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Conversion of nitrogen and carbon in enriched paddy soil by denitrification coupled with anammox in a bioelectrochemical system

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Journal of Environmental Sciences 2022年第1期34卷 197-207页

作者： Luan Zhang Minghe Jiang Shungui Zhou Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation College of Resources and EnvironmentFujian Agriculture and Forestry UniversityFuzhou 350002China

The aim of this study is to investigate conversion of nitrogen and COD in enriched paddy soil by nitrification coupled with anammox process in a dual chamber bioelectrochemical system.The paddy soil was enriched for denitrification coupled with anammox by microbial consortia and was acclimatized in the cathodic chamber of microbial fuel cells(MFCs).The bioelectrochemical systems were treated with different ammonium concentrations in the cathodic chamber:the MFC with low concentration ammonium(LA-MFC,50 mg/L ammonium),the MFC with medium concentration ammonium(MA-MFC,500 mg/L ammonium),and MFC with high concentration ammonium(HA-MFC,1000 mg/L ammonium),and the initial COD in the anodic chamber was 1200 mg/L.The CK treatments were conducted with1000 mg/L ammonium under the same conditions,except without inoculum in the cathode chamber.The consumption rate of ammonium in the cathodic chambers of CK,LA-MFC,MA-MFC,and HA-MFC were 9%,64%,84%,and 84%,respectively.The degradation rate for COD achieved in the anode chambers of CK,LA-MFC,MA-MFC,and HA-MFC were 70%,86%,93%,and 93%,respectively.The analysis of the microbial community of three treated MFCs in the cathode chamber indicated that the nitrification-denitrification process occurs in the cathode chamber.The dominant species for nitrification was Nitrospira,and the dominant species for denitrification were Denitratisoma,Dechloromonas,and Candidatus_Competibacter.Moreover,anammox process also observed in the cathode chamber.The functional genes nir S/K,hzs B,and 16S rDNA were assessed by qPCR analysis,and the results confirmed the presence of denitrification-coupled anammox in the cathodic chamber.

关键词： Paddy soil bioelectrochemical system Denitrification Anammox Microbial community

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A tartrate-EDTA-Fe complex mediates electron transfer and enhances ammonia recovery in a bioelectrochemical-stripping system

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Environmental Science and Ecotechnology 2022年第3期11卷 93-101页

作者： De-Xin Zhang Si-Yuan Zhai Ran Zeng Cheng-Yan Liu Bo Zhang Zhe Yu Li-Hui Yang Xi-Qi Li Ya-Nan Hou Ai-Jie Wang Hao-Yi Cheng Key Laboratory of Environmental Biotechnology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing100085China University of Chinese Academy of Sciences Beijing100049China College of Civil Engineering Nanjing Tech UniversityNanjing211816China State Key Lab of Urban Water Resource and Environment School of Civil and Environmental EngineeringHarbin Institute of Technology ShenzhenShenzhen518055PR China Tianjin Key Laboratory of Aquatic Science and Technology School of Environmental and Municipal EngineeringTianjin Chengjian UniversityTianjin300384China

Traditional bioelectrochemical systems(BESs)coupled with stripping units for ammonia recovery suffer from an insufficient supply of electron acceptors due to the low solubility of oxygen.In this study,we proposed a novel strategy to efficiently transport the oxidizing equivalent provided at the stripping unit to the cathode by introducing a highly soluble electron mediator(EM)into the catholyte.To validate this strategy,we developed a new kind of iron complex system(tartrate-EDTA-Fe)as the EM.EDTA-Fe contributed to the redox property with a midpoint potential of0.075 V(vs.standard hydrogen electrode,SHE)at pH 10,whereas tartrate acted as a stabilizer to avoid iron precipitation under alkaline conditions.At a ratio of the catholyte recirculation rate to the anolyte flow rate(RC-A)of 12,the NH4 t-N recovery rate in the system with 50mM tartrate-EDTA-Fe complex reached 6.9±0.2 g Nm^(-2) d^(-1),approximately 3.8 times higher than that in the non-EM control.With the help of the complex,our system showed an NH4 t-N recovery performance comparable to that previously reported but with an extremely low RC-A(0.5 vs.288).The strategy proposed here may guide the future of ammonia recovery BES scale-up because the introduction of an EM allows aeration to be performed only at the stripping unit instead of at every cathode,which is beneficial for the system design due to its simplicity and reliability.

