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| michka:research:microbial_fuel_cells:bruxelles2 [2014-09-26 10:01] – michka | michka:research:microbial_fuel_cells:bruxelles2 [2014-10-09 22:02] (current) – 148.122.12.234 | ||
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| ====Experiment " | ====Experiment " | ||
| - | ===Salt Bridges=== | + | {{ : |
| - | I failed a three batches of [[http:// | + | ===Salt Bridges=== |
| - | ===The right protocol=== | + | I tried three batches of [[http:// |
| + | The right protocol: | ||
| * Mix 200 ml water, 5 g of agar and 75g of salt in a cooking pan. | * Mix 200 ml water, 5 g of agar and 75g of salt in a cooking pan. | ||
| * Bring it to a boil while mixing regularly. | * Bring it to a boil while mixing regularly. | ||
| Line 16: | Line 17: | ||
| * Place them in the fridge for a few hours | * Place them in the fridge for a few hours | ||
| - | ===What not to do=== | + | What not to do: |
| * Use hot water from a kettle and mix everything in a cold pot | * Use hot water from a kettle and mix everything in a cold pot | ||
| * This induces a very uneven mix, where salt and agar are not well dissolved | * This induces a very uneven mix, where salt and agar are not well dissolved | ||
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| ===Mud, Tall=== | ===Mud, Tall=== | ||
| + | |||
| + | {{ : | ||
| + | //Mud samping location - Sint-Jans-Molenbeek, | ||
| + | |||
| Design details: | Design details: | ||
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| * Current is in the 1-2mA range. | * Current is in the 1-2mA range. | ||
| * Power is therefore in the mW range. | * Power is therefore in the mW range. | ||
| + | |||
| + | Longer-term results (12 days & more): | ||
| + | * Tension is stable at 110 mV, but drops when measuring current (and rises up afterwards). | ||
| + | * Current is stable at 107 microA, but drops after measuring tension (and rises up afterwards). | ||
| + | * Overall power is therefore around 11 mW. | ||
| ===Mud, Small=== | ===Mud, Small=== | ||
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| * Current is sensitive to oxygen presence, and is very low - about 0.3 mV when activated, dropping to 0.1 mV at rest. | * Current is sensitive to oxygen presence, and is very low - about 0.3 mV when activated, dropping to 0.1 mV at rest. | ||
| * Power is therefore in the microW range. | * Power is therefore in the microW range. | ||
| + | |||
| + | Longer-term results (12 days & more): | ||
| + | * Tension is stable at 20 mV. | ||
| + | * Current is stable at 1 microA. | ||
| + | * Overall power is therefore around 20 microW. | ||
| ===Vegetable Waste & Compost Tea=== | ===Vegetable Waste & Compost Tea=== | ||
| + | |||
| + | {{ : | ||
| Design details: | Design details: | ||
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| * Current is sensitive to oxygen presence, and is very low - about 0.4 mV when activated, dropping to 0.1 mV at rest. | * Current is sensitive to oxygen presence, and is very low - about 0.4 mV when activated, dropping to 0.1 mV at rest. | ||
| * Power is therefore in the microW range. | * Power is therefore in the microW range. | ||
| + | |||
| + | Longer-term results (12 days & more): | ||
| + | * Tension is stable at 120 mV. | ||
| + | * Current is stable at 135 microA. | ||
| + | * Overall power is therefore around 16 mW. | ||
| + | |||
| + | ===Conclusion=== | ||
| + | |||
| + | * Electrode surface area seems an important feature. | ||
| + | * Most of the mud in the Tall-Mud design has been sitting here for a week, which may have an influence on community development. | ||
| + | * Considering electrode area and overall volume, the compost tea design seems very productive. | ||
| + | |||
| + | ===Further Designs=== | ||
| + | * Scale-up the vegetable+compost tea design. | ||
| + | * Look for carbon electrodes, which seem more appropriate | ||
| + | * Replace salt bridge with paper | ||
| + | |||
| + | {{ : | ||