De or het afvalsortering?

The correct Dutch article is:

de afvalsortering

Rule Words ending in -ing: almost always de. See the rule

How to use afvalsortering

the afvalsorteringde afvalsortering
this afvalsorteringdeze afvalsortering
that afvalsorteringdie afvalsortering
our afvalsorteringonze afvalsortering
your afvalsorteringjouw afvalsortering
every afvalsorteringelke afvalsortering
which afvalsortering?welke afvalsortering?
a big afvalsortering / the big afvalsorteringeen grote afvalsortering, de grote afvalsortering