A single-medium membrane-less sediment microbial fuel cell (SMFC) was developed to remove Cr⁶⁺ from sediment by embedding its cathode and anode in the sediment, so that the electrons that are generated by the degradation of organic matter at the anode are received by Cr⁶⁺ at the cathode, reducing the competition for oxygen. The best power density and Cr⁶⁺ removal efficiency of the SMFC were found to be 8.8 mW/m³ and 60.9 %, respectively, for a system in a high Cr⁶⁺ concentration (600 mg/kg). Biochar has a high specific surface area and adsorption capacity, facilitating electron transfer. As an electron mediator, peanut husk biochar that was sintered at 800 °C had an electron transfer capacity of 0.295 mmol e⁻/g biochar. This biochar was added to the SMFC system to improve its performance by exploiting the electron transfer ability of the biochar, increasing the electricity production and Cr⁶⁺ removal efficiency of the SMFC. The power density and Cr⁶⁺ removal efficiency of the biochar-added system were 55.1 mW/m³ and 97.74 %, or 6.26 times and 1.6 times those of the system without biochar, respectively, indicating the improvement that is provided by adding biochar.

开发了一种单介质无膜沉积物微生物燃料电池（SMFC），通过将其阴极和阳极嵌入沉积物中来去除沉积物中的 Cr ⁶⁺，从而使阳极有机物降解产生的电子成为Cr ⁶⁺在阴极接收，减少了对氧的竞争。^{对于高 Cr 6+}浓度 (600 mg/kg) 的系统，SMFC 的最佳功率密度和 Cr ^{6+去除效率分别为 8.8 mW/m 3和 60.9 %。}生物炭具有高比表面积和吸附能力，有利于电子转移。作为电子介体，在 800 °C 下烧结的花生壳生物炭具有 0.295 mmol e 的电子转移能力⁻ /g 生物炭。将该生物炭添加到 SMFC 系统中，通过利用生物炭的电子转移能力、提高SMFC 的发电量和 Cr ^{6+去除效率来提高其性能。}添加生物炭的系统的功率密度和 Cr ^{6+去除效率分别为 55.1 mW/m 3}和 97.74 %，分别是不添加生物炭的系统的 6.26 倍和 1.6 倍，表明添加生物炭带来的改善。