larryjoe writes: A curtain of bubbles in Amsterdam’s Westerdok canal filters 86% of trash floating down the canal. The bubbles come from a pipe at the bottom of the canal connected to an air compressor. Holes in the pipe allow the bubbles to float to the water surface, forming a water curtain that pushes trash to the water surface. The curtain is positioned in a skewed orientation to allow the downstream water flow to channel the trash to a catchment system. This novel system catches many types of trash without a physical barrier that impedes vehicles or wildlife. The catchment system only keeps trash that is at least 10mm in size to allow small wildlife to escape. This filtering system is being trialed by a small startup.
Read more of this story at Slashdot.