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

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 

机构地区：[1]Key Laboratory of Environmental Biotechnology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing,100085,China [2]University of Chinese Academy of Sciences,Beijing,100049,China [3]College of Civil Engineering,Nanjing Tech University,Nanjing,211816,China [4]State Key Lab of Urban Water Resource and Environment,School of Civil and Environmental Engineering,Harbin Institute of Technology Shenzhen,Shenzhen,518055,PR China [5]Tianjin Key Laboratory of Aquatic Science and Technology,School of Environmental and Municipal Engineering,Tianjin Chengjian University,Tianjin,300384,China

出　　处：《Environmental Science and Ecotechnology》2022年第3期93-101,共9页环境科学与生态技术（英文）

基　　金：This work was supported by the NSFC-EU Environmental Biotechnology joint program(No.31861133001);Key Research and Development Project of Shandong Province(No.2020CXGC011202);Shenzhen Science and Technology Program(No.KQTD20190929172630447);China Postdoctoral Science Foundation(No.2020M680708).

摘　　要：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 of
0.075 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 

分 类 号：O61[理学—无机化学]