You will assemble two microbial fuel cells that each contain a different type of soil. Throughout the experiment you will monitor their power outputs and then compare which soil produces the most electricity. Which soil do you think will work best? 1. First, watch the videoor follow the step-by-step instructions to see how.
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How to Make a Microbial Fuel Cell (MFC) Using Mud: The MudWatt microbial fuel cell (affectionately dubbed the "Dirt Battery") is a device that uses bacteria to convert the organic matter found in mud into electricity. This Instructable will
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In this science fair project, build a microbial fuel cell and use it to power an external circuit. The student will also use the microbial fuel cell to harvest electricity from two different mud samples.
When packing the mud in the microbial fuel cell, pat down the mud and electrodes, as described in the Setting Up the Microbial Fuel Cells section of the Procedure, so that you do not have any trapped air bubbles in the mud.
To generate electricity from dirt, first you need some kind of jar with a piece of graphite or other non-corrosive metal at the bottom. Then, add dirt with very little oxygen and another piece of graphite. Soil microbes are constantly making electrons, but if there’s oxygen present, they’ll put the electrons into the oxygen instead. By limiting the oxygen, the electrons are forced to travel through an external circuit, generating electricity.
When you place a zinc anode and a copper cathode in a container of wet mud, the two metals start reacting, because zinc loses electrons easier than copper and because the mud contains ions. By wetting the dirt, it turns into a true electrolyte solution. Therefore, the electrodes start exchanging electrons, just like an ordinary battery does.
Even in these crude experiments, the current was enough to power a small calculator, the scientists report. After several weeks, the researchers identified the microbes that were growing on the mud-implanted electrodes.
Add distilled water and mix it in until your topsoil mud feels like cookie dough. Add more water if the mud is too crumbly, or add more topsoil if the mixture feels too wet. When you have prepared your soil mud, set it aside and wash your hands. Carefully take the MFC pieces out of the box and lay them out.
Since working with wastewater samples can be challenging, you will use a mud sample. The mud sample will be from a local lower order stream or creek. A lower order stream is one that is formed by the joining of other streams. So a first-order stream is one that does not have any other streams feeding into it.
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