Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou, 510006, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, 511458, China.
Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou, 510006, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, 511458, China.
Environ Res. 2022 Mar;204(Pt A):111972. doi: 10.1016/j.envres.2021.111972. Epub 2021 Sep 4.
Anaerobic ammonium oxidation coupled with Fe(III) reduction (Feammox) is an autotrophic biological nitrogen removal (BNR) technique in treating low-C/N wastewater. However, the nitrogen removal rate of Feammox is limited by the extracellular electron transfer. In this study, wood activated carbon (AC) was chosen as electron shuttle to enhance the start-up of the Feammox process. Within an operational period of 150 days, the NH-N removal efficiency reached 97.9-99.5% with a volumetric loading rate (VLR) of 0.04-0.06 kg N m d. Batch experiments indicated that compared with FeO-AQDS and FeO groups, FeO-AC group showed higher catalytic performance and TN removal efficiency reached 85.7%. Quinone (CO) and phenolic (-OH) chemical groups of AC were equipped with electron transfer capacity (76.51 ± 9.27 μmol e g). Moreover, Fe(II)/Fe(III) species and the secondary iron minerals were found in our system. Microbial analysis showed that Proteobacteria and Acidobacteriota, which observed with relatively high abundance, were played an important role in the integrated Feammox system. This study demonstrates the significant influence of AC on Feammox process and provides an enhanced biological nitrogen removal strategy for practice engineering application.
厌氧氨氧化耦合三价铁还原（Feammox）是一种在低 C/N 废水处理中自养生物脱氮（BNR）技术。然而，Feammox 的氮去除率受到胞外电子传递的限制。在这项研究中，选择木屑活性炭（AC）作为电子穿梭体来增强 Feammox 过程的启动。在 150 天的运行期内，NH-N 去除效率达到 97.9-99.5%，容积负荷率（VLR）为 0.04-0.06 kg N m d。批实验表明，与 FeO-AQDS 和 FeO 组相比，FeO-AC 组表现出更高的催化性能和 TN 去除效率，达到 85.7%。AC 具有醌（CO）和酚（-OH）化学基团，具有电子传递能力（76.51±9.27 μmol e g）。此外，在我们的系统中发现了 Fe(II)/Fe(III) 物种和次生铁矿物。微生物分析表明，丰度相对较高的变形菌门和酸杆菌门在集成的 Feammox 系统中发挥了重要作用。本研究表明了 AC 对 Feammox 过程的显著影响，并为实际工程应用提供了一种增强的生物脱氮策略。
