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Qi Feng, Longjun Xu, Chenglun Liu, Yu Hao +4
This study investigates bioelectricity generation from oil-based drill sludge (OBDS) treatment in a two-chamber microbial fuel cell by optimizing stirring rate (SR) and supplementing oil-based drill cuttings (OBDCs). Maximum power density of 671 mW/m² was achieved at 100 r/min SR and 2 g/L OBDCs concentration, representing 2.4× improvement over control. High removal efficiencies were obtained for COD (52.3%), ammonia (74.5%), and total inorganic nitrogen (58.9%). Electrochemical and microbial community analyses revealed that SR and OBDCs synergistically enriched electrogenic bacteria and reduced overpotential losses.
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Abstract This was the first attempt to investigate the bioelectricity output based on solid-liquid cooperation in the microbial fuel cell (MFC) treatment of oil-based drill sludge by adjusting the stirring rate (SR) and supplementing oil-based drill cuttings (OBDCs). According to the results, the maximum power density output reached 671 mW/m 2 (5.4 kW h/m 2 ) when the stirring rate was 100 r/min and the OBDCs concentration was 2 g/L in the anode chamber, which was more than 2.4 times as high as that of the control group and significantly higher than those of other MFCs. Extremely high removal efficiencies of chemical oxygen demand (COD), ammonia and total inorganic nitrogen (TIN) were realized in optimization, with values of 52.3 ± 1.9% (the removal quality was 12081 ± 432 mg/L), 74.5 ± 0.2% and 58.9 ± 0.2%, respectively. Electrochemical analyses and high-throughput sequencing revealed that the cooperation of stir with OBDCs could activate microbial activity while reducing the overpotential loss in anode systems and thus responsible for the enrichment of electrogenic bacteria with extracellular electron transfer functions (such as Proteobacteria , Bacteroidetes and Actinobacteria ) and denitrifying bacteria (such as Bacilli and Anaeroli neae and Rhodopseudomonas ). Moreover, substrate characterization (via Fourier-transform infrared spectrometry (FT-IR) and X-ray diffraction (XRD)) showed that organic matter might converted into small molecules without intermediates. This investigation offers a new strategy for the treatment /application of solid and liquid produced from oil and gas fields by bioelectrochemical technology.