This Dutch invention uses bubbles to trap plastic trash in rivers. A tube across the riverbed pumps up air and the bubbles form a wall in the water. The wall brings trash to the surface and diverts it to the side where a small container traps it. In tests, the bubble wall caught 86% of trash in the river. The bubble wall doesn't disturb boats, fish and wildlife. And the bubbles do more than just stop trash. The bubbles oxygenate the water, preventing growth of toxic algae. The bubbles also absorb sound from boats, limiting disturbance for fish. Amsterdam is already using bubble walls in a canal and its inventors want to roll it out across the world's rivers.
Source: World Economic Forum, 12 November 2019. Read the full article.