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This was just mentioned in this talk about spacecraft life support systems: https://news.ycombinator.com/item?id=25590724

I suppose you got it from there as well?

It's surprising how simple a setup this turns out to be, for creating a working bioreactor that produces oxygen.

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Also interesting on the spacecraft angle: Apparently spirulina will grow in dilute urine as a growth medium: "Attempts were made to culture Spirulina platensis in human urine directly to achieve biomass production and O2 evolution, for potential application to nutrient regeneration and air revitalization in life support system. The culture results showed that Spirulina platensis grows successfully in diluted human urine, and yields maximal biomass at urine dilution ratios of 140~240" https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1361757/

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