State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai 201620, PR China.
State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai 201620, PR China.
Bioresour Technol. 2019 Dec;294:122189. doi: 10.1016/j.biortech.2019.122189. Epub 2019 Sep 24.
In this study, various modified agricultural wastes (modified canna leaves (MCL), modified rice straw (MRS) and modified peanut shells (MPS)) as solid carbon sources (SCSs) were used to remove nitrate in constructed wetlands (CWs). Then, modified SCSs combined with nZVI (SCSN) as co-electrons further enhanced both heterotrophic denitrification (HD) and autotrophic denitrification (AD) performance of CWs. The results showed that NO-N removal efficiencies in CWs with SCSNs (75.3-91.1%) and in CWs with SCSs (63.3-65.5%) were significantly higher than that in CK-CW (47.0%). The presence of SCSs reduced the accumulation of NO-N in CWs. Compared to the addition of SCSs, the addition of SCSNs decreased the effluent COD concentration in CWs, avoiding secondary pollution. In addition, the solid-phase denitrifiers Silanimonas and Thauera were enriched in MPS-CW. Thermomonas, an autotrophic denitrifying bacteria (ADB), and Azospira, a nitrate-reducing Fe (II) oxidation bacteria (NRFOB), exhibited high relative abundance in MPN-CW.
在这项研究中，各种改性农业废弃物（改性美人蕉叶（MCL）、改性稻草（MRS）和改性花生壳（MPS））作为固体碳源（SCS）被用于人工湿地（CW）中去除硝酸盐。然后，改性 SCS 与纳米零价铁（nZVI）（SCSN）结合作为共电子体进一步增强了 CW 中的异养反硝化（HD）和自养反硝化（AD）性能。结果表明，SCSN 存在的 CW 中的 NO-N 去除效率（75.3-91.1%）和 SCS 存在的 CW 中的 NO-N 去除效率（63.3-65.5%）明显高于 CK-CW（47.0%）。SCS 的存在减少了 CW 中 NO-N 的积累。与添加 SCS 相比，添加 SCSN 降低了 CW 中的出水 COD 浓度，避免了二次污染。此外，在 MPS-CW 中富集了固相反硝化菌 Silanimonas 和 Thauera。在 MPN-CW 中，自养反硝化细菌（ADB）Thermomonas 和硝酸盐还原 Fe（II）氧化细菌（NRFOB）Azospira 的相对丰度较高。
