Algae

• Vinay says this is a promising technology - [1]
• Small scale spirulina productin from Mr. Jourdan in France? - [2]
• Other small-scale examples are in Auroville, India, which is very likely the world's longest-running Spirulina operation
• Then there is another Indian small-scale example in Madurai (video here) - 150 g/day/20 square meters
• Some successful village-scale examples in West Africa. But all of these are rather labor intensive.
• Gunter Pauli and ZERI did an interesting integration project in Namibia: Spirulina and BEER ! That's my favorate IWFMS. Basically: Brewery wastewater is highly alkaline, is used for growing spirulina (eliminates cost for chemicals, takes harmful alkaline wastewater out of the waste stream), spent grains from brewery barley are first used to grow mushrooms, then leftovers are put in biogas tank. Biogas powers brewery. It's ingeniuous.

There is one patent about growing your own Spirulina at home in a photobioreactor. In terms of contamination, that doesn't seem to be such an issue with Spirulina because of the highly alkaline pH, nothing much else will grow at pH 10.5.