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Related Concept Videos

Coagulation01:06

Coagulation

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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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Design of Solid-State Fermentation Systems for Polymer Hydrolytic Extracellular Enzyme Production by Filamentous Fungi
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A low-cost solid-liquid separation process for enzymatically hydrolyzed corn stover slurries.

David A Sievers1, James J Lischeske1, Mary J Biddy1

  • 1National Bioenergy Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA.

Bioresource Technology
|April 4, 2015
PubMed
Summary
This summary is machine-generated.

Adding polyelectrolyte flocculant to lignocellulosic biomass slurries significantly improves filtration, enhancing fuel production efficiency and reducing costs for biofuel conversion processes.

Keywords:
BiofuelsEnzymatic hydrolysisFiltrationFlocculationSolid–liquid separation

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Area of Science:

  • Biomass conversion
  • Chemical engineering
  • Separation processes

Background:

  • Solid-liquid separation of lignocellulosic biomass slurries is crucial for biofuel production.
  • Lignin-rich cakes in corn stover slurries impede filtration, reducing process efficiency.

Purpose of the Study:

  • To evaluate the effectiveness of polyelectrolyte flocculant in improving the filterability of corn stover slurries.
  • To assess the impact of improved filtration on the overall cost-effectiveness of biofuel production.

Main Methods:

  • Treatment of corn stover slurries with polyelectrolyte flocculant.
  • Filtration experiments to measure filterability and flux.
  • Techno-economic analysis to determine production cost changes.

Main Results:

  • Polyelectrolyte treatment increased mean particle size and filterability of slurries.
  • Filtration flux improved approximately 40-fold, increasing filter unit capacity.
  • Overall fuel production costs were significantly reduced, especially for challenging alkaline pretreated slurries.

Conclusions:

  • Polyelectrolyte flocculation is an effective strategy to overcome filtration challenges in lignocellulosic biomass processing.
  • Improved solid-liquid separation via flocculation leads to substantial reductions in biofuel production costs.
  • This method enhances the economic viability of converting biomass to transportation fuels.