On ScienceDaily we found an interesting study:
According to this report a Swedish research team has developed a process that enable to recycle any type plastic into new, high quality plastics. This method requires to break down plastic waste on the molecular level, which requires to heat up to 850 °C. The result of this is a gas that could then be used to produce new plastics.
We should note that in the context of orbital space settlements, we can easily heat up plastic waste, using solar furnaces. And through the sale of high quality plastics at market prices, we can reduce or even eliminate the need to introduce a waste disposal fee.