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Amsterdam Trials Bubble Barrier to Clean River Waste
Amsterdam is trying out a “bubble barrier” to help remove plastic from the city’s canals by capturing trash hidden beneath the surface of the water.

“A bubble barrier is basically a tube that we place on the bottom of the river or canal, that has holes in it and we press air through it; that creates a bubble curtain,” said Francis Zoet, the Great Bubble Barrier project’s technical director.

While Amsterdam already has four boats that collect around 42,000 kg of plastic a year, the boats can only pick up the rubbish on the surface and some smaller pieces are missed altogether. The bubbles work with the flow of water in the canal to float the waste to surface so it can be collected by the debris skimmer boats.

 
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Chemical Promotes Dangerous Algae Blooms - Wisconsin is not fully enforcing strict phosphorus limits adopted two years ago to reduce lake-algae blooms that make people sick. The state Legislature in 2010 approved DNR regulations intended to cut down on the amount of phosphorus running into waterways, where it causes algae to grow so thick that the water turns to green soup. The regulations are aimed at wastewater treatment plants, paper mills and factories – which are required to reapply for permits at five-year intervals.


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