Bio-electrolytic sensor for rapid monitoring of volatile fatty acids in anaerobic digestion process
Bio-electrolytic sensor for rapid monitoring of volatile fatty acids in anaerobic digestion process
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DOI：
10.1016/j.watres.2016.12.045
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发表时间：
2017-03-15
期刊：
影响因子：
12.8
通讯作者：
Zhang, Yifeng
中科院分区：
文献类型：
--
作者：
Jin, Xiangdan;Li, Xiaohu;Zhang, Yifeng
本研究提出了一种创新的生物传感器，开发的基础上的微生物电解池的快速和可靠的测量挥发性脂肪酸（VFA）在厌氧消化（AD）过程中。首先用含有不同浓度VFA的合成废水测试生物电解传感器。电流密度（0.03 ± 0.01 ~ 2.43 ± 0.12 A/m ~ 2）与VFA浓度（5-100 mM）呈线性关系（R ~（-2）= 0.99），考察了外加电压、VFA组成比、离子强度等因素对传感器性能的影响。电流密度与VFA浓度呈线性关系。此外，生物电解传感器被证明有能力处理中断，如存在复杂的有机物，阳极暴露于氧气和低pH值。最后，传感器被应用于监测VFA浓度在实验室规模的AD反应器一个月。该传感器的VFA测量值与气相色谱分析值相关性良好，证明了系统的准确性。由于在监测期间在阴极中产生氢作为副产物，因此该系统可以是能量自给自足的。考虑到高精度，响应时间短，长期稳定性和H-2生产的额外好处，这种生物电解传感器可能是一个简单和成本效益的方法，在AD和其他厌氧过程中的VFA监测。(C)2016爱思唯尔有限公司版权所有。
This study presents an innovative biosensor that was developed on the basis of a microbial electrolysis cell for fast and reliable measurement of volatile fatty acids (VFA) during anaerobic digestion (AD) process. The bio-electrolytic sensor was first tested with synthetic wastewater containing varying concentrations of VFA. A linear correlation (R-2 = 0.99) between current densities (0.03 +/- 0.01 to 2.43 +/- 0.12 A/m(2)) and VFA concentrations (5-100 mM) was found. The sensor performance was then investigated under different affecting parameters such as the external voltage, VFA composition ratio, and ionic strength. Linear relationship between the current density and VFA concentrations was always observed. Furthermore, the bio-electrolytic sensor proved ability to handle interruptions such as the presence of complex organic matter, anode exposure to oxygen and low pH. Finally, the sensor was applied to monitor VFA concentrations in a lab-scale AD reactor for a month. The VFA measurements from the sensor correlated well with those from GC analysis which proved the accuracy of the system. Since hydrogen was produced in the cathode as byproduct during monitoring, the system could be energy self-sufficient. Considering the high accuracy, short response time, long-term stability and additional benefit of H-2 production, this bio-electrolytic sensor could be a simple and cost-effective method for VFA monitoring during AD and other anaerobic processes. (C) 2016 Elsevier Ltd. All rights reserved.