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michka:research:microbial_fuel_cells:marseille3 [2014-10-03 12:25] – michkamichka:research:microbial_fuel_cells:marseille3 [2014-10-08 14:39] (current) – michka
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 ====Experiment "Marseille3"==== ====Experiment "Marseille3"====
 +
 +These experiments have been conducted during the open workshops of the [[http://reso-nance.org/whattheflok/accueil|What the Flok ?]] festival taking place in Marseille, from Septembre 29th to October 4th.
  
 ====Crate Design #1==== ====Crate Design #1====
  
-Design features: +__Design features__ 
-   * **Substrate**: topsoil gathered from La Friche's garden - two days before assembly - inoculated with 10 mL of clay gathered in Niolon on the day of assembly.+ 
 +{{ :michka:research:microbial_fuel_cells:dscf6377.jpg?300 |Clay Sampling Location - Niolon, France}} 
 +//Clay sampling spot - Niolon, France.// 
 + 
 + 
 +   * **Substrate**: topsoil gathered from La Friche's garden - two days before assembly - inoculated with 10 mL of clay gathered in Niolon (picture above) on the day of assembly.
      * Volume: 80*30*2 cm3      * Volume: 80*30*2 cm3
    * **Container**: crate, covered with a transparent garbage plastic bag.    * **Container**: crate, covered with a transparent garbage plastic bag.
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      * Surface: 70*5 cm2      * Surface: 70*5 cm2
  
-Performances:+__Performances__ 
    * **Voltage**: started at 30mV, went up avove 40, and dropped down to 0 in 2 hours.    * **Voltage**: started at 30mV, went up avove 40, and dropped down to 0 in 2 hours.
    * **Current**: started at 0.125 mA, and dropped down to 0 in 2 hours.    * **Current**: started at 0.125 mA, and dropped down to 0 in 2 hours.
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 ====Crate Design #2==== ====Crate Design #2====
  
 +__Design features__
  
-Design features: 
    * **Substrate**: mud gathered from La Friche's garden on the day of assembly.    * **Substrate**: mud gathered from La Friche's garden on the day of assembly.
      * Volume: 80*30*2 cm3      * Volume: 80*30*2 cm3
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      * Surface: 70*5 cm2      * Surface: 70*5 cm2
  
-Performances: +__Performances__ 
-   * **Voltage**: started at 5mV, went up avove 45 the second day.+ 
 +Performances on Day0: 
 +   * **Voltage**: around 5 mV.
    * **Current**: around 0.1 mA.    * **Current**: around 0.1 mA.
  
-**Max Power Measured**: 0.5 microW+Performances on Day1: 
 +   * **Voltage**: around 45 mV. 
 +   * **Current**: around 0.1 mA. 
 + 
 +Performances on Day2: 
 +   * **Voltage**: around 130 mV peak. 
 +   * **Current**: around 0.5 mA peak. 
 +   * Strange measurement behavior:  
 +     * Voltage starts at 80 mV, and builds up to 130 mV in about 15 minutes. 
 +     * Current starts at 0.7mA and drops to 0.3mA in about 15 minutes too. 
 + 
 +Performances on Day3: 
 +   * **Voltage**: around 250 mV, stable. 
 +   * **Current**: around 1.5 mA peak, decreasing slowly, stabilized around 0.60 mA. 
 + 
 +Performances on Day4: 
 +   * **Voltage**: around 350mV, stable. 
 +   * **Current**: around 1 mA. 
 + 
 +**Peak Power Measured**: 375 microW. 
 + 
 +**Max (stable) Power Measured**: around 350 microW. 
 + 
 +====Pile Microbienne Marseillaise==== 
 + 
 +{{ :michka:research:microbial_fuel_cells:dscf6391.jpg?300 |}} 
 + 
 +__Design features__ 
 + 
 +{{ :michka:research:microbial_fuel_cells:dscf6389.jpg?300 |}} 
 +//Marine sediments sampling spot - Marseille, France// 
 + 
 + 
 +   * **Substrate**: sea sediments gathered ten meters from the Catalan beach in Marseille on the day of assembly. 
 +     * Volume: 0.5L 
 +   * **Container**: 2L plastic bottle. 
 +   * **Proton Exchange Membrane**: a piece of cardboard. 
 +     * Surface: the bottle's section (diameter of 6-8 cm). 
 +   * **Water**: seewater. 
 +   * **Anode**: copper covered with carbon, extracted from a dead DELL PC battery found in the LFO storage space. 
 +     * Surface: 50*5 cm2 
 +   * **Cathode**: copper covered with less carbon, scrap from the [[michka:research:supercapacitors|supercapacitors]] experiment. 
 +     * Surface: 20*5 cm2 
 + 
 +__Performances__ 
 + 
 +Performances on Day0: 
 +   * **Voltage**: about 13mV 
 +   * **Current**: about 0.1 mA 
 + 
 +Performances on Day1: 
 +   * **Voltage**: about 110mV 
 +     * **Current**: starting at 7 mA ! And dropping slowly 
 + 
 +**Peak Power Measured**: 770 microW 
 + 
 +__Observations__ 
 + 
 +Even though the multimeter was connected the wrong way (+ on anode, - on cathode), we first had positive (and quite high) current and voltage value. Is this due to remanant charges from the PC battery ? 
 + 
 +==Conclusion== 
 + 
 +From both these expriments and those conducted in Bruxelles, we can conclude that the MFC behavior improves and stabilizes with time. 
 + 
 +As the "pile micrboienne marseillaise" increases its performance way quicker than the "Crate Design #2" It seems that a better mcirobial & nutrient source induces quicker results. 
 + 
 +Using newspaper or cardboard as a Proton Exchange Membrane seems fine. 
 + 
 +New long-term experiments should be conducted to test other parameters, including more broadly available electrode materials.

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