Developing an Anthroponics Experiment

Recently I drafted a document about an Anthroponics experiment and I convinced Niklas Hjelm, from Hemmaodlat, to try it out. In this document you can find the first draft of what ratios in designing a U-Anthroponics system might look like, as well as an experiment to test these ratios. Hopefully after the experiment is completed, we will be able to issue guidelines to help everyone out there that wishes to design their own system!

Posted in Blog.


  1. Hi,

    I’d like to ask the following question regarding sterilization of urine.
    I was wondering if there is a faster method than the one waiting for a period of months in order to raise the pH.
    For water treatment there is the SODIS ( method that achieves sterilization in 6 hours sun exposure. Do you think it could be applied for urine also?


    • Hello,

      The reason why urine is kept in a sealed container is not only to sterilize it, but also to allow the urea to be converted into ammonia (NH3/NH4). The reason it takes such long time (we’re talking weeks not months though) is because the process is occurring naturally without any catalyst. In theory, one should be able to decrease this reaction time (urea to ammonia and pH to 9) to a matter of hours by adding a known catalyst to this reaction: the urease enzyme. Unfortunately, urease is a bit hard to come by, although I am planning to do a small experiment to create a homemade solution to introduce urease into a solution and test if there is a noticeable increase in reaction time. You can see all the other experiments I am planning to do on this page.

      You could just sterilize the urine and then place it directly in your reservoir, however it would still take some weeks until the urea in the urine converts into ammonia. If you are still willing to wait that much the technology you mentioned could work, though I think something like a UV-LED sterilization system would be more adequate if you can afford it.

      Best regards

  2. Thanks for the reposnse! I was also thinking for a UV lamp as an alternative. Regarding the conversion of urea to NH4/NH3, personally I wouldn’t be that worried in the sense that most people are concerned regarding how sanitary is the application of human “waste” to their garden. So if that’s ensured, a bit of waiting time for nutrient conversion wouldn’t be a problem :).
    I’ll be waiting ofr your results.

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