Project link
http://www.sciencebuddies.org/scien...energy-microbial-fuel-cell-conductivity.shtml
Hi
We were using 2 MFCs to compare the power output after adding the salt.For the first trial we used store bought potting soil(Nature's Care Organic Potting Soil Water Conserve).
Below are the power output measurements
https://docs.google.com/spreadsheets/d/1-LaWNQnXH74rk-CtEA_eYO0wbMfMLZOkfY4BcJvNvqw/edit?usp=sharing
Below are voltage current measurements at the first day
https://docs.google.com/spreadsheets/d/1-LaWNQnXH74rk-CtEA_eYO0wbMfMLZOkfY4BcJvNvqw/edit?usp=sharing
Voltage and current after adding the salt on day 13 are
Distilled water-0.3microA
soil
1g soil-8.66mA
5g soil-36.8mA
As you can see that the power out is low,so the LEDs for both MFCs did not blink.The internal resistance was high.The temperature was not constant .It was 68-72F.
The output of 1g salt is more than 5g salt(as expected).
During the second trial we soil we used the top soil from some one's backyard.We checked with them that there was no pesticides used.
Below is the link of the power output.
https://docs.google.com/spreadsheets/d/1-LaWNQnXH74rk-CtEA_eYO0wbMfMLZOkfY4BcJvNvqw/edit?usp=sharing
Below is the voltage and current of MFCs measure each day
https://docs.google.com/spreadsheets/d/1-LaWNQnXH74rk-CtEA_eYO0wbMfMLZOkfY4BcJvNvqw/edit?usp=sharing
Below is the current and voltage measure on the first day
https://docs.google.com/spreadsheets/d/1-LaWNQnXH74rk-CtEA_eYO0wbMfMLZOkfY4BcJvNvqw/edit?usp=sharing
Voltage and current after adding salt on day 13
Distilled water-o.1mA
1g soil-3.38mA,3.21mA,3.5mA
5g soil-14.46mA,14.55mA,14.79mA
We used heat wrap to keep the temperature constant at 72F at the time of taking reading.Throughout the day, temperature was 68-72F.The LED of 1g blinked.
On the day we added salt LED blinks are as follows
Temperature- Time between blinks
71F -30
73 -18
74.5 -15
74 -12
75 -10
78 -8
The temperature was recorded each day .The second MFC's LED(5g soil) never blinked.We tried switching LEDs and chip.It worked fine for 1g,but did not work for 2nd MFC.
As you can see that the power output of 5g salt is more than 1 g soil(which is opposite to first trial).The internal resitance of 1g salt is 4700ohms.Internal resistance of 5g soil decresed to 470 then went back to 1000ohms.
Our Hypothesis was the power output of 1g is more than 5g.
We also tried using using mud watt app for our second trial,but the results were not compatible with power output readings.
2nd day-8W,4W,3W
6 day-3W
13 day-3W
12 day 8w
The point is LEDs blinks were not uniform.How do we epresent the LEDs blinks output?
Which output was expected to be more ,1g salt or 5 g salt?
What do we explain for the opposite output of 2 trials.
Why is the output of topping soil so low?
Why did the internal resistance of 2nd MFC change?
We have 3 weeks left for Science fair and almost 2months for regional Science fair?Should we do one more trial with top soil and 10g salt ?
We were thinking about using soil under river for another trial .Is it a good idea?What do we show as 3 types of soil.First was potting soil,2nd consists of clay.Does it make sense to do do third trial with river soil as it may again consists of clay with bacteria rich soil.What explanation we should give for LED of 2nd MFC not blinking .
Thankyou so much.
Waiting for your reply before the next step.
Thanks
Maliha
http://www.sciencebuddies.org/scien...energy-microbial-fuel-cell-conductivity.shtml
Hi
We were using 2 MFCs to compare the power output after adding the salt.For the first trial we used store bought potting soil(Nature's Care Organic Potting Soil Water Conserve).
Below are the power output measurements
https://docs.google.com/spreadsheets/d/1-LaWNQnXH74rk-CtEA_eYO0wbMfMLZOkfY4BcJvNvqw/edit?usp=sharing
Below are voltage current measurements at the first day
https://docs.google.com/spreadsheets/d/1-LaWNQnXH74rk-CtEA_eYO0wbMfMLZOkfY4BcJvNvqw/edit?usp=sharing
Voltage and current after adding the salt on day 13 are
Distilled water-0.3microA
soil
1g soil-8.66mA
5g soil-36.8mA
As you can see that the power out is low,so the LEDs for both MFCs did not blink.The internal resistance was high.The temperature was not constant .It was 68-72F.
The output of 1g salt is more than 5g salt(as expected).
During the second trial we soil we used the top soil from some one's backyard.We checked with them that there was no pesticides used.
Below is the link of the power output.
https://docs.google.com/spreadsheets/d/1-LaWNQnXH74rk-CtEA_eYO0wbMfMLZOkfY4BcJvNvqw/edit?usp=sharing
Below is the voltage and current of MFCs measure each day
https://docs.google.com/spreadsheets/d/1-LaWNQnXH74rk-CtEA_eYO0wbMfMLZOkfY4BcJvNvqw/edit?usp=sharing
Below is the current and voltage measure on the first day
https://docs.google.com/spreadsheets/d/1-LaWNQnXH74rk-CtEA_eYO0wbMfMLZOkfY4BcJvNvqw/edit?usp=sharing
Voltage and current after adding salt on day 13
Distilled water-o.1mA
1g soil-3.38mA,3.21mA,3.5mA
5g soil-14.46mA,14.55mA,14.79mA
We used heat wrap to keep the temperature constant at 72F at the time of taking reading.Throughout the day, temperature was 68-72F.The LED of 1g blinked.
On the day we added salt LED blinks are as follows
Temperature- Time between blinks
71F -30
73 -18
74.5 -15
74 -12
75 -10
78 -8
The temperature was recorded each day .The second MFC's LED(5g soil) never blinked.We tried switching LEDs and chip.It worked fine for 1g,but did not work for 2nd MFC.
As you can see that the power output of 5g salt is more than 1 g soil(which is opposite to first trial).The internal resitance of 1g salt is 4700ohms.Internal resistance of 5g soil decresed to 470 then went back to 1000ohms.
Our Hypothesis was the power output of 1g is more than 5g.
We also tried using using mud watt app for our second trial,but the results were not compatible with power output readings.
2nd day-8W,4W,3W
6 day-3W
13 day-3W
12 day 8w
The point is LEDs blinks were not uniform.How do we epresent the LEDs blinks output?
Which output was expected to be more ,1g salt or 5 g salt?
What do we explain for the opposite output of 2 trials.
Why is the output of topping soil so low?
Why did the internal resistance of 2nd MFC change?
We have 3 weeks left for Science fair and almost 2months for regional Science fair?Should we do one more trial with top soil and 10g salt ?
We were thinking about using soil under river for another trial .Is it a good idea?What do we show as 3 types of soil.First was potting soil,2nd consists of clay.Does it make sense to do do third trial with river soil as it may again consists of clay with bacteria rich soil.What explanation we should give for LED of 2nd MFC not blinking .
Thankyou so much.
Waiting for your reply before the next step.
Thanks
Maliha