Engineering and Energy, College of Science, Health, Engineering and Education, Murdoch University, WA 6150, Australia.
Engineering and Energy, College of Science, Health, Engineering and Education, Murdoch University, WA 6150, Australia.
Bioresour Technol. 2021 Jul;332:125137. doi: 10.1016/j.biortech.2021.125137. Epub 2021 Apr 6.
A novel microbial-electrochemical filter was designed and operated based on a combined microbial electrolysis cell and bio-trickling filter principles with the aim to maximize gas-liquid mass-transfer efficiency and minimize costs associated with bubbling biogas through liquid-filled reactor. CO/biogas feed to the MEF was done via a computer-feedback pH control strategy, linking CO feed directly to the OH production. As a result current efficiency was constant at around 100% throughout the period of experiments. CO from biogas was almost completely removed at cathodic pH setpoint of 8.5. Maximum CO removal rate was 14.6 L/L/day (equivalent to 29.2 L biogas/L/day). Net energy consumption was around 1.28 kWh/NmCO or 0.64 kWh/m biogas (maximum 49% energy efficiency). An ability to maintain a constant pH means elevated pH from increasing applied potential (current) is no longer an issue. The process can potentially be up-scaled and operated at a much higher current and therefore CO removal rate.
设计并运行了一种新型微生物电化学过滤器，该过滤器基于微生物电解池和生物滴滤池原理，旨在最大限度地提高气液传质效率，并最大限度地降低通过充满液体的反应器鼓泡沼气的相关成本。通过计算机反馈 pH 控制策略将 CO/沼气进料输送到 MEF，将 CO 进料直接与 OH 生产联系起来。结果，在整个实验期间，电流效率始终保持在 100%左右。在阴极 pH 设置为 8.5 时，沼气中的 CO 几乎被完全去除。最大 CO 去除率为 14.6 L/L/天（相当于 29.2 L 沼气/L/天）。净能耗约为 1.28 kWh/NmCO 或 0.64 kWh/m 沼气（最大 49%的能源效率）。能够保持恒定的 pH 值意味着增加施加的电势（电流）不会导致 pH 值升高，这不再是一个问题。该过程可以潜在地进行放大，并以更高的电流和因此更高的 CO 去除率运行。
