State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China.
Bioresour Technol. 2023 Nov;387:129697. doi: 10.1016/j.biortech.2023.129697. Epub 2023 Aug 19.
Waste molasses, the abundant byproducts of the sugar industry, is a cost-efficient carbon source for advanced denitrification. However, the efficiency of waste molasses-driven denitrification is limited by its complex carbon content, hindering its practical application. Weak magnetic field (WMF) is reported to enhance biological nitrogen removal, but its effects on molasses-driven denitrification remains unknown. This study investigated whether the WMF can enhance waste molasses-driven nitrogen removal and explore the underlying mechanisms. It was found that WMF significantly facilitated waste molasses-driven denitrification, with total nitrogen removal efficiency increased by 1.25 times (from 77% to 96%). WMF stimulated the nitrate reductase's activity by 7-18%, and the enhancement was improved as WMF intensified. Quantitative qPCR analysis indicated that the abundances of denitrifying enzymes increased under WMF, which was consistent with the proliferation of denitrifying bacteria Denitratisoma and Devosia. This study has demonstrated that WMF is promising for enhancing complex carbon-driven denitrification processes.
废糖蜜是制糖工业的丰富副产物，是一种具有成本效益的高级反硝化碳源。然而，废糖蜜驱动反硝化的效率受到其复杂碳含量的限制，阻碍了其实际应用。弱磁场（WMF）据报道可以增强生物脱氮，但它对废糖蜜驱动反硝化的影响尚不清楚。本研究旨在探讨 WMF 是否可以增强废糖蜜驱动的氮去除，并探索其潜在机制。结果发现，WMF 显著促进了废糖蜜驱动的反硝化，总氮去除效率提高了 1.25 倍（从 77%提高到 96%）。WMF 刺激了硝酸盐还原酶的活性，提高了 7-18%，且随着 WMF 的增强而得到改善。定量 qPCR 分析表明，反硝化酶的丰度在 WMF 下增加，这与反硝化菌 Denitratisoma 和 Devosia 的增殖一致。本研究表明，WMF 有望增强复杂碳驱动的反硝化过程。
