Cultivation of <i>Nannochloropsis oculata</i> in centrate and conversion of its lipids to biodiesel in a low-cost microwave reactor

Binnal, Prakash; Babu, P. Nirguna

doi:10.1080/17597269.2017.1316141

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…reported lipid productivity ranging between 23 and 161 mg/L/day, despite the overall low FAMEs content of 0.3% (Cho et al, 2011;Mutanda et al, 2011). From blended sludge or centrate (liquid removed from thickened sludge) produced biomass, both Nannochloropsis oculata and Chlorella protothecoides were shown to have a high lipid accumulation potential, 24% and 29% of lipid content, respectively (Binnal and Nirguna Babu, 2017;Zhou et al, 2012). The data for Nannochloropsis (over 23% of FAMEs content) indicate its suitability for biodiesel production.…”

Section: Oleaginous Microorganismsmentioning

confidence: 99%

Assessment of the production of biodiesel from urban wastewater-derived lipids

Frkova

Venditti

Herr

et al. 2020

Resources, Conservation and Recycling

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Production of biodiesel is one of the most important European targets within renewables for the future. To consider biodiesel a feasible alternative to fossil fuel, unconventional resources need to be exploited. This review aims to provide up-to-date knowledge on the existing reuse of lipids from urban wastewater to produce biodiesel. Lipids are readily removed by mixed microbial populations during wastewater treatments in sewage plants. Assessment results on potential annual European market supply indicate 3-414 10 4 tons (min for activated and max for grease trap sludge) of potentially extractable biodiesel from wastewater and an expected biodiesel demand of 14.8 10 6 tons. Considering the prospect of transforming sewage plants into biorefineries, we may cover on average 1.5, 6.2, 6.7 and 24.4% of activated, primary, scum and grease trap sludge respectively, of the European biodiesel market from wastewater-derived lipids. In addition, by implementing an optimized biotechnology selector, the overall biodiesel yield could be higher due to increased lipid incorporation into microbial biomass. This is not an insignificant amount and, if efficiently implemented, could represent an exploitable resource for biofuel production, an important and desired step towards a circular economy. The technology readiness level is still very low. There are several challenges and possible drawbacks, e.g., biogas yield loss, substrate depletion, or formation of floating sludge. Finally, no definitive legislative barriers towards wastewater-derived lipids have been identified; however, quality criteria as well as waste status have to be defined. Recently, many reports and regulations have been introducing circular economy principles in areas where sustainability of renewables is strongly considered. Generally, renewable sources having a high environmental impact such as indirect land use change due to crop-to-fuel cultivation, which needs to be better regulated. Accordingly, the limit

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Section: Oleaginous Microorganismsmentioning

confidence: 99%

Assessment of the production of biodiesel from urban wastewater-derived lipids

Frkova

Venditti

Herr

et al. 2020

Resources, Conservation and Recycling

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“…Several researchers also studied microwave-assisted transesterification using homogeneous acid catalysts. For instance, Binnal and Babu [81] obtained a BD yield of 97.1% from microalga Nannochloropsis oculata with a moisture content of 80 wt% using a low-cost microwave reactor. First, the ethanolic KOH was used to convert the algal lipids into soap.…”

Section: Acid Catalystsmentioning

confidence: 99%

“…First, the ethanolic KOH was used to convert the algal lipids into soap. Further, the soap was separated and subjected to simultaneous acidulation and esterification to produce BD [81]. Sharma et al [82] obtained a BD yield of 84.0% from Chlorella vulgaris via acid-based catalyzed transesterification in a microwave-assisted reactor.…”

Section: Acid Catalystsmentioning

confidence: 99%

Advances in Biodiesel Production from Microalgae

et al. 2023

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Biofuels, as a renewable, eco-friendly, and cost-effective energy source, can reduce the dependence on fossil fuels. The researchers considered different approaches for obtaining high biodiesel yields from microalgae biomass. This work aims to present an overview of the feasibility of microalgae use in biodiesel production. Therefore, biodiesel production from microalgae oil via the transesterification process was explained in detail. The application of non-catalytic transesterification and catalytic transesterification was reviewed. The achievements in the application of homogenous catalysts, heterogeneous catalysts, and enzymatic catalysts for microalgae oil transesterification were discussed. The present technologies for biodiesel production from microalgae need more improvements to increase their efficiencies and reduce costs. Therefore, future research should focus on the development of effective catalysts for biodiesel production from microalgae biomass.

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“…This occurs because they needed a relatively small amount of catalyst for the biodiesel synthesis, which generates smaller liquid waste compared to the homogeneous catalyst process. Strong acid such as sulfuric acid that simultaneously facilitates both transesterification and esterification processes are particularly important for biodiesel synthesis from low-cost raw stocks with high FFA concentration (Binnal and Nirguna Babu, 2019). Therefore, the invention of the novel, more powerful, and less expensive solid catalysts is expected to reduce the overall cost of producing biodiesel from the various oily feedstock.…”

Section: Heterogeneous Catalystsmentioning

confidence: 99%

A Review on the Recent Breakthrough Methods and Influential Parameters in the Biodiesel Synthesis and Purification

Silviana

Anggoro

Hadiyanto

et al. 2022

Int. J. Renew. Energy Dev.

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Biodiesel has recently received much attention as an energy source with numerous benefits such as high degradability, negligible toxicity, and minimal emissions of carbon monoxide gases as well as particulates. Therefore, this research aims to compare, review, and summarize the conventional and advanced methods of biodiesel production. Currently, some emerging processes that were developed for advanced biodiesel production include microwave-assisted synthesis, ultrasonic-assisted synthesis, supercritical transesterification, and liquid phase plasma discharge technology. The types of feedstocks, catalysts, and operating conditions as the influential parameters in biodiesel synthesis are also discussed. Moreover, in the purification process, the effectiveness of purification depends on the type of catalyst applied in the synthesis process. This research also reviewed and compared several commonly used purification methods such as wet and dry washing, ion exchange and precipitation, complexation, and membrane-based separation that have shown significant results along with the impacts of biodiesel production on environmental and economic sectors

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Cultivation of Nannochloropsis oculata in centrate and conversion of its lipids to biodiesel in a low-cost microwave reactor

Cited by 8 publications

References 20 publications

Assessment of the production of biodiesel from urban wastewater-derived lipids

Assessment of the production of biodiesel from urban wastewater-derived lipids

Advances in Biodiesel Production from Microalgae

A Review on the Recent Breakthrough Methods and Influential Parameters in the Biodiesel Synthesis and Purification

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