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人工湿地微生物燃料电池(constructed wetland - microbial fuel cell, CW-MFC)是一种结合人工湿地(CW)和微生物燃料电池(MFC)的新兴技术,该技术能在对污水净化的同时高效产电,具有广阔的应用前景和实际价值,在近些年得到广泛关注 [1]。目前,大量的研究集中在上流式CW-MFC方面,但最大输出功率密度通常仅为10~30 mW·m−2 [2-3]。上流式CW-MFC可能由于长时间的运行,从而形成污泥堵塞效应,导致系统的内阻变大,影响电子量转移,进而引起产电性能下降 [4-5]。DOHERTY通过下流式与上流式协同作用将系统的最大输出功率密度由单一上流式的16.8 mW·m−2提高至27.6 mW·m−2 [6],由此可知,下流式作用是不可忽视的。然而,关于一体化下流式CW-MFC产电性能的研究鲜有报道。
CW-MFC运行时通常采用葡萄糖或乙酸钠作为基质碳源 [7-8],然而不同基质碳源(乙酸钠、葡萄糖和丙酸)会影响阳极生物的形成和系统内阻 [9],同时会影响系统的产电性能。当以葡萄糖和乙酸钠为下流式CW-MFC的基质碳源时,对系统启动时间及电化学性能的影响如何,目前尚未见报道。为了降低植物对实验的影响及复杂性,在设计构建的下流式CW-MFC系统中通常不种植植物。为了解基质碳源对下流式CW-MFC的电化学行为影响,本研究分析了其产电性能和电化学行为,并通过微生物群落结构分析及FAPROTAX功能预测从微生物学角度探究葡萄糖和乙酸钠作为基质碳源下的功能菌群,以期为一体化下流式CW-MFC在实现同时高效产电与治理污染水体的研究中提供参考。
不同基质碳源下人工湿地微生物燃料电池的电化学性能及微生物群落结构
Electrochemical properties and microbial community structure of constructed wetland microbial fuel cell under different matrix carbon source
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摘要: 通过设计一种下流式人工湿地微生物燃料电池(CW-MFC)系统,研究了以葡萄糖(S.G.)和乙酸钠(S.S.)为基质碳源时系统的电化学性能及其微生物群落结构,揭示了该系统在不同基质碳源下的产电特性。结果表明,S.S.发电电压可达483 mV,最大功率密度为48.14 mW·m−2,优于S.G.(42.61 mW·m−2)。S.S.对水体COD的去除率比S.G.(70.1%) 高出5%。电化学性能表征结果表明,S.S.比S.G.具有更快的电子转移能力,S.S.的电荷转移电阻(45.2 Ω)小于S.G.(197 Ω)。与S.G.相比,在S.S.中发现 Clostridium_sensu_stricto_1(梭状芽胞杆菌)和 Pseudomonas(假单胞菌)丰度的降低,Acinetobacter(不动杆菌)、Acetobacteroides(类醋酸杆菌)、Lactococcus(乳球菌)和 Geobacter(地杆菌)丰度的升高。此外,结合FAPROTAX预测结果可知,与发电有关细菌的相对丰度在S.S.中高于S.G.。以上研究结果证明了乙酸钠可作为CW-MFC基质碳源的潜力,同时本研究设计的下流式CW-MFC系统有助于为后续污染水体的治理提供参考。
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关键词:
- 下流式 /
- 人工湿地微生物燃料电池 /
- 电化学性能 /
- 微生物群落
Abstract: For revealing the electricity generation and other characteristics of downflow constructed wetland microbial fuel cell(CW-MFC), it is needed to identify the electricity generation voltage, output power density, electrochemical performance, microbial community structure and FAPROTAX prediction result of downflow CW-MFC. In this study, the electrochemical properties and microbial community structure of downflow CW-MFC under the matrix carbon source of glucose(S.G.) and sodium acetate(S.S.) were compared. The results indicates that the electricity generation voltage of S.S. could reach 483 mV, and the maximum power density was 48.14 mW·m−2 , which was higher than S.G.(42.61 mW·m−2). The COD removal rate of S.S. was 5% higher than that of S.G.(70.1%). Electrochemical performance indicates that the S.S. had a faster electron transferability compared with S.G. The charge transfer resistance of S.S.(45.2 Ω) was lower than that of S.G.(197 Ω). Compared with S.G. based CW-MFC, a decreased abundance of Clostridium_sensu_stricto_1 and Pseu-domonas, and accompanied by an increase of Acinetobacter, Acetobacteroides, Lactococcus and Geobacter occurred in the S.S. based CW-MFC. The relative abundance of bacteria associated with electricity generation in S.S. was higher than that in S.G., which was found by the results of FAPROTAX prediction. The potential of sodium acetate as matrix carbon source for CW-MFC was confirmed. At the same time, this study can provide a reference for the follow-up research on the electricity generation and polluted water treatment by this designed downflow CW-MFC system. -
表 1 与其他已报道CW-MFC在发电性能上的比较
Table 1. Compared with other reported CW-MFC on the power generation performance
表 2 Alpha指数统计表
Table 2. Alpha index statistical table
