Department of Civil and Environmental Engineering, Southern Illinois University, Carbondale, Illinois.
Water Environ Res. 2019 Nov;91(11):1537-1545. doi: 10.1002/wer.1155. Epub 2019 Jun 19.
A two-chambered microbial fuel cell (MFC) was used for the first time for the remediation of an emerging contaminant-1,4-dioxane in its anode chamber. Groundwater historically detected 1,4-dioxane contamination was sampled from a Superfund site. Comparative study was carried out between metabolic (i.e., 1,4-dioxane as sole carbon source) and cometabolic (i.e., 1,4-dioxane and methanol as carbon sources) anodic degradations. It was found that cometabolic degradation increased 1,4-dioxane removal by 10%-52% after 7 days and increased maximum power production of the MFC by 18% to 88.9 mW/m . Oxalic acid was detected as a main metabolic degradation product. Beside oxalic acid, acetic acid and isopropanol were also detected as main products for cometabolic degradation. The presence of a biofilm for 1,4-dioxane anodic degradation was observed by a scanning electron microscopy. Phyla of Bacteroidetes, Firmicutes, and Proteobacteria, as well as a variety of species, were identified for the first time-especially Rikenella sp. and Solitalea canadensis, whose relative abundances were the highest of 18.8% and 24.0% for metabolic and cometabolic degradation, respectively. This study provided an innovative and sustainable approach for 1,4-dioxane anodic biodegradation, which would be potentially utilized for remediation of groundwater contaminated by 1,4-dioxane. PRACTITIONER POINTS: Groundwater contaminated with 1,4-dioxane was remediated in the anode chamber of a two-chambered microbial fuel cell. Cometabolic pathway increased 1,4-dioxane removal and power production of the MFC compared to metabolic pathway. The presence of a biofilm for 1,4-dioxane anodic degradation was observed, and oxalic acid was a main degradation product. This study would be potentially utilized for 1,4-dioxane-contaminated groundwater remediation with simultaneous energy production. External voltage supply for bioelectrochemical remediation of groundwater would potentially be reduced when treating chlorinated hydrocarbons co-occurred with 1,4-dioxane.
首次在双室微生物燃料电池 (MFC) 的阳极室内修复新兴污染物 1,4-二恶烷。从一个超级基金场址采集了历史上检测到含有 1,4-二恶烷污染的地下水样本。对代谢（即 1,4-二恶烷作为唯一碳源）和共代谢（即 1,4-二恶烷和甲醇作为碳源）阳极降解进行了比较研究。结果发现，共代谢降解在 7 天后将 1,4-二恶烷的去除率提高了 10%-52%，并将 MFC 的最大功率输出提高了 18%至 88.9 mW/m 。检测到草酸是主要的代谢降解产物。除草酸外，还检测到乙酸和异丙醇是共代谢降解的主要产物。通过扫描电子显微镜观察到 1,4-二恶烷阳极降解的生物膜的存在。首次鉴定了厚壁菌门、Firmicutes 和 Proteobacteria 以及多种物种，特别是 Rikenella sp. 和 Solitalea canadensis，它们的相对丰度分别为代谢和共代谢降解的最高值，分别为 18.8%和 24.0%。本研究为 1,4-二恶烷阳极生物降解提供了一种创新和可持续的方法，有望用于修复受 1,4-二恶烷污染的地下水。从业者要点：在双室微生物燃料电池的阳极室内修复受 1,4-二恶烷污染的地下水。与代谢途径相比，共代谢途径增加了 1,4-二恶烷的去除率和 MFC 的产电量。观察到 1,4-二恶烷阳极降解的生物膜的存在，草酸是主要的降解产物。本研究有望用于同时产生能量的受 1,4-二恶烷污染地下水的修复。当处理与 1,4-二恶烷共存的氯化碳氢化合物时，生物电化学修复地下水的外部电压供应可能会降低。
