Microbial Fuel Cell Technology For Treatment Of Ship Bilge Oily Wastewater And Its Power Generation Performance

In order to meet the discharge standards for oily sewage from ships set by the International Maritime Organization(IMO),the impact of oily sewage from ships on the marine environment is reduced.In this paper,a dual-chamber microbial fuel cell(MFC)was constructed and started using ship bilge oil wastewater as anolyte.Starting from both power generation and ship bilge oil wastewater treatment,the peanut shell was investigated by preparing new peanut shell biocarbon anode materials The effect of biochar anode in MFC on the degradation efficiency of ship bilge oil and sewage and the performance of simultaneous electricity generation;explore the feasibility of using anode modification to improve the power density,output voltage and other electricity generation performance of MFC.Taking ship bilge oily sewage as the target pollutant,a composite flora was constructed and applied in the MFC anode chamber,and the response surface method was used to optimize the environmental factors in the MFC anode chamber,so as to improve the degradation efficiency of MFC on ship bilge water.The main research contents and results of the thesis are as follows:(1)Prepare peanut shell biochar,use biochar instead of traditional carbon-based material as anode,and combine with Rhodopseudomonas spp.to treat ship bilge oil sewage.The maximum output voltage of MFC of experimentally prepared biochar anode is higher than that of traditional graphite felt(GF),The MFC of carbon cloth(CC)anode is 8.89%and 16.67%higher,respectively;the maximum power density of MFC using the new type of bio-carbon anode is 2.03 and 2.55 times that of GF and CC anodes,respectively.The degradation rate of emulsified diesel oil in ship bilge oil sewage by MFC using bio-carbon anode is 85.20%,while the degradation rate of MFC using traditional GF and CC anode to ship emulsified oil is only 70.25%and 68.00%.The removal rate of chemical oxygen demand(COD)of the emulsified oil in ship bilge oil sewage by MFC using biological carbon anode is 79.89%,and the removal rate of COD for ship emulsified oil by microbial fuel cell using traditional GF and CC anode is62.16%and 60.37%.Peanut shell biochar has good adsorption performance and good biocompatibility,large specific surface area,high porosity,can promote electron transfer,effectively increase the amount of microorganisms attached to the anode surface,increase the electricity production of MFC and degrade the bilge oil and sewage of ships Rate and COD removal rate.(2)Graphene oxide/polyaniline(GO/PANI)is used to modify biochar to prepare composite anode materials to solve the problem of low electricity production performance of microbial fuel cells.The maximum power density of MFC using GO/PANI modified biochar anode reaches 2025 m W/m~2,which is 72.12%higher than that of unmodified biochar,and 3.5 and 4.39 times that of traditional GF and CC.The maximum output voltage of the GO/PANI modified bio-carbon anode is 6.12%higher than that before the unmodified,15.56%and 23.8%higher than the traditional GF and CC anodes;the experimentally prepared GO/PANI composite anode material is not only from the material and structure The two aspects have improved the anode performance of MFC at the same time,and it also has the characteristics of low cost,no pollution,etc.,and has good economic benefits and application prospects.(3)In order to further improve the degradation efficiency of MFC to ship bilge oily wastewater,a composite flora was constructed,and the response surface method was used to optimize the environmental factors of the composite flora in the anode chamber of the MFC.Under the optimal conditions,the average degradation rate is 81.37%.Compared with the predicted value,the relative standard deviation(RSD)is as low as0.74%,indicating that the model optimizes the environmental conditions and degradation rate of the composite flora in the MFC anode chamber.The forecast is more accurate.