基质碳源 有效OTUs Chao1 Shannon Simpson Ace S.G. 1 136 1 140.042 6.017 0.922 1 150.820 S.S. 729 777.030 5.676 0.943 783.491 -
[1] GUITTONNY-PHILIPPE A, MASOTTI V, HOEHENER P, et al. Constructed wetlands to reduce metal pollution from industrial catchments in aquatic mediterranean ecosystems: A review to overcome obstacles and suggest potential solutions[J]. Environment International, 2014, 64: 1-16. doi: 10.1016/j.envint.2013.11.016 [2] LIU S T, SONG H L, WEI S Z, et al. Bio-cathode materials evaluation and configuration optimization for power output of vertical subsurface flow constructed wetland-microbial fuel cell systems[J]. Bioresource Technology, 2014, 166: 575-583. doi: 10.1016/j.biortech.2014.05.104 [3] LI H, ZHANG S, YANG X L, et al. Enhanced degradation of bisphenol A and ibuprofen by an up-flow microbial fuel cell-coupled constructed wetland and analysis of bacterial community structure[J]. Chemosphere, 2019, 217: 599-608. doi: 10.1016/j.chemosphere.2018.11.022 [4] REYES-CONTRERAS C, MATAMOROS V, RUIZ I, et al. Evaluation of PPCPs removal in a combined anaerobic digester-constructed wetland pilot plant treating urban wastewater[J]. Chemosphere, 2011, 84(9): 1200-1207. doi: 10.1016/j.chemosphere.2011.06.003 [5] CORBELLA C, GARCÍA J, PUIGAGUT J. Microbial fuel cells for clogging assessment in constructed wetlands[J]. Science of the Total Environment, 2016, 569-570: 1060-1063. doi: 10.1016/j.scitotenv.2016.06.163 [6] DOHERTY L, ZHAO X H, ZHAO Y Q, et al. The effects of electrode spacing and flow direction on the performance of microbial fuel cell-constructed wetland[J]. Ecological Engineering, 2015, 79: 8-14. doi: 10.1016/j.ecoleng.2015.03.004 [7] DI L Y, LI Y, NIE L K, et al. Influence of plant radial oxygen loss in constructed wetland combined with microbial fuel cell on nitrobenzene removal from aqueous solution[J]. Journal of Hazardous Materials, 2020, 394: 122542. doi: 10.1016/j.jhazmat.2020.122542 [8] WANG L M, PANG Q Q, PENG F Q, et al. Response characteristics of nitrifying bacteria and archaea community involved in nitrogen removal and bioelectricity generation in integrated tidal flow constructed wetland-microbial fuel cell[J]. Frontiers in Microbiology, 2020, 11: 1385. doi: 10.3389/fmicb.2020.01385 [9] ZHENG J Z, LI J C, XU K D, et al. Effects of different substrates on MEC anode film formation and extracellular polymer[J]. IOP Conference Series:Earth and Environmental Science, 2020, 555: 012124. doi: 10.1088/1755-1315/555/1/012124 [10] FANG Z, SONG H L, YU R, et al. A microbial fuel cell-coupled constructed wetland promotes degradation of azo dye decolorization products[J]. Ecological Engineering, 2016, 94: 455-463. doi: 10.1016/j.ecoleng.2016.06.020 [11] PENG X W, CHEN S L, LIU L, et al. Modified stainless steel for high performance and stable anode in microbial fuel cells[J]. Electrochimica Acta, 2016, 194: 246-252. doi: 10.1016/j.electacta.2016.02.127 [12] XU L, ZHAO Y Q, DOHERTY L, et al. Promoting the bio-cathode formation of a constructed wetland-microbial fuel cell by using powder activated carbon modified alum sludge in anode chamber[J]. Scientific Reports, 2016, 6: 26514. doi: 10.1038/srep26514 [13] HARTL M, BEDOYA-RIOS D F, FERNANDEZ-GATELL M, et al. Contaminants removal and bacterial activity enhancement along the flow path of constructed wetland microbial fuel cells[J]. Science of the Total Environment, 2019, 652: 1195-1208. doi: 