关键词： bioelectrochemical system Ammonia recovery Electron mediator Stripping Tartrate-EDTA-Fe

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Selective recovery of Cu^2＋ and Ni^2＋ from wastewater using bioelectrochemical system

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Frontiers of Environmental Science & Engineering 2015年第3期9卷 522-527页

作者： Haiping LUO Bangyu QIN Guangli LIU Renduo ZHANG Yabo TANG Yanping HOU School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen University Guangzhou 510275 China

As the bioelectrochemical system, the microbial fuel cell （MFC） and the microbial electrolysis cell （MEC） were developed to selectively recover Cu^2＋ and Ni^2＋ ions from wastewater. The wastewater was treated in the cathode chambers of the system, in which Cu^2＋ and Ni^2＋ ions were removed by using the MFC and the MEC, respectively. At an initial Cu^2＋ concentration of 500 mg· L^-1, removal efficiencies of Cu^2＋ increased from 97.0%±1.8% to 99.0%±0.3% with the initial Ni^2＋ concentrations from 250 to 1000 mg· L^-1, and maximum power densities increased from 3.1±0.5 to 5.4±0.6W.m-3. The Ni^2＋ removal mass in the MEC increased from 6.84-0.2 to 20.54-1.5 mg with the increase of Ni^2＋ concentrations. At an initial Ni^2＋ concentration of 500 mg· L^-1, Cu^2＋ removal etticiencies decreased from 99.1%±0.3% to 74.2%±3.8% with the initial Cu^2＋ concentrations from 250 to 1000 mg -L1, and maximum power densities increased from 3.0±0.1 to 6.3±1.2W.m^-3. Subsequently, the Ni^2＋ removal efficiencies decreased from 96.9%-4-3.1% to 73.3%4-5.4%. The results clearly demonstrated the feasibility of selective recovery of Cu2~ and Ni2~ from the wastewater using the bioelectrochemical system.

关键词： bioelectrochemical system Cu^2＋ Ni^2＋ selective recovery

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Microbial electrosynthesis of acetate from CO_(2)in three-chamber cells with gas diffusion biocathode under moderate saline conditions

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Environmental Science and Ecotechnology 2023年第4期16卷 78-87页

作者： Paolo Dessì Claribel Buenano-Vargas Santiago Martínez-Sosa Simon Mills Anna Trego Umer ZIjaz Deepak Pant Sebastia Puig Vincent O'Flaherty Pau Farras School of Biological and Chemical Sciences and Energy Research Centre Ryan InstituteUniversity of GalwayUniversity RoadH91 CF50GalwayIreland LEQUiA Institute of the EnvironmentUniversity of GironaCarrer Maria Aurelia Capmany 69E-17003GironaSpain Microbiology Department School of Natural SciencesUniversity of GalwayUniversity RoadH91 TK33GalwayIreland Infrastructure and Environment Research Division School of EngineeringUniversity of GlasgowGlasgowUnited Kingdom Separation and Conversion Technology Flemish Institute for Technological Research(VITO)Boeretang 2002400MolBelgium

The industrial adoption of microbial electrosynthesis(MES)is hindered by high overpotentials deriving from low electrolyte conductivity and inefficient cell designs.In this study,a mixed microbial consortium originating from an anaerobic digester operated under saline conditions(∼13 g L^(−1)NaCl)was adapted for acetate production from bicarbonate in galvanostatic(0.25 mA cm^(−2))H-type cells at 5,10,15,or 20 g L^(−1)NaCl concentration.The acetogenic communities were successfully enriched only at 5 and 10 g L^(−1)NaCl,revealing an inhibitory threshold of about 6 g L^(−1)Na^(+).The enriched planktonic communities were then used as inoculum for 3D printed,three-chamber cells equipped with a gas diffusion biocathode.The cells were fed with CO_(2)gas and operated galvanostatically(0.25 or 1.00 mA cm^(−2)).The highest production rate of 55.4 g m^(−2) d^(−1)(0.89 g L^(−1)d^(−1)),with 82.4%Coulombic efficiency,was obtained at 5 g L^(−1)NaCl concentration and 1 mA cm^(−2)applied current,achieving an average acetate production of 44.7 kg MWh−1.Scanning electron microscopy and 16S rRNA sequencing analysis confirmed the formation of a cathodic biofilm dominated by Acetobacterium sp.Finally,three 3D printed cells were hydraulically connected in series to simulate an MES stack,achieving three-fold production rates than with the single cell at 0.25 mA cm^(−2).This confirms that three-chamber MES cells are an efficient and scalable technology for CO_(2)bio-electro recycling to acetate and that moderate saline conditions(5 g L^(−1)NaCl)can help reduce their power demand while preserving the activity of acetogens.

