Australian Maritime College, College of Sciences and Engineering, University of Tasmania, Launceston 7248, Australia.
Environment and Sustainability Department, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, India.
Sci Total Environ. 2020 Jan 1;698:134248. doi: 10.1016/j.scitotenv.2019.134248. Epub 2019 Sep 2.
This study provides a new approach of electrode dependent anaerobic ammonium oxidation (electroanammox) in microbial fuel cell (MFC) integrated hybrid constructed wetlands (CWs). The study was carried out in three CWs, each with a horizontal flow (HF) followed by a vertical upflow (VUF). Two of the CWs were integrated with MFC, one was operated in closed circuit (CL) mode and the other in open circuit (OP) mode to determine the influence of electron transfer through an external electrical circuit. The initial nitrogen and carbon concentration were 40 mg/l and 880 mg/l respectively. The total nitrogen (TN), NH-N, TOC and COD removal achieved in CW-MFC-CL were 90.0 ± 1.15%, 94.4 ± 0.75%, 64.8 ± 3.0% and up to 99.5 ± 3.4%, respectively. The TN and NH-N removal in CW-MFC-CL was 20.0% and 13.6% higher than normal CW. Maximum current density achieved in CW-MFC-HF was of 75 mA/m and in CW-MFC-VUF was 156 mA/m. Furthermore, the study revealed that even at low microbiological biomass, an MFC integrated CW operating in closed circuit gave higher removal of NH-N and COD than the normal CW and open circuit CW-MFC. Microbiological analysis shows the presence of already known nitrifier and denitrifer which indicates their role in electrode dependent nitrogen removal.
本研究提供了一种在微生物燃料电池（MFC）集成混合湿地（CW）中依赖电极的厌氧氨氧化（电氨氧化）的新方法。该研究在三个 CW 中进行，每个 CW 都采用水平流（HF） followed 垂直上流式（VUF）。其中两个 CW 与 MFC 集成，一个以闭路（CL）模式运行，另一个以开路（OP）模式运行，以确定通过外部电路传递电子的影响。初始氮和碳浓度分别为 40mg/L 和 880mg/L。CW-MFC-CL 中的总氮（TN）、NH-N、TOC 和 COD 去除率分别达到 90.0±1.15%、94.4±0.75%、64.8±3.0%和高达 99.5±3.4%。CW-MFC-CL 中的 TN 和 NH-N 去除率比普通 CW 高 20.0%和 13.6%。CW-MFC-HF 中的最大电流密度为 75mA/m，CW-MFC-VUF 中的最大电流密度为 156mA/m。此外，该研究表明，即使在微生物生物量较低的情况下，闭路运行的 MFC 集成 CW 对 NH-N 和 COD 的去除率也高于普通 CW 和开路运行的 CW-MFC。微生物分析表明存在已知的硝化菌和反硝化菌，这表明它们在电极依赖氮去除中的作用。