10.1016/j.scitotenv.2018.10.234 [14] YADAV A K, DASH P, MOHANTY A, et al. Performance assessment of innovative constructed wetland-microbial fuel cell for electricity production and dye removal[J]. Ecological Engineering, 2012, 47: 126-131. doi: 10.1016/j.ecoleng.2012.06.029 [15] XU L, ZHAO Y Q, TANG C, et al. Influence of glass wool as separator on bioelectricity generation in a constructed wetland-microbial fuel cell[J]. Journal of Environmental Management, 2018, 207: 116-123. [16] GUO Y T, WANG G Z, ZHANG H, et al. Effects of biofilm transfer and electron mediators transfer on Klebsiella quasipneumoniae sp. 203 electricity generation performance in MFCs[J]. Biotechnology for Biofuels, 2020, 13: 162. doi: 10.1186/s13068-020-01800-1 [17] ZHOU Y, XU D, XIAO E R, et al. Relationship between electrogenic performance and physiological change of four wetland plants in constructed wetland-microbial fuel cells during non-growing seasons[J]. Journal of Environmental Sciences, 2018, 70: 54-62. doi: 10.1016/j.jes.2017.11.008 [18] WANG G Z, GUO Y T, CAI J Y, et al. Electricity production and the analysis of the anode microbial community in a constructed wetland-microbial fuel cell[J]. RSC Advances, 2019, 9(37): 21460-21472. doi: 10.1039/C8RA10130B [19] WANG J, HE M F, ZHANG D L, et al. Simultaneous degradation of tetracycline by a microbial fuel cell and its toxicity evaluation by zebrafish[J]. RSC Advances, 2017, 7(70): 44226-44233. doi: 10.1039/C7RA07799H [20] SASAKI D, SASAKI K, TSUGE Y, et al. Less biomass and intracellular glutamate in anodic biofilms lead to efficient electricity generation by microbial fuel cells[J]. Biotechnology for Biofuels, 2019, 12(1): 72. doi: 10.1186/s13068-019-1414-y [21] WANG J F, SONG X S, WANG Y H, et al. Bioelectricity generation, contaminant removal and bacterial community distribution as affected by substrate material size and aquatic macrophyte in constructed wetland-microbial fuel cell[J]. Bioresource Technology, 2017, 245: 372-378. doi: 10.1016/j.biortech.2017.08.191 [22] ISLAM M A, KARIM A, WOON C W, et al. Augmentation of air cathode microbial fuel cell performance using wild type Klebsiella variicola[J]. RSC Advances, 2017, 7(8): 4798-4805. doi: 10.1039/C6RA24835G [23] ZHAO S, LIU P, NIU Y Y, et al. A novel early warning system based on a sediment microbial fuel cell for in situ and real time hexavalent chromium detection in industrial wastewater[J]. Sensors, 2018, 18(3): 642. doi: 10.3390/s18020642 [24] RAYCHAUDHURI A, BEHERA M. Ceramic membrane modified with rice husk ash for application in microbial fuel cells[J]. Electrochimica Acta, 2020, 363: 137261. doi: 10.1016/j.electacta.2020.137261 [25] LOWY D A, TENDER L M, ZEIKUS J G, et al. Harvesting energy from the marine sediment-water interface II Kinetic activity of anode materials[J]. Biosensors and Bioelectronics, 2006, 21(11): 2058-2063. doi: 10.1016/j.bios.2006.01.033 [26] TAFEL J. Über die polarisation bei kathodischer wasserstoffentwicklung[J]. Zeitschrift für Physikalische Chemie, 1905, 50U(1): 641-712. [27] FU X W, WU D. Effect of di-(2-ethylhexyl) phthalate on the microbial community in vegetables phyllosphere[J]. American Journal of Biochemistry and Biotechnology, 2020, 16(1): 25-31. doi: 10.3844/ajbbsp.2020.25.31 [28] LI X R, YANG R W, JU H P, et al. Identification of dominant spoilage bacteria in sea cucumber protein peptide powders (SCPPs) and methods for controlling the growth of dominant spoilage bacteria by inhibiting hygroscopicity[J]. LWT, 2021, 136: 110355. doi: 10.1016/j.lwt.2020.110355 [29] SANSUPA C, WAHDAN S F M, HOSSEN S, et al. Can we use functional annotation of prokaryotic taxa (FAPROTAX) to assign the ecological functions of soil bacteria?