Rockets for Water Treatment ?

Now two Stanford University engineers are developing a new sewage treatment process that would actually increase the production of two greenhouse gases – nitrous oxide (aka "laughing gas") and methane – and use the gases to power the treatment plant.
"Normally, we want to discourage these gases from forming," said Craig Criddle, a professor of civil and environmental engineering and senior fellow at the Woods Institute for the Environment at Stanford. "But by encouraging the formation of nitrous oxide, we can remove harmful nitrogen from the water and simultaneously increase methane production for use as fuel."

Read the whole article here :

http://news.stanford.edu/news/2010/july/waste-072610.html