Study On The Performance Of Landfill Leachate For Osmosis Microbial Fuel Cell

This project uses FO(forward osmosis)new membrane technology to integratemicrobial fuel cell(MFC)to simulate landfill leachate,systematically study the type and concentration of draw solutions,and anolyte temperature for positive-permeability on the Osmosis Microbial Fuel Cell(OsMFC)power generation and the effect of the pollution effect.In this study,we first constructed a H-type OsMFC battery that simulates landfill leachate as the anode raw material liquid and silver nitrate as the draw solution,and runs stably.Secondly,the parallel drawing draw solutions are silver nitrate,sodium chloride and potassium ferricyanide.OsMFC;Then,the OsMFC with the concentration of the draw solutions of 0.5 mol/L,1.0 mol/L and 1.5 mol/L were constructed in parallel;then,the temperature of the parallel anode electrode was 10±2°C,20±2°C and 35±2°C,respectively OsMFC;the electrical performance and sewage treatment effect of each device were investigated,and the water samples,carbon felt and membrane changes in the experimental device were compared and analyzed.Finally,high-throughput sequencing was used to analyze the microbial community structure of the OsMFC anode chamber.The study yielded:(1)OsMFC device has relatively stable operation performanceand higher power generation than MFC device.At the same time,the experimental indicators also indicate that the infiltration microbial fuel cell started successfully;(2)OsMFC with silver nitrate as the draw solution has the highest electricity generation,power density,polarization curve and COD removal rate,followed by sodium chloride and potassium ferricyanide.The maximum power density is up to 60.03 mW/m~2,the corresponding output voltage is 490 mV,and the COD removal rate is about 73.66%;(3)The electricity production and power density of the OsMFC device with 1.5 mol/L silver nitrate concentration as the draw solution.The polarization curves and COD removal rates were the highest,followed by sodium chloride and potassium ferricyanide.The maximum power density is up to 55.13mW/m~2,the corresponding output voltage is 525 mV and the COD removal rate are about75.61%and 63.25%;(4)The anode chamber electrode liquid temperature is controlled to35°C±2°C.The OsMFC produced electricity,power density and polarization curves and COD removal rates were the highest,20°C±2°C followed by 10°C±2°C minimum.The highest voltage and power density can reach 580 mV and 67.28 mW/m~2,COD removal rate is about81.41%;(5)UV absorption spectrum shows that it is operated by OsMFC device to simulate landfill leachate.The macromolecular material has been converted into a small molecular substance which is easily degraded;the comparison between the carbon felt and the blank carbon felt at the end of the operation indicates that the anode microbial acclimation of the OsMFC battery is successful,and the running performance is basically stable;(6)In the OsMFC with landfill leachate as the raw material liquid and silver nitrate as the draw solution,there are 8 kinds of dominant bacteria producing power,among which unclassified_g_Comamonas is the main dominant species and unclassified_g_Tessaracoccus,unclassified_g_Lactococcus,uncultured_bacterium_g_norank_p_Saccharibacteria,unclassified_f_Comamonadaceae,uncultured_bacterium_g_Sinomonasand uncultured_bacterium_g_Nakamurella are unknown bacteria.Studies have shown that it is feasible to construct a H-type positive osmoticmicrobial fuel cell(OsMFC)with landfill leachate as the substrate.The anodic liquid temperature was controlled at 35°C±2°C,and the energy production performance and sewage treatment efficiency of OsMFC with 1.5 mol/L silver nitrate as the draw solution was the best.In the OsMFC where the leachate is used as the anode raw material liquid,unclassified_g_Comamonas is the main dominant species.