[J]. Applied Sciences, 2021, 11(2): 688. doi: 10.3390/app11020688 [30] 樊磊, 赵煜, 李婷, 等. 葡萄糖乙酸钠不同基质微生物燃料电池电化学性能对比研究[J]. 电化学, 2016, 22(1): 81-87. [31] 周昱宏. 微生物燃料电池处理含氮废水的研究[D]. 杭州: 浙江大学, 2018. [32] FANG Z, SONG H L, CANG N, et al. Electricity production from azo dye wastewater using a microbial fuel cell coupled constructed wetland operating under different operating conditions[J]. Biosensors and Bioelectronics, 2015, 68: 135-141. doi: 10.1016/j.bios.2014.12.047 [33] VILLASEÑOR CAMACHO J, RODRÍGUEZ ROMERO L, FERNÁNDEZ MARCHANTE C M, et al. The salinity effects on the performance of a constructed wetland-microbial fuel cell[J]. Ecological Engineering, 2017, 107: 1-7. doi: 10.1016/j.ecoleng.2017.06.056 [34] XU L, ZHAO Y Q, WANG X D, et al. Applying multiple bio-cathodes in constructed wetland-microbial fuel cell for promoting energy production and bioelectrical derived nitrification-denitrification process[J]. Chemical Engineering Journal, 2018, 344: 105-113. doi: 10.1016/j.cej.2018.03.065 [35] YANG Y, SHEN Q Y. Electrochemical properties and pollution remediation mechanism of P-MFC anode under cadmium stress[J]. Polish Journal of Environmental Studies, 2019, 28(5): 3985-3992. doi: 10.15244/pjoes/94587 [36] SANDFORD C, EDWARDS M A, KLUNDER K J, et al. A synthetic chemist's guide to electroanalytical tools for studying reaction mechanisms[J]. Chemical Science, 2019, 10(26): 6404-6422. doi: 10.1039/C9SC01545K [37] JADHAV D A, JAIN S C, GHANGREKAR M M. Cow's urine as a yellow gold for bioelectricity generation in low cost clayware microbial fuel cell[J]. Energy, 2016, 113: 76-84. doi: 10.1016/j.energy.2016.07.025 [38] PAREEK A, SRAVAN J S, MOHAN S V. Fabrication of three-dimensional graphene anode for augmenting performance in microbial fuel cells[J]. Carbon Resources Conversion, 2019, 2(2): 134-140. doi: 10.1016/j.crcon.2019.06.003 [39] XIANG C C, LI M, ZHI M J, et al. A reduced graphene oxide/Co3O4 composite for supercapacitor electrode[J]. Journal of Power Sources, 2013, 226: 65-70. doi: 10.1016/j.jpowsour.2012.10.064 [40] TAJPARAST M, GLAVINOVIĆ M I. Effect of ion concentration, solution and membrane permittivity on electric energy storage and capacitance[J]. Biochimica et Biophysica Acta (BBA) - Biomembranes, 2018, 1860(11): 2385-2403. doi: 10.1016/j.bbamem.2018.06.003 [41] SHARMA M, ALVAREZ-GALLEGO Y, ACHOUAK W, et al. Electrode material properties for designing effective microbial electrosynthesis systems[J]. Journal of Materials Chemistry A, 2019, 7(42): 24420-24436. doi: 10.1039/C9TA04886C [42] BOINOVICH L B, GNEDENKOV S V, ALPYSBAEVA D A, et al. Corrosion resistance of composite coatings on low-carbon steel containing hydrophobic and superhydrophobic layers in combination with oxide sublayers[J]. Corrosion Science, 2012, 55: 238-245. doi: 10.1016/j.corsci.2011.10.023 [43] SALARI M, KONSTANTINOV K, LIU H K. Enhancement of the capacitance in TiO2 nanotubes through controlled introduction of oxygen vacancies[J]. Journal of Materials Chemistry, 2011, 21(13): 5128. doi: 10.1039/c0jm04085a [44] TELIS V R N, TELIS-ROMERO J, MAZZOTTI H B, et al. Viscosity of