Novel Technique For Energy Generation Coupled With Treatment Of Wastewater And Resource Recovery Using E-waste As Electrode Material In Microbial Fuel Cell
Project Description :

Electrode materials play a crucial role to generate utmost number of electron from the anodic chamber in microbial fuel cells (mfcs), which uses bacteria as the catalysts to uptake electron from the organic waste. commercially available electrode materials for mfcs are quite expensive and not suitable for large scale application. this study demonstrates the use of liquid crystal coated polaroid glass electrode (lcpge) material collected from disposed liquid-crystal display (lcd) computer monitor as anode and cathode electrodes. fourier transform infrared spectrum confirms the presence of nh2, c≡n, c=o and o-c and/or c-o-c functional groups in lcpge. functional groups present in lcpge lead to an excellent electrochemical performance with three distinct oxidation and reduction peaks as observed in cyclic voltammetry at the scan rate of 100 mvs−1. furthermore, lcpge exhibits an excellent cycling stability and a high degree of reversibility and only a < 10% deviation between first and the 100th cycle. specially designed dual chambered mfc was used for the simultaneous removal of organics from sewage wastewater (250 mg/l), reduction of hexavalent chromium (cr 6) and recovery of cr 3 from synthetic electroplating wastewater. anaerobic condition was maintained in anodic chamber by periodic purging of nitrogen and lcpge electrode of 10.5 cm2 was used as anode. a confocal fluoresce microscopic (cfm) image shows that bacteria in anodic chamber were readily attached to the surface of lcpge within 24 h. such a trend was not observed and/or reported with a conventional carbon cloth electrode. in the cathode chamber, synthetically prepared cr 6 (100 mg/l) was used as the electron acceptor. at the cathode lcpge (10.5 cm2) interface, toxic cr 6 ions readily accepted electrons and formed nontoxic cr 3. the maximum power density of 700 mw/m2 (40 ma/m2) was achieved by adding organic waste and cr 6 wastewater in anodic and cathodic chamber, respectively. the power production achieved in this study was much comparable when compared to conventional carbon cloth electrode with power density of 767 mw/m2 (2 ma/m2). in anodic chamber 78.32% of organic waste was removed within 48 h of operation. similarly, in cathode chamber 100% reduction was achieved within 2 days of operation forming stable nontoxic cr2o3 as confirmed by the x-ray diffraction and x-ray photoelectron spectroscopy analysis. during the reduction process, functional groups present in the lcpge strongly attract cr 6 ions and converts it into non-toxic cr(oh)3 on the cathode surface (confirmed by cfm). furthermore cr(oh)3 is converted into stable cr2o3 and deposited at the bottom of the cathode chamber. the recovered cr2o3 can be reused as a raw material for tanneries, electroplating industries and other applications. this work is the first of its kind where simultaneous removal/recovery of organic waste / cr 6 containing electroplating wastewater and energy production using disposed lcd computer monitor as the electrode materials.

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Project Details :
  • Date : Dec 29,2014
  • Innovator : Praveena Gangadharan
  • Team Members : Dr.Indumathi M Nambi, Dr.Jaganathan Senthilnathan
  • Guide Name : Dr. Indumathi M Nambi
  • College : Indian Institute of Technology Madras,India
  • Submission Year : 2015
  • Category : Environmental Engineering
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