More info needed.
Specifically, does it generate more energy than I take out of my smartphones battery when going for a 'visit'?
Dr Ioannis Ieropoulos and colleagues from the University of the West of England's Bristol outpost and the Bristol Robotics Laboratory have claimed a world's first: powering a mobile phone with human urine. Detailed in the paper Waste to Real Energy: the first MFC powered mobile phone in the journal Physical Chemistry Chemical …
Urine is 95% water
Therefore it is ~5% 'food'
Let food have an average calorific density of 3 calories per millilitre.
The average daily urination volume is 1500 ml.
5% of 1500 is 75. Multiplying by 3 gives us 225 calories in a day's urine.
That's roughly 10% of our dietary needs.
Saving 10% off our total energy bill related to getting food from field to stomach.
Which is massive compared to the amount of energy we can probably extract from waste urine using MFCs.
Two pieces of advice:
1. Drink urine
2. Never admit it
The author does not drink has own urine.
I suspect that you have over-estimated the calorific content of a day's urine. The presence of nutrients such as sugars and proteins in the urine is normally a symptom of illness, so presumably the 5% should be mostly urea.
It's also not clear whether you're talking calories (i.e. energy to boil a cc of water), or Calories (used in dietary calculations, but strictly kilocalories).
Biologists don't do The Register, but if they did, they'd surely point out that there is no evidence in the animal kingdom of the use of urine as a source of calories where calories are scarce while there is plenty of evidence in of the use of urine as a source or water when that's scarce (another option is to excrete a urea paste and hold onto your water like many desert lizards do).
calories with a small c would be closer the mark. 0.225 calories per day's urine - about the same calories you'd find in 2/3 of a sunflower seed.
Would you bother with a sunflower seed if it was the size of a 4-pint bottle yet had the same calories as 1 and a third sunflower seeds?
It's no joke. I have a friend who went insane because of that confusion over calories vs kilocalories.
How does this compare to peeing on a micro turbine/propelling a dynamo? Or extracting energy from the heat of sewage?
Not that any of these would exclude the use of MFCs or each other. I'm only wondering where the highest potential is and hence worth exploiting.
(Beer icon as beer would probably be a major source of energy in this regard.)
Biting the hand that feeds IT © 1998–2019