There are about 3 ways to recycle waste plastic, and they are respectively landfill, plastic material recycling as well as plastic thermal pyrolysis into fuel oil. Pyrolysis is the most economical way.
Normally, we can see PP, PE, PS, ABS, LDPE, HDPE, ABS, PVC, PET, etc in our daily life, some of which can be recycled, and some are not easily recycled.