Figures index

From

Energy Supply with Biogas – An Example of Curricula Innovation Research in the Field of Renewable Energy

Isabel Rubner, Linda Baur, Bettina Grau, Jörg Steinbrenner, Benedikt Hülsemann

World Journal of Chemical Education. 2023, 11(3), 38-44 doi:10.12691/wjce-11-3-4
  • Figure 1. The four phases of anaerobic degradation
  • Figure 2. Three-hole stopper at the top of the biogas reactor used in a school experiment
  • Figure 3. Reactor for biogas production in a school experiment with pH monitoring
  • Figure 4. Experimental sketch of the reactor for biogas production in a school experiment with pH monitoring
  • Figure 5. Gas chromatograph used in the school experiment to generate biogas (blue line – biogas, green line – 100% hydrogen, red line – 100% carbon dioxide)
  • Figure 6. Comparative measurement by gas chromatograph of the biogas every 2 hours
  • Figure 7. Development of the pH value and total volume in biogas production with continuous pH adjustment
  • Figure 8. Quantitative evaluation of biogas after 24 days using the low-cost school gas chromatograph
  • Figure 9. pH development of variations A and E during the second run
  • Figure 10. Kinetics of biogas and methane formation in the first run, comparison of variation E with the reference HBT inoculum and duration of the methane formation lag phase (λCH4) shown as a dotted vertical line
  • Figure 11. School experiment with optimised results (day 33)