In many parts of the world there are heavy metal problems. Be it from radioactive sources, or from oil based vehicles going by our road & water ways. Here are some ways to deal with these problems.
2 of the best things one could possibly use is sunflowers, and C. Sativa. I know of no places where you can currently use industrial, or medical C. Sativa for this purpose sadly. Both plants pull up heavy metals as we all as radioactive particles. Sunflowers were used, and are still used all over Japan's nuclear radiated zones. Oyster mushrooms do the same thing but have the added bonus of still being edible. One can even use oyster mushrooms to clean up oil spills both on the property, and at large elsewhere in the world. These are then pulled from the ground (sadly) and removed from the site and taken to a proper radioactive incineration facility.
If someone places more willows & vetiver along the major roadway by the river to help the river with petrol products along the road as well. People can also use some scented geraniums along roads as well to help with the lead and other exhausts.
The plant Water Hyacinth which is a nuisance in many areas also help remove lead that gets into the water system. Research has also found out that Fish bones are made of the phosphate mineral apatite, which readily combines with lead to form pyromorphite, a stable crystalline mineral that can’t be absorbed by the human digestive system.1,2 Now researchers are using fish bones and other phosphate-rich amendments to remediate lead in urban soils. “We have seen reduction in bioaccessibility in some lab samples up to fifty percent within just a few weeks of treatment,” says Steve Calanog of the U.S. Environmental Protection Agency (EPA), who is overseeing an agency project using fish bones to clean up soils in the South Prescott neighborhood of Oakland, California.
Luckily shellfish also contain this mineral and is also a ready free source of material to me and people along the coastal areas of the world. Spreading it just like one would dolomite works well, and doesn't require the destruction & use of petrol chemicals that dolomite does require.
There are a great many ways to bioremediate soil & water, just takes research and patience to do something right as with many things in life.
(Source: EPAWest Oakland Lead Cleanup. San Francisco, CA:U.S. Environmental Protection Agency, Region 9 (Jul 2011). Available: http://www.epaosc.org/sites/5604/files/West%20Oakland%207_11%20Book.pdf
Miretzky P, Fernandez-Cirelli A.. Phosphates for Pb immobilization in soils: a review. Environ Chem Lett 6(3):121–133. 2008. http://dx.doi.org/10.1007/s10311-007-0133-y
Wright J, et al. PIMS Using Apatite II™: How It Works To Remediate Soil and Water. In: Sustainable Range Management-2004, Hinchee RE, Alleman B, eds. Columbus, OH:Battelle Press (2004). In: Proceedings of the Conference on Sustainable Range Management, 5–8 Jan 2004, New Orleans, LA. Available: http://www.pimsnw.com/files/1howapatiteiiworks30.pdf [accessed 12 Dec 2011] )