بررسي آزمايشگاهي پارامترهاي موثر برعملكرد يك پيل سوختي ميكروبي تك محفظه اي به منظور تصفيه پساب لبني در ساختار حلقوي

چكيده انگليسي :

Experimental Investigation of Effective Parameters in a Single Chamber Microbial Fuel Cell with Annular Configuration for Dairy Wastewater Treatment Mohammad Mahdi Mardanpour mm mardanpour@ce iut ac ir Date of Submission 2012 01 16 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language PersianSupervisors name Mohsen Nasr Esfahany mnasr@cc iut ac ir Tayebeh Behzad tbehzad@cc iut ac irAbstractThis study reports on the fabrication of a novel single chamber microbial fuel cell MFC configuration The single chamber MFC with annular configuration and spiral anode geometry is suggested for futurelarge scale applications There were two main objectives in this study First the stainless steel mesh anodewith graphite coated as a porous surface for biofilm growing in annular single chamber MFC configurationwere designed and its characteristics were investigated Second the power generation and internalresistance of the annular MFC with spiral anode geometry was compared to conventional air cathode MFCsto elucidate the effects of this configuration on MFC performance Dairy wastewater which containscomplex organic matter was used as substrate which has a very low power generation in conventionalMFCs In this study the maximum power density of 20 2 W m3 was obtained MFC performance as powergenerator was characterized based on polarization behavior and cell potentials In addition significantreduction in wastewater turbidity and chemical oxygen demand 83 5 and 91 respectively wereobserved after treatment in the MFC Effects of varying electrode surface area and dairy wastewaterconcentration were investigated With decreasing anode surface area from 2u63 cm to 2u38 cm outputcurrent was reduced about 34 Also the MFC with the smaller anode surface area has a much longerstationary phase than that with the larger anode surface area and stationary phase period is increased from23 hours to 67 hours Anode geometry and its configuration in the MFC affect specific area and electrodesspacing The higher specific area and lower space with cathode increase MFC efficiency Clearly withreducing anode surface area biofilm development decelerated compared to greater anode surface area Thisled to reduction of substrate degradation Moreover by decreasing anode surface area in spiral geometry electrode spacing is increased that led to increase in internal resistance of the cell By increasing MFCresistance including external and internal resistances the duration of stationary phase increased Thewastewater concentration is an important parameter on MFCs performance By reduction of initial dairywastewater COD which was fed to annular single chamber MFC from 1000 to 500 mg lit maximum outputcurrent was decreased from 1 89 to 1 2 mA In addition the MFC which was fed with wastewater withCOD 500 mg lit had a shorter descending phase than that of the higher wastewater COD Moreover theoutput current from the MFC fed with dairy wastewater with less COD reached 0 17 mA after 49 hourswhile the period of current reduction for the MFC fed with dairy wastewater with higher COD is longerthan 72 hours With decreasing dairy wastewater concentration output current is reduced due to reductionof organic contents in the anolyte The SEM pictures of stainless steel mesh with graphite coating beforeand after biofilm formation demonstrated a good bacterial adhesion on the spiral anode Due to the highsurface area large amount of biomass attached to treated stainless steel mesh Therefore the porosity ofanode can be a suitable place for biofilm formation Morphology of biofilm was uniform which facilitatedthe electron generation and transfer Keywords Single chamber microbial fuel cell effective parameters annular configuration spiralanode geometry dairy wastewater

مردان پور، محمد مهدي

بررسي آزمايشگاهي پارامترهاي موثر برعملكرد يك پيل سوختي ميكروبي تك محفظه اي به منظور تصفيه پساب لبني در ساختار حلقوي

آند حلزوني شكل