Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Environment, Beijing Jiaotong University, Beijing 100044, PR China; Tangshan Research Institute of Beijing Jiaotong University, Hebei 063000, PR China.
Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Environment, Beijing Jiaotong University, Beijing 100044, PR China.
Bioresour Technol. 2024 Aug;406:131015. doi: 10.1016/j.biortech.2024.131015. Epub 2024 Jun 19.
Combining iron-carbon micro-electrolysis and autotrophic denitrification is promising for nitrate removal from wastewater. In this study, four continuous reactors were constructed using CO and weak magnetic field (WMF) to address challenges like iron passivation and pH stability. In the reactors with CO + WMF (10 and 35 mT), the increase in total nitrogen removal efficiency was significantly higher (96.2 ± 1.6 % and 94.1 ± 2.7 %, respectively) than that of the control (51.6 ± 2.7 %), and FeO converted to low-density FeO(OH) and FeCO, preventing passivation film formation. The WMF application decreased the NO emissions flux by 8.7 % and 20.5 %, respectively. With CO + WMF, the relative enzyme activity and abundance of denitrifying bacteria, especially unclassified_Rhodocyclaceae and Denitratisoma, increased. Thus, this study demonstrates that CO and WMF optimize the nitrate removal process, significantly enhancing removal efficiency, reducing greenhouse gas emissions, and improving process stability.
将铁碳微电解与自养反硝化相结合有望去除废水中的硝酸盐。本研究采用 CO 和弱磁场（WMF）构建了四个连续式反应器，以解决铁钝化和 pH 稳定性等问题。在 CO+WMF（10 和 35 mT）的反应器中，总氮去除效率的增加明显高于对照组（分别为 96.2±1.6%和 94.1±2.7%），FeO 转化为低密度的 FeO(OH)和 FeCO，防止钝化膜的形成。WMF 的应用分别降低了 8.7%和 20.5%的 NO 排放通量。在 CO+WMF 的情况下，反硝化菌，特别是未分类的 Rhodocyclaceae 和 Denitratisoma 的相对酶活性和丰度增加。因此，本研究表明，CO 和 WMF 优化了硝酸盐去除过程，显著提高了去除效率，减少了温室气体排放，提高了工艺稳定性。
