, respectively, with an increase in iron oxide nanoparticles (IONPs) dose to 30 mg/L, compared with the control. Table 2 shows that conductive materials could increase methane production during AD of organic solid waste.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Enhanced Methane Generation from Anaerobic Tridigestion of Organic Solid Wastes by Direct Interspecies Electron Transfer Stimulation

Liu

Zhao

et al. 2021

ACS Sustainable Chem. Eng.

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One of the major challenges of anaerobic codigestion (AcoD) treatment of municipal solid waste (MSW) is the low efficiency of electron transfer between syntrophic bacteria and methanogens. In this study, an effective strategy to improve the methanogenesis efficiency during tridigestion of food waste (FW), kitchen waste (KW), and fruit/vegetable waste (FVW), via adding magnetite to promote direct interspecies electron transfer (DIET), was proposed. The results showed that the accumulative methane yield increased with the addition of magnetite and the maximum cumulative methane yield was 592.56 mL/gVS at the dosage of 6 g/L and was 31.97% higher than control. Magnetite significantly accelerated the degradation of volatile fatty acids (VFAs), such as acetic, propionic, and butyric acids. Electrochemical measurements and scanning electron microscopy (SEM) analyses showed that magnetite attached to the surface of the sludge and improved the redox capacity of inoculated sludge; the values of electron-donating capacity (EDC) and electron-accepting capacity (EAC) increased by 21.58 and 23.69%, respectively. Microbial community analysis revealed that the dominant bacteria were Chloroflexi, Firmicutes, and Actinobacteria. The growth of Methanosaeta and Methanosarcina was promoted after adding magnetite to the system, which also contributes to the enhanced methane production via involving in DIET during the anaerobic tridigestion process.

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“… Salama et al [ 160 ] Chlorella pyrenoidosa + α-Fe 2 O 3 NPs (at the 12th day of growth period) α-Fe 2 O 3 NPs (30 mg L −1 ) Increase in biogas (25.14%) and methane (22.40%) yield. Rana et al [ 161 ] Barley straw ( Hordeum vulgare L.) (0.4 mm) + ZnO NPs Chemically and Biologically ( Antithamnion plumula extract) synthesized ZnO NPs (10 mg L −1 ) Higher biogas yield in barley straw (0.4 mm) treated with biologically (390.5 mL/g VS) and chemically (385.0 mL/g VS) synthesized ZnO NPs as compared to barley straw (mechanically pretreated) without enrichment of ZnO NPs (340 mL/g VS) and control (untreated biomass) (279 mL/g VS). Hassaan et al [ 162 ] Enteromorpha (microwave pretreated) + MgO NPs MgO NPs (5 and 15 mg L −1 ) Enteromorpha (microwave pretreated at 800W, 4 min) + MgO NPs (15 mg L −1 ) = 342 mL (biogas yield).…”

Section: Solutionsmentioning

confidence: 99%

Overview on agricultural potentials of biogas slurry (BGS): applications, challenges, and solutions

Kumar

Verma

Sharma

et al. 2022

Biomass Conv. Bioref.

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Graphical abstract The residual slurry obtained from the anaerobic digestion (AD) of biogas feed substrates such as livestock dung is known as BGS. BGS is a rich source of nutrients and bioactive compounds having an important role in establishing diverse microbial communities, accelerating nutrient use efficiency, and promoting overall soil and plant health management. However, challenges such as lower C/N transformation rates, ammonia volatilization, high pH, and bulkiness limit their extensive applications. Here we review the strategies of BGS valorization through microbial and organomineral amendments. Such cohesive approaches can serve dual purposes viz. green organic inputs for sustainable agriculture practices and value addition of biomass waste. The literature survey has been conducted to identify the knowledge gaps and critically analyze the latest technological interventions to upgrade the BGS for potential applications in agriculture fields. The major points are as follows: (1) Bio/nanotechnology-inspired approaches could serve as a constructive platform for integrating BGS with other organic materials to exploit microbial diversity dynamics through multi-substrate interactions. (2) Advancements in next-generation sequencing (NGS) pave an ideal pathway to study the complex microflora and translate the potential information into bioprospecting of BGS to ameliorate existing bio-fertilizer formulations. (3) Nanoparticles (NPs) have the potential to establish a link between syntrophic bacteria and methanogens through direct interspecies electron transfer and thereby contribute towards improved efficiency of AD. (4) Developments in techniques of nutrient recovery from the BGS facilities’ negative GHGs emissions and energy-efficient models for nitrogen removal. (5) Possibilities of formulating low-cost substrates for mass-multiplication of beneficial microbes, bioprospecting of such microbes to produce bioactive compounds of anti-phytopathogenic activities, and developing BGS-inspired biofertilizer formulations integrating NPs, microbial inoculants, and deoiled seed cakes have been examined.

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New insights on improved growth and biogas production potential of Chlorella pyrenoidosa through intermittent iron oxide nanoparticle supplementation

Cited by 29 publications

References 65 publications

Statistical optimization for simultaneous removal of methyl red and production of fatty acid methyl esters using fresh alga Scenedesmus obliquus

Statistical optimization for simultaneous removal of methyl red and production of fatty acid methyl esters using fresh alga Scenedesmus obliquus

Enhanced Methane Generation from Anaerobic Tridigestion of Organic Solid Wastes by Direct Interspecies Electron Transfer Stimulation

Overview on agricultural potentials of biogas slurry (BGS): applications, challenges, and solutions

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