Zhejiang Province Key Laboratory of Recycling and Ecological Treatment of Waste Biomass, School of Environment and Natural Resources, Zhejiang University of Science & Technology, Hangzhou, Zhejiang 310023, China; Dooge Centre for Water Resources Research, School of Civil Engineering, University College Dublin, Belfield Dublin 4, Ireland.
Zhejiang Province Key Laboratory of Recycling and Ecological Treatment of Waste Biomass, School of Environment and Natural Resources, Zhejiang University of Science & Technology, Hangzhou, Zhejiang 310023, China.
Bioresour Technol. 2023 Jan;367:128240. doi: 10.1016/j.biortech.2022.128240. Epub 2022 Nov 1.
Pyrrhotite is a promising electron donor for autotrophic denitrification. Using pyrrhotite as the substrate in constructed wetlands (CWs) can enhance the nitrogen removal performance in carbon-limited wastewater treatment. However, the role of plants in pyrrhotite-integrated CW is under debate as the oxygen released from plant roots may destroy the anoxic condition for autotrophic denitrification. This study compared pyrrhotite-integrated CWs with and without plants and identified the effects of plants' presence in nitrogen removal, pyrrhotite oxidized dissolution, and microbial community. The results show that plants enhanced the TN removal significantly (from 41.6 ± 3.9 % to 97.1 ± 2.6 %). Plants can accelerate the PAD in CW through the strengthening of pyrrhotite dissolution. Enriched functional (Thiobacillus and Acidiferrobacter) and a more complex bacterial co-occurrence network has been found in CW with plants. This study identified the role of plants in PAD acceleration, providing an in-depth understanding of pyrrhotite in CW systems.
磁黄铁矿是一种很有前途的自养反硝化电子供体。在人工湿地（CWs）中使用磁黄铁矿作为基质可以提高在碳限制废水中的脱氮性能。然而，植物在磁黄铁矿集成 CW 中的作用存在争议，因为植物根释放的氧气可能会破坏自养反硝化的缺氧条件。本研究比较了有无植物的磁黄铁矿集成 CW 的性能，并确定了植物在氮去除、磁黄铁矿氧化溶解和微生物群落中的存在的影响。结果表明，植物显著提高了 TN 的去除效果（从 41.6±3.9%提高到 97.1±2.6%）。植物可以通过加强磁黄铁矿的溶解来加速 CW 中的 PAD。在有植物的 CW 中，富集了功能（硫杆菌属和嗜酸菌属）和更复杂的细菌共生网络。本研究确定了植物在 PAD 加速中的作用，为磁黄铁矿在 CW 系统中的应用提供了深入的理解。
