This document discusses alternative energy sources and microbial fuel cells that can harvest electricity from bacteria. It notes that fossil fuels are a common but depleting energy source that also emits high levels of carbon dioxide. Alternative energy sources mentioned include solar, wind, hydroelectric, geothermal, and nuclear power. Additionally, some bacteria can produce electrons and be used in microbial fuel cells to generate electricity as another renewable energy option. The document provides an example of a commercial microbial fuel cell and experimental results showing electricity production over time from different bacterial isolates. It also lists other sources beyond soil bacteria that could potentially be used such as food waste, manure, and wastewater treatment plants.

1. Energy from Bacteria

2.  Most common energy source: fossil fuel
 Fossil fuel is depleting
 High CO2 emission
Engaging 1

3. Alternative energy:
Solar power
Marine energy
Hydroelectric
Wind energy
Geothermal
Nuclear

4. Engaging 2
 There is also microbial fuel
cell
 Harvest energy (electricity)
from bacteria
 electron producing bacteria
that live in soil

5. Example of a commercialized MFC.

6. Empower
Planning and doing experiment

8. Cathode
chamber
Anode
chamber
PVC pipe as salt
bridge
Multimeter
Crocodile-clip wires

9. V

10. Table 1 Electricity production by bacterial isolates at different hours.
Batch
Bacteria
Isolates
Voltage (mV)
1st hour 2nd hour 3rd hour 4th hour 5th hour
1 week
KS2 502 517 530 486 366
KS3 568 542 517 509 500
2 weeks
KS2 441 402 366 324 261
KS3 256 281 503 494 455

11. Enhance

12.  Other source than soil
 Food waste
 Manure
 Water treatment plant
 Bacteria culture
Extension