Fig. 3From: Scaling-up of a novel, simplified MFC stack based on a self-stratifying urine columnPolarisation and power curves of the stack comprising six MFCs connected in parallel. The resistive load values ranged from 38,000 to 4 Ω. Each resistor was connected for a period of 10 min. The volumetric power densities were obtained by normalising the power by the displacement volume of the whole reactor (250 mL)Back to article page