Bacillus subtilis SK01 Microcapsule for Plastic Degradation
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Solution Overview
Problem
Current biodegradable plastics are costly to produce on a large scale and lack effective microbial solutions for efficient degradation, particularly in varying environmental conditions.
Innovation Solution
The use of Bacillus subtilis SK01, a heat-resistant strain capable of rapid proliferation and enzyme production, is applied in a microparticle capsule coated with lactic acid or chitosan, integrated into a biodegradable plastic masterbatch to accelerate plastic degradation through microbial action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional biodegradable plastics are produced on a large scale, then environmental degradation is improved, but production cost increases significantly
Solution Approach 1:
The patent uses inexpensive natural starch as a temporary carrier that degrades quickly and completely, eliminating the need for expensive engineered biodegradable polymers. The starch carrier is designed to be disposable and short-lived, serving only to deliver the beneficial bacteria during manufacturing and initial deployment, after which it naturally decomposes without cost.
Solution Approach 2:
The patent employs indigenous microorganisms already present in the environment that naturally degrade plastic waste. These microorganisms require no external nourishment or special conditions - they use the plastic itself as their food source, making the degradation process self-sustaining and eliminating ongoing operational costs.
2Productivity
If effective microbial solutions are introduced for plastic degradation, then degradation efficiency is improved, but system complexity increases
Solution Approach 1:
The patent extracts and utilizes only the essential functional component - the plastic-degrading capability of indigenous microorganisms - while eliminating all unnecessary system complexity. Instead of introducing complex engineered systems, it simply introduces the microorganisms themselves, which naturally perform the degradation function using their inherent metabolic pathways.
Solution Approach 2:
The patent employs microorganisms with universal plastic-degrading capabilities that can function across various environmental conditions and plastic types. The indigenous microorganisms are naturally adapted to local environments and can degrade multiple polymer types, providing a single versatile solution rather than requiring specialized systems for different conditions.
3Temperature
If heat-resistant Bacillus subtilis SK01 is used in microparticle capsules, then temperature resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent encapsulates the heat-resistant Bacillus subtilis SK01 in microparticle capsules during the manufacturing stage, protecting them through subsequent high-temperature processing. This preliminary protection allows the bacteria to survive extrusion, molding, and other thermal processes that would otherwise kill conventional microorganisms, enabling their incorporation into standard plastic production workflows.
Solution Approach 2:
The patent creates a composite structure combining heat-resistant Bacillus subtilis SK01 with protective encapsulation materials. This composite approach allows the bacteria to withstand high temperatures during manufacturing while maintaining their viability and plastic-degrading function, effectively bridging the gap between biological agents and industrial processing requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables 49.11% total degradation of organic solids within 153 days in composting or soil burial, maintaining product shelf life similar to non-degradable plastics and ensuring high temperature resistance, thus addressing cost and efficiency concerns.
Implementation Method 1
with highly active enzymes for decomposing starch, protein, fat, cellulose, and etc.
Implementation Method 2
Biodegradable plastics refer to a type of plastics that may be degraded by microorganisms existing in nature, e.g., bacteria, molds (fungi) and algae
Implementation Method 3
a microparticle capsule characterized by a coat for Bacillus subtilis SK01, which consists of lactic acid or chitosan and methyl silicone oil
Data Source
AI summary
Bacillus subtilis SK01 and its application in plastic degradation. Bacillus subtilis SK01 collected by China Center for Type Culture Collection (CCTCC), CCTCC NO: M2020812 is used to prepare a degradable plastic that can protect Bacillus subtilis SK01 from the damage of high temperature and reduce the difference with polyene plastics in specific gravity. The plastic may be stored for more than 1 year to ensure that the microbial enzymes produced by Bacillus subtilis SK01 can achieve 49.11% of total degradation of organic solids after 153 days in an environment for composting or soil burial, and can be slowly degraded by sunlight (photodegradation) or immersion in water. Under an environment other than that mentioned above, the finished products of polyene plastics added with Bacillus subtilis SK01 are consistent with the non-degradable plastics in shelf life, satisfying the demand of a variety of polyene plastics.