This is a story about a bioremediation system. A constructed wetland is compared against mechanical filtration. Bob http://m.huffpost.com/us/entry/4568046
On every important measure — capital expenditure, operational expenditure, and performance — the constructed wetland outperformed the traditional approach. Power consumption and CO2 emissions were reduced by 98 percent, which lowered operating expenses dramatically. And as a bonus, the wetland provides habitat for fish and hundreds of species of migratory birds.