Bioplastics Quiz

Study Notes

Poly-lactic Acid (PLA)

PLA is a biodegradable thermoplastic derived from renewable resources, such as corn starch or sugarcane.
The production involves the fermentation of carbohydrates to produce lactic acid, which is then polymerized to form PLA.

Properties of Bioplastics

Bioplastics exhibit similar properties to conventional plastics, such as flexibility and durability.
They are often biodegradable or compostable, reducing environmental pollution.
Bioplastics can have varied mechanical and thermal properties suited for different applications.

Environmental Impacts of Bioplastics

Bioplastics can lower greenhouse gas emissions compared to traditional plastics.
They contribute less to fossil fuel depletion since they utilize renewable resources.
Improper disposal can still lead to environmental concerns, such as soil and water pollution, if not managed effectively.

Five Stages in Downstream Processing After Fermentation

Separation: The initial step involves separating the biomass from the fermentation broth.
Purification: Targeted compounds are further purified to remove impurities.
Concentration: Concentration of the desired products is performed to enhance quality and reduce volume.
Formulation: The final products are formulated for specific uses.
Storage: Proper storage techniques are applied to maintain product integrity until further use.

First Step in Product Recovery in Downstream Processing

The first step usually involves separating the microbial biomass from the fermentation broth to isolate the product efficiently.

Methods for Solid-Liquid Separation

Common methods include centrifugation, filtration, and sedimentation.
Each method has its advantages and is chosen based on the characteristics of the fermentation broth and desired purity.

Flotation in Solid-Liquid Separation

Flotation increases the efficiency of solid-liquid separation by introducing air bubbles that adhere to solid particles.
As the bubbles rise, they carry the solids to the surface, forming a froth that can be removed.

Flocculation Process

Flocculation involves the aggregation of particles into larger clusters, or flocs, facilitating easier separation.
This process typically employs flocculants (chemicals) that neutralize charges on particles, promoting their coalescence during separation.

Description

Test your knowledge about bioplastics with this quiz! Learn about the properties, environmental impacts, and types of bioplastics, including aliphatic polyesters like Poly-lactic Acid (PLA). Explore the production and biodegradation of PLA, as well as its role in the carbon cycle of bioplastics.