One good case is the Vesijärvi case, recently presented to an international audience at the World Water Forum in Marseille.
http://www.puhdasvesijarvi.fi/en/working_together
For information about the various experts, actors and methods required to clean up a lake, check out "the Story of a Lucky Lake". It is a video about lake restoration produced for the Finnish Water Forum:
http://www.finnishwaterforum.fi/en/home/
March 19, 2012 by Saija Vuola
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Jani, to be exact the remediation method depends very much of the type of pollution and site. It is also possible to treat the lake, or the source, depending on the case again. To give an indication of what I'm talking about: Vesijärvi is a good example of "econetwork" type remediation approach of which good information you can find from eg. Juha Kaila from Lahti. Another case is Kirkkojärvi where microbial approach (EM microbes, which the Thai government is using currently to tackle their flood residues) has been applied to remediatie the site, more information you can find eg. from Heikki Tammisalo from Kirkkojärvi. Chemicals can also be used to remediate lakes, eg. to help stabilie their bottom sediments and decreace leaching (in small lakes) or they can be used (eg. CaCO) in catchment basins streams to stabilize nutrients (eg. see Pyhäjärvi area, theres an old article in Vesitalous about this). I think the most common approach is a simple physical remediation, where e.g. oxygenation is used in the lakes to make sure the lakes are well mixed and oxygenated - from this you will find numerous case examples. If you need more specific information, dont hesitate to contact me directly if you dont want to share more details publicly - Ill try to help direct you to the right direction.
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