Fig. 7
From: Scaling-up of a novel, simplified MFC stack based on a self-stratifying urine column
Vertical profiles, within the M5–11 stack, of electroconductivity and of ammonium concentrations. The 0 mm depth indicates urine level. Green and Red circles are two different stratification periods. Green circles show the median of triplicates and error bars indicate the lowest and highest measured values. Red circles are single data points. The hours shown, indicate the time spent between the last feed and the ammonium analysis