Optimization of Environmental Factors for MFC Treatment of Oily Sewage from Ships Based on Response Surface Methodology

Microbial fuel cell technology is used to treat oily sewage from ships, and the degradation efficiency of MFC on oily sewage from ships is mainly investigated. The BBD response surface method was used to explore the individual and their interactions with salt content, pH, and inoculum, and the mathematical model of degradation rate of OD600 and MFC on oily sewage from ships was established. The experimental results show that the order of influence of various factors on the degradation rate model is salt content > pH value > inoculation amount, and the effects of the three factors on OD600 were successively salt content > inoculum amount > pH value, and three kinds of factors affect each other, but mutual effect is not obvious, the mathematical model has good regression. The salt content is 28.85 g/L, the inoculation amount is 3.14%, and the pH value is 7.09, the predicted value of crude oil degradation rate is 82.23%, and the OD600 value is 0.752, to verify the accuracy of predicting optimal conditions, four parallel experiments were conducted, the average degradation rate was 81.37%, the average value of the bacterial solution concentration OD600 was 0.748, slightly below the forecast. Degradation rate model of the relative standard deviation is 0.74%, and that of OD600 is only 0.38%, the results show that the model was accurate to optimize the environmental conditions and predict the degradation rate of complex bacteria in the anode chamber of MFC.