Three large components to create a smooth and efficient cycle for a clean safe new world:

-Source of power
Solar power and wind power can be two excellent non waste producing forms of energy to power plastic shredding plants.

Excellent link for example,

-Sorting plastics
Sorting plastics will be a tough cookie to crumble, but some creative ways to sort plastic into specific categories can help boost productivity and efficiency when manufacturing specific products.

-3D Printing
New recycled plastic can be perfect to be extruded into usable 3D printable material. 3D printing can reproduce all new recycled plastic products for the world to then be reused.

Each of these three components can be esensitial to start the huge recycling wheel and save the world.

Any thoughts or questions on each point would gladly be appreciated