Optimization of mechanical harvesting of microalgae by centrifugation for biofuels production

Abu‐Shamleh, Amer; Najjar, Yousef S.H.

doi:10.1016/j.biombioe.2020.105877

Cited by 21 publications

(4 citation statements)

References 36 publications

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“…Hydrocyclones are also used as a centrifugation method. Among the various microalgae densification techniques, centrifugation is one of the most used methods due to the speed of the separation process and its ability to process large volumes with high concentration efficiencies [30].…”

Section: Centrifugationmentioning

confidence: 99%

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A comparative analysis of algal biomass densification methods aimed at the biofuel production

Santos¹,

Bassin²,

Cammarota³

2023

World J. Adv. Eng. Technol. Sci.

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The reduced size of the cells (< 30 µm in diameter) and the low cell concentration of microalgae and cyanobacteria cultures (0.5 g/L on average) greatly hinder the densification of the biomass, a crucial step to becoming biofuel production from algal biomass economically viable. To identify the best densification method, about 90 studies applied to 60 different microalgae and cyanobacteria were compiled through an extensive literature survey, classified into eight methods of algal biomass densification, and analyzed regarding the harvesting efficiency, energy consumption, and costs. Low-cost methods (spontaneous settling, autoflocculation, and bioflocculation) can achieve high densification only with specific species and conditions. On the contrary, many species only achieve high densification using high-cost methods (centrifugation, membrane filtration, electrocoagulation). Based on the analyzed data, researchers should focus on selecting species that combine the desired characteristics for the downstream processes with their potential for biofuel production.

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Section: Centrifugationmentioning

confidence: 99%

“…However, full-scale systems are potentially more expensive due to operating and equipment maintenance costs [25]. [30]. Although centrifugation provides high microalgae cell concentration rates (as presented in Table 1), the product must have high added value to make the microalgae densification method economically viable [31].…”

Section: Centrifugationmentioning

confidence: 99%

A comparative analysis of algal biomass densification methods aimed at the biofuel production

Santos¹,

Bassin²,

Cammarota³

2023

World J. Adv. Eng. Technol. Sci.

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show abstract

“…Centrifugation, the most common method for algae harvesting, is dependent on the centrifugal force applied to the sample. Centrifugation has recovery rates up to and greater than 90% [155][156][157]. Depending on the extent of the angular velocity, denser suspended solids (i.e., algae) move to the edge while the lighter water moves in the other direction, achieving separation.…”

Section: Algae Harvestingmentioning

confidence: 99%

Biological-Based Produced Water Treatment Using Microalgae: Challenges and Efficiency

et al. 2022

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Produced water (PW) is the most significant waste stream generated in the oil and gas industries. The generated PW has the potential to be a useful water source rather than waste. While a variety of technologies can be used for the treatment of PW for reuse, biological-based technologies are an effective and sustainable remediation method. Specifically, microalgae, which are a cost-effective and sustainable process that use nutrients to eliminate organic pollutants from PW during the bioremediation process. In these treatment processes, microalgae grow in PW free of charge, eliminate pollutants, and generate clean water that can be recycled and reused. This helps to reduce CO2 levels in the atmosphere while simultaneously producing biofuels, other useful chemicals, and added-value products. As such, this review focuses on PW generation in the oil and gas industry, PW characteristics, and examines the available technologies that can be used for PW remediation, with specific attention to algal-based technologies. In addition, the various aspects of algae growth and cultivation in PW, the effect of growth conditions, water quality parameters, and the corresponding treatment performance are presented. Lastly, this review emphasizes the bioremediation of PW using algae and highlights how to harvest algae that can be processed to generate biofuels for added-value products as a sustainable approach.

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“…Another recommendation includes utilizing the entire biomass for energy production instead of only the lipid fraction ( Amaro et al, 2017 ). Furthermore, 90% of energy consumption by the disc stack centrifuge can be reduced by optimizing three main factors: particle size, the rotational speed, and the outer radius of the centrifuge bucket ( Abu-Shamleh and Najjar, 2020 ).…”

Section: Microalgal Biomass Manufacturing Technologymentioning

confidence: 99%

Microalgal Biomass as Feedstock for Bacterial Production of PHA: Advances and Future Prospects

Tan

Nadir

Sudesh

2022

Front. Bioeng. Biotechnol.

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The search for biodegradable plastics has become the focus in combating the global plastic pollution crisis. Polyhydroxyalkanoates (PHAs) are renewable substitutes to petroleum-based plastics with the ability to completely mineralize in soil, compost, and marine environments. The preferred choice of PHA synthesis is from bacteria or archaea. However, microbial production of PHAs faces a major drawback due to high production costs attributed to the high price of organic substrates as compared to synthetic plastics. As such, microalgal biomass presents a low-cost solution as feedstock for PHA synthesis. Photoautotrophic microalgae are ubiquitous in our ecosystem and thrive from utilizing easily accessible light, carbon dioxide and inorganic nutrients. Biomass production from microalgae offers advantages that include high yields, effective carbon dioxide capture, efficient treatment of effluents and the usage of infertile land. Nevertheless, the success of large-scale PHA synthesis using microalgal biomass faces constraints that encompass the entire flow of the microalgal biomass production, i.e., from molecular aspects of the microalgae to cultivation conditions to harvesting and drying microalgal biomass along with the conversion of the biomass into PHA. This review discusses approaches such as optimization of growth conditions, improvement of the microalgal biomass manufacturing technologies as well as the genetic engineering of both microalgae and PHA-producing bacteria with the purpose of refining PHA production from microalgal biomass.

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Optimization of mechanical harvesting of microalgae by centrifugation for biofuels production

Cited by 21 publications

References 36 publications

A comparative analysis of algal biomass densification methods aimed at the biofuel production

A comparative analysis of algal biomass densification methods aimed at the biofuel production

Biological-Based Produced Water Treatment Using Microalgae: Challenges and Efficiency

Microalgal Biomass as Feedstock for Bacterial Production of PHA: Advances and Future Prospects

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