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Related Concept Videos

Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Biofuels

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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Related Experiment Video

Updated: May 9, 2026

Determination of the Settling Rate of Clay/Cyanobacterial Floccules
06:00

Determination of the Settling Rate of Clay/Cyanobacterial Floccules

Published on: June 11, 2018

Modeling microalgal flocculation and sedimentation.

S Salim1, L Gilissen, A Rinzema

  • 1Bioprocess Engineering, AlgaePARC, Wageningen University, Wageningen, The Netherlands. sina.salim@gmail.com

Bioresource Technology
|August 1, 2013
PubMed
Summary
This summary is machine-generated.

A new model accurately predicts microalgal sedimentation times, aiding in designing efficient biomass pre-concentration systems. This flocculation and sedimentation model helps determine optimal settling tank conditions for microalgal harvesting.

Keywords:
FlocculationHarvestingMicroalgaeModelingSedimentation

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

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Area of Science:

  • Bioprocess Engineering
  • Environmental Science
  • Biotechnology

Background:

  • Microalgal biomass harvesting is crucial for biofuel and bioproduct applications.
  • Efficient pre-concentration of microalgal suspensions is a key challenge in downstream processing.
  • Existing models may not fully capture the complex dynamics of flocculation and sedimentation.

Purpose of the Study:

  • To develop and validate a combined flocculation and sedimentation model.
  • To predict the time required for microalgal suspensions to reach a target concentration in a sedimentation tank.
  • To provide a tool for optimizing settling tank design for microalgal biomass pre-concentration.

Main Methods:

  • Development of a mathematical model integrating flocculation and sedimentation processes.
  • Description of particle concentration as a function of time and position within the tank.
  • Validation of the model using experimental data for Ettlia texensis.

Main Results:

  • The model accurately predicted concentration changes over time at various heights in the sedimentation vessel.
  • Experimental data for Ettlia texensis showed good agreement with model predictions.
  • The model predicted a 25-hour settling time to reach 5.2 gDW L(-1) from an initial 0.26 gDW L(-1) in a 1m tank.

Conclusions:

  • The developed model is a reliable tool for predicting microalgal sedimentation behavior.
  • The model can be effectively used to design settling tanks for efficient microalgal biomass pre-concentration.
  • This approach facilitates the optimization of microalgal harvesting processes before dewatering.