关键词： Acetobacterium bioelectrochemical system Conductivity Electrochemical cell design Gas diffusion electrode

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Multienzyme co-immobilization-based bioelectrode:Design of principles and bioelectrochemical applications

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Chinese Journal of Chemical Engineering 2020年第8期28卷 2037-2050页

作者： Ranran Wu Haiyan Song Yuanming Wang LeiWang Zhiguang Zhu Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences32West Seventh AvenueTianjin Airport Economic AreaTianjin 300308China University of Chinese Academy of Sciences 19A Yuquan RoadShijingshan DistrictBeijing 100049China National Human Genetic Resource Center 12 Dahuisi RoadHaidian DistrictBeijing 100081China

Enzyme cascade reactions play significant roles in bioelectrochemical processes because they permit more complex reactions. Co-immobilization of multienzyme on the electrode could help to facilitate substrate/intermediate transfer among different enzymes and electron transfer from enzyme active sites to the electrode with high stability and retrievability. Different co-immobilization strategies to construct multienzyme bioelectrodes have been widely reported, however, up to now, they have barely been reviewed. In this review, we focus on recent state-of-the-art techniques for constructing co-immobilized multienzyme electrodes including random and positional co-immobilization. Particular attention is given to strategies such as multienzyme complex and surface display. Cofactor co-immobilization on the electrode is also crucial for the enhancement of catalytic reaction and electron transfer, yet, few studies have been reported. The up-to-date advances in bioelectrochemical applications of multienzyme bioelectrodes are also presented. Finally, key challenges and future perspectives are discussed.

关键词： Multienzyme co-immobilization Bioelectrode bioelectrochemical system Cascade reaction

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Microbial reduction of organosulfur compounds at cathodes in bioelectrochemical systems

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Environmental Science and Ecotechnology 2020年第1期1卷 68-73页

作者： Margo Elzinga Dandan Liu Johannes B.M.Klok Pawel Roman Cees J.N.Buisman Annemiek ter Heijne Environmental Technology Wageningen UniversityBornse Weilanden 9P.O.Box 176700AA Wageningenthe Netherlands Paqell B.V Reactorweg 3013542AD Utrechtthe Netherlands Wetsus Centre of Excellence for Sustainable Water TechnologyOostergoweg 9P.O.Box 11138900CC Leeuwardenthe Netherlands

Organosulfur compounds,present in e.***.the pulp and paper industry,biogas and natural gas,need to be removed as they potentially affect human health and harm the environment.The treatment of organosulfur compounds is a challenge,as an economically feasible technology is lacking.In this study,we demonstrate that organosulfur compounds can be degraded to sulfide in bioelectrochemical systems(BESs).Methanethiol,ethanethiol,propanethiol and dimethyl disulfide were supplied separately to the biocathodes of BESs,which were controlled at a constant current density of 2 A/m^(2) and 4 A/m^(2).The decrease of methanethiol in the gas phase was correlated to the increase of dissolved sulfide in the liquid phase.A sulfur recovery,as sulfide,of 64% was found over 5 days with an addition of 0.1 mM methanethiol.Sulfur recoveries over 22 days with a total organosulfur compound addition of 1.85 mM were 18% for methanethiol and ethanethiol,17% for propanethiol and 22% for dimethyl disulfide.No sulfide was formed in electrochemical nor biological control experiments,demonstrating that both current and microorganisms are required for the conversion of organosulfur compounds.This new application of BES for degradation of organosulfur components may unlock alternative strategies for the abatement of anthropogenic organosulfur emissions.

关键词： Thiols Organosulfur compounds bioelectrochemical system

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