most post consumer plastic grades are easily segregated by plastic type without contamination from other plastic grades and are reprocessed into new material regularly.

1 - PET

2 - HDPE

3 - PVC

4 - LDPE

5 - PP

6 - PS

7 - Other.

The biopharma plastics have many different plastic components that make up 1 tool, which make segregating all the different parts laborious. This is why it's biopharma plastic is considered low grade and can only be recycled into something that has an end use.

China has stopped the import of all raw plastic scrap or baled post-consumer plastic.

They can import clean recycled plastic pellets that have been made from post-consumer plastics.

source - am plastic scrap trader with a focus on export

Single stream systems were sold on the idea it would generate higher volumes of raw material, plastic and fiber, with minimal man power and effort.

Some municipalities i've seen with drop off centers have their residents segregate material into designated bins. i.e. News paper, cardboard, #2 plastics, bulky plastics (lawn furniture etc.) etc.