Initialising the digital twin...
Initialising the digital twin...
Calculation Lab
Seven precise calculators, from the charge hidden in a gram of waste to the payback of a treatment plant. Move a slider and watch the physics answer.
01
Every 8 g of COD the bacteria oxidise releases one mole of electrons. That fixes the maximum charge exactly; the coulombic efficiency says how much of it reached the wire.
Where the electrons in the waste end up
F = 96,485 C/mol. 1 g COD = 1/8 mol e⁻ = 12,060.6 C. Batch CE = 32·Q / (F·4·V·ΔCOD) (Logan 2006). Growth share 1.42·Y with Y = 0.1 g VSS/g COD.
02
Acetate at the anode and oxygen at the cathode set the most voltage the cell can ever give. Temperature, pH and concentrations move the ceiling; no controller can beat it.
03
Geobacter divides only while food, warmth and pH allow it, and a small share dies every day. The biofilm settles where birth equals death, and that biomass caps the current.
04
The cell behaves like a battery with an internal resistance. Power peaks when the external load equals it; that is the point the MPPT and the AI keep hunting as the bacteria change.
05
Electroactive bacteria only eat small dissolved molecules. Solids must first be broken down, and in a one-day reactor only about 5% of them are. This is why BioVolt pre-ferments food waste.
06
A lab cell gives microwatts, a LED needs milliwatts. A supercapacitor fills slowly and empties in a burst, which is exactly how PEE POWER lit toilets and Donovan's cell ran a 2.5 W sensor.
07
Wastewater carries several times the energy a conventional plant spends cleaning it. BioVolt's honest win is not the watts it makes but the aeration it avoids.
Energy per cubic metre of wastewater