aqueous carbohydrate solutions at different temperatures and concentrations[J]. International Journal of Food Properties, 2007, 10(1): 185-195. doi: 10.1080/10942910600673636 [45] KHARAT S J. Density, viscosity and ultrasonic velocity studies of aqueous solutions of sodium acetate at different temperatures[J]. Journal of Molecular Liquids, 2008, 140: 10-14. doi: 10.1016/j.molliq.2007.12.006 [46] YE D D, YANG Y, LI J, et al. Performance of a microfluidic microbial fuel cell based on graphite electrodes[J]. International Journal of Hydrogen Energy, 2013, 38(35): 15710-15715. doi: 10.1016/j.ijhydene.2013.05.034 [47] WANG J F, SONG X S, WANG Y H, et al. Nitrate removal and bioenergy production in constructed wetland coupled with microbial fuel cell: establishment of electrochemically active bacteria community on anode[J]. Bioresource Technology, 2016, 221: 358-365. doi: 10.1016/j.biortech.2016.09.054 [48] CHU N, ZHANG L X, HAO W, et al. Rechargeable microbial fuel cell based on bidirectional extracellular electron transfer[J]. Bioresource Technology, 2021, 329: 124887. doi: 10.1016/j.biortech.2021.124887 [49] LV J H, TU M M, CHEN X Y, et al. Effect of potassium persulphate addition on sludge disintegration of a mesophilic anaerobic fermentation system[J]. Environmental Technology, 2020, 1: 1-14. [50] JABLONSKA M A, RYBARCZYK M K, LIEDER M. Electricity generation from rapeseed straw hydrolysates using microbial fuel cells[J]. Bioresource Technology, 2016, 208: 117-122. doi: 10.1016/j.biortech.2016.01.062 [51] TIAN T, QIAO S, YU C, et al. Bio-electrochemically assisting low-temperature anaerobic digestion of low-organic strength wastewater[J]. Chemical Engineering Journal, 2018, 335: 657-664. doi: 10.1016/j.cej.2017.11.016 [52] ZHANG J, GUO R B, QIU Y L, et al. Bioaugmentation with an acetate-type fermentation bacterium Acetobacteroides hydrogenigenes improves methane production from corn straw[J]. Bioresource Technology, 2015, 179: 306-313. doi: 10.1016/j.biortech.2014.12.022 [53] LI T, ZHOU Q X, ZHOU L A, et al. Acetate limitation selects Geobacter from mixed inoculum and reduces polysaccharide in electroactive biofilm[J]. Water Research, 2020, 177: 115776. doi: 10.1016/j.watres.2020.115776 [54] SCIARRIA T P, ARIOLI S, GARGARI G, et al. Monitoring microbial communities’ dynamics during the start-up of microbial fuel cells by high-throughput screening techniques[J]. Biotechnology Reports, 2019, 21: e00310. doi: 10.1016/j.btre.2019.e00310 [55] LI Y L, ZHANG B G, CHENG M, et al. Spontaneous arsenic (III) oxidation with bioelectricity generation in single-chamber microbial fuel cells[J]. Journal of Hazardous Materials, 2016, 306: 8-12. doi: 10.1016/j.jhazmat.2015.12.003 [56] SIMA W P, MA R X, YIN F X, et al. Prompt nitrogen removal by controlling the oxygen concentration in sediment microbial fuel cell systems: the electrons allocation and its microbial mechanism[J]. Water Science and Technology, 2020, 81(6): 1209-1220. doi: 10.2166/wst.2020.222 [57] GAO Y H. Syntrophic interactions between anode-respiring bacteria and non-anode-respiring bacteria in microbial electrochemical cells[D]. Waterloo, Ontario, Canada: the University of Waterloo, 2015. [58] EKO S, ENDANG S S. Bioelectricity generation by biomass of ammonification bacteria consortia in a mediatorless microbial fuel cell (MFC)[J]. International Journal of Environment and Bioenergy, 2012, 3(1): 1-11.