Total Faecal Solution, The Technocrat, 2003

In the Biogas Installation, faeces are pumped to the first tank or digester, where the temperature is kept at 37 °C. The mass is stirred, and the acidity of the liquid is maintained. Methane gas forms through the influence of bacteria in the first digester. After 21 days the liquid moves to the second digester to recuperate the last traces of biogas. After that, it goes into the large horizontal tank, a septic tank with an aerator that pumps oxygen through the liquid to improve purification. The next step is the green filter: the filter removes the last impurities and produces quality drinking water, which is connected and transferred to the Water Tower. The biogas collects in barrels next to the tanks where it is dried and washed. There is safety equipment in case of overpressure or if the system backfires.