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许丹, 黄铭意, 韩胡威, 欧阳言荣, 郭亚丹, 肖恩荣, 吴振斌. 三种挺水植物对CW-MFC耦合系统脱氮及产电性能的影响[J]. 水生生物学报, 2023, 47(7): 1148-1156. DOI: 10.7541/2023.2022.0377
引用本文: 许丹, 黄铭意, 韩胡威, 欧阳言荣, 郭亚丹, 肖恩荣, 吴振斌. 三种挺水植物对CW-MFC耦合系统脱氮及产电性能的影响[J]. 水生生物学报, 2023, 47(7): 1148-1156. DOI: 10.7541/2023.2022.0377
XU Dan, HUANG Ming-Yi, HAN Hu-Wei, OUYANG Yan-Rong, GUO Ya-Dan, XIAO En-Rong, WU Zhen-Bin. THREE EMERGENT AQUATIC PLANTS ON NITROGEN REMOVAL AND ELECTRICITY GENERATION PERFORMANCE OF CW-MFC COUPLING SYSTEM[J]. ACTA HYDROBIOLOGICA SINICA, 2023, 47(7): 1148-1156. DOI: 10.7541/2023.2022.0377
Citation: XU Dan, HUANG Ming-Yi, HAN Hu-Wei, OUYANG Yan-Rong, GUO Ya-Dan, XIAO En-Rong, WU Zhen-Bin. THREE EMERGENT AQUATIC PLANTS ON NITROGEN REMOVAL AND ELECTRICITY GENERATION PERFORMANCE OF CW-MFC COUPLING SYSTEM[J]. ACTA HYDROBIOLOGICA SINICA, 2023, 47(7): 1148-1156. DOI: 10.7541/2023.2022.0377

三种挺水植物对CW-MFC耦合系统脱氮及产电性能的影响

THREE EMERGENT AQUATIC PLANTS ON NITROGEN REMOVAL AND ELECTRICITY GENERATION PERFORMANCE OF CW-MFC COUPLING SYSTEM

  • 摘要: 为探究不同植物类型对人工湿地微生物燃料电池系统(CW-MFC)耦合系统脱氮和产电性能的影响及机制, 分别以芦苇(reed)、千屈菜(Lythrum salicaria)和美人蕉(Canna indica)构建3组CW-MFC小试系统, 依次标记为CM-R、CM-L及CM-C。结果显示: (1) CW-MFC耦合系统的输出电压和功率密度呈现CM-L>CM-C>CM-R; (2) CM-R耦合系统的\rmNH^+_4 -N和TN去除率(76.8±9.9)%; (54.2±8.2)%显著高于CM-L(61.2±8.0)%; (43.1±6.5)%高于CM-C(58.9±9.5)%; (42.0±9.8)%, P<0.01; (3) 植物生长速率整体表现为CM-R>CM-C>CM-L, 并且千屈菜(CM-L)的叶片中MDA含量最高, 代表其受损害程度可能较高; (4) 地杆菌属(Geobacter)作为典型的产电菌属, 在3个耦合系统中均具有较高丰度(4.45%—7.64%), 并且其相对丰度大小与输出电压和功率密度大小变化趋势一致, 此外, CM-R中不动杆菌属(Acinetobacter)和黄杆菌属(Flavobacterium)的相对丰度分别为21.10%和14.37%, 显著高于其他两个系统(CM-L: 0.33%和0.10%; CM-C: 0.75%和0.07%), 是CM-R中主要的脱氮菌属; (5) 结合FAPROTAX 预测结果可知, 共检测出包括化能异养、好氧化能异养、铁呼吸、硝酸盐还原和氮呼吸等在内的47组功能群组, 同时结果还表明CM-R耦合系统的功能群组与其他两个系统差异较大, 其中化能异氧和好氧化能异养功能群组在CM-R中占比较高。该结果有助于加强植物对人工湿地微生物燃料电池耦合系统产电和脱氮性能影响的认识。

     

    Abstract: To explore the effects and mechanisms of different wetland plants on nitrogen removal and electricity generation performance of CW-MFC coupling system, three groups of CW-MFC pilot systems were constructed with reed, Lythrum salicaria, and Canna indica, which were recorded as CM-R, CM-L, and CM-C, respectively. The results revealed that: 1) the output voltage and power density of CW-MFC coupling system were CM-L>CM-C>CM-R; 2) the NH4+-N and TN removal rates of CM-R coupling system (76.8±9.9)%; (54.2±8.2)% were higher than that of CM-L system (61.2±8.0)%; (43.1±6.5)%, which were higher than that of CM-C system (58.9±9.5)%; (42.0±9.8)%, P<0.01; 3) the overall growth rate of plants was CM-R> CM-C>CM-L, and the MDA content was the highest in the leaves of Lythrum salicaria (CM-L), indicating that the degree of its damage may be higher; 4) Geobacter, as a typical electrogenesis genus, had a high abundance (4.45% to 7.64%) in all three coupling systems, and its abundance was consistent with the change trend of output voltage and power density, whereas the relative abundance of Acinetobacter and Flavobacterium in CM-R was 21.10% and 14.37%, significantly higher than that of the other two systems (CM-L: 0.33% and 0.10%; CM-C: 0.75% and 0.07%), which was the most dominant genus of denitrification bacteria in CM-R; 5) combined with the FACOPTAX predictions, a total of 47 functional groups including chemoheterotrophy, aerobic chemoheterotrophy, iron respiration, nitrate reduction and nitrogen respiration were detected, and the results also showed that the functional groups of the CM-R were quite different from the other two systems, among which the functional groups of chemoheterotrophy and aerobic chemoheterotrophy accounted for a relatively high proportion in CM-R. The results will help to strengthen plant understanding of the effects of electrogenesis and denitrification performance on the CW-MFC coupling system.

     

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