English to French Other Environment & Ecology

I'd just like to make sure that "purifying" translates by "éliminant" here.

Micro-pollutants mix in peat bogs, wetland meadows of marshes, mallow, tall
grasses and dense thickets of reeds.
Hardwoods forests of ash, elm, alder and oak
creep to the edge of cultivated lands of farm and field.
This is the tidal zone.

Wetlands play an important part in regulating flow of water and matter.
The biochemical recycling of soils move organic matter by diffusing pollutants and
purifying nitrates within disrupted waters.
The river is the keeper of this clockwork of geological time.
Geologists study this maximum turbidity zone, where the finest silts are being mixed
around in the estuaries.