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The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...
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Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
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Bioreactors are engineered vessels designed to cultivate microorganisms under controlled conditions for industrial bioprocessing. They maintain sterility and allow precise regulation of pH, temperature, oxygen, and nutrient levels to optimize microbial growth and metabolite production. Bioreactors range from small laboratory units of 1 liter to industrial systems holding up to 500,000 liters, though only about 75% of their volume is actively used for fermentation. The remaining headspace...
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The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
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Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
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Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to...
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Design and Analysis of Macroalgae-Based Biorefineries.

Alexander Golberg1

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Summary

Marine biorefineries using offshore macroalgae offer a sustainable alternative to fossil fuels and terrestrial biomass. This chapter details their design, integrating efficiency, economics, and environmental factors for future implementation.

Keywords:
Co-productsEnvironmental exergonomicsExergy efficiencyFermentationMacroalgaeMarine biorefinery designOffshore cultivationSeaweed

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Area of Science:

  • Sustainable energy and biomaterials
  • Marine biotechnology
  • Biorefinery design

Background:

  • Global challenges include displacing fossil fuels and increasing sustainable food/materials production.
  • Terrestrial biomass and microalgae face sustainability concerns (energy balance, water use, processing).
  • Offshore macroalgae present a promising, sustainable feedstock for biorefineries.

Purpose of the Study:

  • To present the fundamental principles for designing marine biorefineries.
  • To discuss methods for integrating thermodynamic efficiency, economic viability, and environmental impact.
  • To highlight performance improvements through optimized cultivation, dewatering, and conversion processes.

Main Methods:

  • Analysis of basic marine biorefinery design principles.
  • Integration of thermodynamic, economic, and environmental assessment methods.
  • Development of cultivation, dewatering, and conversion techniques tailored to macroalgae.

Main Results:

  • Demonstration of integrated design principles for marine biorefineries.
  • Identification of key areas for performance improvement in macroalgae processing.
  • Showcasing advancements in cultivation, dewatering, and conversion technologies.

Conclusions:

  • Marine biorefineries offer a viable sustainable pathway for energy, food, and materials.
  • Technological, economic, and environmental analyses are crucial for successful implementation.
  • Optimized processes leveraging macroalgae's unique properties are key to unlocking their potential.