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The Sensor in a Wastewater Tree Plant
The sensor is an anode cathode pair fuel cell architecture. In theory, if you applied in a voltage, you'd be producing hydrogen on the cathode. But if you apply small voltages, you can convince or trick the bacteria into forming films on those surfaces. The bacteria form a biological catalyst and actually catalyzes the flow of electrons. It's roughly the size of, I don't know, it's like a curling iron or something right?