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Related Concept Videos

Operant Conditioning01:21

Operant Conditioning

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Operant conditioning, a key concept in behavioral psychology, involves using reinforcement and punishment to alter the likelihood of a behavior being repeated. B.F. introduced this type of conditioning. Skinner focused on voluntary behaviors and the consequences that follow them, influencing whether these behaviors will be strengthened or diminished.
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Dry Friction01:30

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Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
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The operational amplifier, often referred to as an op-amp, is a multifaceted building block of a circuit. This electronic component functions like a voltage-controlled voltage source and can also be used to create a voltage- or current-controlled current source. The design of an operational amplifier enables it to execute mathematical operations when external components like resistors and capacitors are linked to its terminals. An op-amp has the capacity to sum signals, amplify a signal,...
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Related Experiment Video

Updated: Jan 31, 2026

Microalgae Cultivation and Biomass Quantification in a Bench-Scale Photobioreactor with Corrosive Flue Gases
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Microalgae Cultivation and Biomass Quantification in a Bench-Scale Photobioreactor with Corrosive Flue Gases

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Optimizing the operational conditions for microalgae biomass drying using tray dryers.

R López Pastor1,2, M G Pinna-Hernández3,4, J A Sánchez Molina5,6

  • 1Solar Energy Research Centre (CIESOL), Joint Centre University of Almería-CIEMAT, Almería, 04120, Spain. rlp648@ual.es.

Scientific Reports
|January 29, 2026
PubMed
Summary

Tray drying of Chlorella microalgae biomass is feasible, with thinner layers and higher temperatures reducing drying time. However, increased temperature and time lead to pigment degradation, requiring optimization for biorefineries.

Keywords:
Biomass degradationDrying kineticsModellingPre-treatment

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Area of Science:

  • Biomass valorization
  • Drying technology
  • Microalgae processing

Background:

  • Drying microalgae biomass is crucial for stability and downstream applications but is energy-intensive.
  • Conventional drying methods present challenges in terms of energy efficiency and product quality.
  • Tray drying offers a potential alternative for microalgae biomass processing.

Purpose of the Study:

  • To evaluate the technical feasibility and performance of tray drying for Chlorella sp. biomass.
  • To investigate the impact of drying temperature and biomass layer thickness on drying kinetics.
  • To assess the effect of drying conditions on microalgae pigment quality.

Main Methods:

  • Experiments were conducted using Chlorella sp. biomass in a simulated industrial tray dryer.
  • Drying temperatures ranged from 60 to 80 °C, with layer thicknesses from 0.3 to 1.0 cm.
  • Drying kinetics were modeled using a power-law equation, and pigment quality was analyzed spectrophotometrically.

Main Results:

  • Reduced drying times were achieved with thinner biomass layers and higher temperatures, reaching full dehydration in 5 hours at 80 °C and 0.3 cm thickness.
  • A significant trade-off was observed between drying efficiency and biomass quality, with pigment degradation increasing with higher temperatures and longer drying durations.
  • A polynomial model was developed to predict pigment deterioration based on operational parameters.

Conclusions:

  • Tray drying is a viable method for microalgae biomass processing, offering reduced drying times.
  • Optimizing tray drying parameters is essential to balance energy efficiency with the preservation of valuable biomass components like pigments.
  • The study provides a framework for designing and scaling up tray drying systems for microalgae biorefineries.