Nutrient recovery and biogas generation from the anaerobic digestion of waste biomass from algal biofuel production

Ayala-Parra, Pedro; Liu, Yuanzhe; Field, Jim A.; Sierra-Álvarez, Reyes

doi:10.1016/j.renene.2017.02.085

Cited by 82 publications

(16 citation statements)

References 31 publications

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“…Microalgae, which could fast convert CO 2 into biomass, have got an increasing interesting role in biofuel production [1].…”

Section: Introductionmentioning

confidence: 99%

“…Microalgae have shown great potential to produce a wide variety of fuel products in present studies [3,4]: (1) hydrogen (H 2 ) via direct and indirect biophotolysis [5], (2) biodiesel through transesterification [6], (3) biomethane via anaerobic digestion [7], (4) bioethanol by fermentation [8], and (5) bio-oil via thermochemical conversion [9].…”

Section: Introductionmentioning

confidence: 99%

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Optimization to Hydrothermal Liquefaction of Low Lipid Content Microalgae Spirulina sp. Using Response Surface Methodology

Wei

Jie

2018

Journal of Chemistry

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The production and nature of the biocrude obtained from Spirulina sp. by hydrothermal liquefaction (HTL) technology is focused in this investigation. Our aim is to evaluate the interaction of different factors on the bio-oil production through HTL using microalgae that contains relatively low lipid content and high protein. Optimization of three key parameters—concentration (mass of algae per mass of solvent), reaction temperature, and holding time—was carried out by response surface methodology (RSM). In this work, we used central composite design to conduct the experiment process. Graphical response surface and contour plots were used to locate the optimum point. The final results showed that the optimum concentration, temperature, and holding time were 10.5%, 357°C, and 37 min, respectively. Under the optimum conditions established, yield of the biocrude (41.6 ± 2.2%) was experimentally obtained using the fresh microalgae. This study showed the potential of bio-oil production of Spirulina sp. by HTL technology, but it still needs more improvement of the biocrude for utilization.

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“…Microalgae, which could fast convert CO 2 into biomass, have got an increasing interesting role in biofuel production [1].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization to Hydrothermal Liquefaction of Low Lipid Content Microalgae Spirulina sp. Using Response Surface Methodology

Wei

Jie

2018

Journal of Chemistry

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“…The bioavailability test revealed important differences between the liberation of phosphorous and nitrogen (Figure 1). Unlike the common trend of a higher immobilization of phosphorous in anaerobic digestates described by several authors , Balasubramanian and Bai, 1992, our results support former studies of algal digestates where the immobilization of nitrogen was higher (Alcántara et al, 2013, Ayala-Parra et al, 2017, Bohutskyi et al, 2015. According to our results, 55% of the total nitrogen remained immobilized in the solid digestate (i.e.…”

Section: Nutrient Bioavailabilitysupporting

confidence: 87%

Development of a closed loop microalgal oil production system through anaerobic digestion and nutrient recycling

Gonzalez¹

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The world needs new energy sources that give adequate yields at low economic and environmental costs. Biofuels such as biodiesel and biogas are viable options to offset usage of traditional fossil fuels and reduce environmental damage. In this context, microalgae are promising organisms for biodiesel production due to their capacity to accumulate significant amounts of lipids. Additionally, anaerobic digestion is becoming an efficient and widely utilized system for the generation of renewable biogas; and microalgae are a suitable substrate for such purpose. To date, research on microalgal biofuels has been performed mainly at a pilot-scale due to economic considerations and, in some cases, negative energy balances of the processes or potentially unsustainable practices. For example, a large amount of mineral fertilizer is often used to mass-produce microalgae. More research is required to make biofuel production more sustainable and suitable at large scale. An attractive way to overcome these issues is to develop an integrated production system with minimal inputs to reduce the environmental cost of production by recycling nutrients. This can be achieved through the anaerobic digestion of algal biomass. The anaerobic digestion process not only produces biogas but also allows nutrient recycling for repeat algae cultivation. On the other hand, lipid extraction for biodiesel production leaves a residue that is a potential substrate for anaerobic digestion. Lipid-extracted biomass may have an advantage over pure algal cultures of a higher native digestibility due to cell disruption during the lipid extraction process. Hence, an integrated system of biodiesel and biogas production using anaerobic digestion effluent as a nutrient source for algae growth and lipid-extracted biomass as substrate for digestion may present a good option. This thesis focused on the optimization of a closed nutrient loop for oil and biogas production through anaerobic digestion of microalgae. The study was oriented towards the scalability of the system aiming to optimize the main aspects that currently jeopardize the application of the proposed biorefinery at large scale. To address these issues three main aspects were investigated: (1) Wet and solvent-free lipid extraction, (2) Osmotic shock as pre-treatment for lipid extraction and biogas production and (3) Nutrient recycling for algae growth. This dissertation has been structured as follows: Chapter 1 is a literature review of the system proposed. Chapter 2 evaluates the anaerobic digestion of the microalga Scenedesmus dimorphus under continuous conditions as well as the potential of the anaerobic digestate as culture medium for the same species. In chapter 3 the feasibility of a wet solvent-free lipid extraction procedure by using osmotic shock is evaluated as pre-treatment. The species Dunaliella salina and Chaetoceros muelleri were chosen for this purpose as they have very fragile cell wall. Besides, the methane Publications included in this thesis GONZÁLEZ-GONZÁLEZ, L. M., ELTANAHY, E...

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“…These products are high-value compounds with antioxidant properties, and have potential applications in medicine and pharmaceuticals. The algal biomass and its extracts could also be used for generation of biofuel and biogas through anaerobic digestion [ 46 ].…”

Section: Discussionmentioning

confidence: 99%

Synergistic effects in a microbial fuel cell between co-cultures and a photosynthetic alga Chlorella vulgaris improve performance

Aiyer

2021

Heliyon

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Nutrient recovery and biogas generation from the anaerobic digestion of waste biomass from algal biofuel production

Cited by 82 publications

References 31 publications

Optimization to Hydrothermal Liquefaction of Low Lipid Content Microalgae Spirulina sp. Using Response Surface Methodology

Optimization to Hydrothermal Liquefaction of Low Lipid Content Microalgae Spirulina sp. Using Response Surface Methodology

Development of a closed loop microalgal oil production system through anaerobic digestion and nutrient recycling

Synergistic effects in a microbial fuel cell between co-cultures and a photosynthetic alga Chlorella vulgaris improve performance

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