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Can biodegradable plastic be composted?

25-07-2020

Can biodegradable plastic be composted?

biodegradable bags

1. 100% biodegradable plastics can be biodegraded under composting conditions, and can also be biodegraded under other conditions such as anaerobic conditions, and can also be biodegraded under natural environments such as soil and seawater, but the specific chemical structure of the plastic The formulation of the product is related to the degradation environmental conditions. Generally speaking, it is wrong to say that biodegradable plastics can be composted.

Materials like PHA and PBAT are relatively easy to biodegrade under seawater, soil, and composting conditions, while PLA is relatively easy to biodegrade under composting conditions, Biodegradable Trash Bags and the degradation cycle or speed under seawater and soil conditions is relatively slow.


2. Can biodegradable plastics be completely degraded under anaerobic digestion conditions?

The main reason that biodegradable plastics can be degraded by microorganisms is that their chemical structure is different from traditional plastics, so they can be degraded by microorganisms. Biodegradable Garbage Bags Most of the currently known biodegradable materials can be degraded by microorganisms under anaerobic conditions.


3. Can biodegradable plastics be completely degraded in the soil?

Since the conditions of temperature, moisture, microorganisms, etc. are uncontrollable in the natural soil, the conditions are relatively uncontrollable compared to the situation where the conditions are controlled in the composting process. At present, from the results of biodegradation laboratory and field degradation experiments, most biodegradable plastics are biodegradable in the field soil conditions, Biodegradable clothes packaging bag such as PBAT, PHA, PCL, PBS, etc. under normal climatic conditions when buried in soil for 5 months It can be completely degraded without affecting plants; materials like PLA degrade relatively slowly and take a long time, but after being blended with materials such as PBAT, it can be completely degraded within about half a year from the experimental results.


The following picture is the observation result of our product in the TUV laboratory using natural soil to bury the PBAT, PBAT/PLA, PLA film in the soil. It can be seen from the photo that the biodegradable plastic can be naturally degraded when the soil moisture is sufficient. , And can compost the soil.

biodegradable tableware

Click the picture to view the complete test report


4. Can biodegradable plastics be completely degraded in seawater?

There are also microorganisms that adapt to high-salt environments in seawater. Materials like PHA and PBAT can be completely degraded in about 30-60 days under the conditions of seawater and 25℃±3℃.



5. Will the degradation products or degradation of biodegradable plastics cause secondary environmental hazards?

Everyone is particularly concerned about whether the degradation products of biodegradable plastics will cause secondary harm to the environment. Biodegradable Disposable Straw Therefore, when the degradation performance of biodegradable plastics is required, the index of heavy metal content has been increased and strict requirements have been imposed.

biodegradable straws

Eco-toxicity tests of compostable plastics and their compost after composting were carried out, including phytotoxicity test and earthworm toxicity test.

In addition to degradability and heavy metal content regulations for soil degradable biodegradable mulch, Biodegradable Cups the new international standards also stipulate ecological toxicity.

Therefore, from the current point of view, biodegradable plastics that meet the requirements of the standard will not cause secondary harm to the environment after degradation.


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