What is the difference between landfilling or incineration of biodegradable plastics and conventional plastics or conventional organic waste?

Some reports suggest that biodegradable plastics produce secondary hazards such as dioxins when incinerated compared to conventional plastics. However, biodegradable plastics are a type of conventional plastic, and their polymer structure does not contain elements such as chlorine, so there are no dioxin emissions when incinerated. In addition, the polyester structure of biodegradable plastics means that they have a lower organic carbon content in the main chain than traditional plastics such as polyethylene, which makes them easier to burn when incinerated. When disposed of by incineration, biodegradable plastics do not produce more emissions than conventional plastics.
In addition, there is concern that biodegradable plastics may release more harmful gases when landfilled, as most modern landfills today have some sort of methane gas collection for energy recovery during the landfill process, and even if methane gas is not recovered, there are measures in place to release methane gas from organic waste after landfilling. The solids content of plastics in landfill waste is less than 7% and the amount of biodegradable plastics is currently less than 1% of conventional plastics, so even if landfilled there would be no further problems affecting landfill methane.