Abstract:Oily sludge is a major problem affecting the quality of the oilfield and its surrounding environment. The existing resource-recycling method has complex processing and high cost, and there is a risk of secondary pollution. The bioelectrochemical system can utilize oil-bearing sludge to generate electricity at the same time. A single-chamber, membrane-free deposition bioelectrochemical system supplied with oily sludge was constructed to investigate the electricity production efficiency and anodic membrane microbial variation characteristics of oil-containing sludge bioelectrochemical system. The output voltage, power density curve, polarization curve and cyclic voltammetry test were used to check the power generation performance of the system. At the same time, the biometanomic classification analysis was used to analyse the abundance and composition of microbial aggregation in the carbon felt and the initial oily sludge. The results show that the maximum output voltage and output power density of the system is 320.7mV and 3 353.7mW/m2. The anode biofilm has electrical activity, the cyclic voltammetry curve is "S" shape, and the redox peaks are at 0V and -0.5V, respectively, the limit current value is 0.12 A/cm2. The number of Seq numbers, AEC index and Chao1 mean value of the anodic film (TZ) in the stable period of the system electricity generation are lower to the initial sediment (YN1), indicating that the microbial diversity of TZ is reduced, and the difference in the composition of the two groups is obvious. The dominant flora of TZ is Proteobacteria, and the dominant flora of YN1 is Firmicutes. The bioelectrochemical system of bacteria can effectively treat oily sludge and generate electricity at the same time, which provides a new method for the utilization of oily sludge.