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生物电化学系统用于微生物电合成,可原位利用污水中的能量将二氧化碳固定,并生产有机物.通过构建生物电化学系统,利用混合菌作电催化剂还原二氧化碳生成乙酸和丁酸.设定阴极电势-0.75 V(vs Ag/AgCl),10 d的反应周期内,乙酸最大积累浓度为251.89 mg/L;丁酸从第3天开始生成,最大积累浓度为89.42 mg/L.系统总电子回收率可达85.04%.电化学分析表明生物阴极具有良好的催化活性.PCR-DGGE分析生物阴极主要菌群为醋酸杆菌属(Acetobacterium)和拟杆菌属(Bacteroides).本研究证明了生物阴极具有以二氧化碳为原始底物合成乙酸,并进一步延伸碳链合成中链脂肪酸的能力,对进一步开发微生物电合成技术具有重要参考价值.
Bioelectrochemical system for the microbial electrosynthesis, carbon dioxide can be used in situ to fix the carbon dioxide and produce organic matter in situ by using bio-electrochemical system, the use of mixed bacteria as the electrocatalyst to reduce carbon dioxide to produce acetic acid and butyric acid. Set the cathode The maximum concentration of acetic acid was 251.89 mg / L in the reaction period of 10 d, and the maximum concentration of butyric acid was 89.42 mg / L. The total electron recovery The rate of up to 85.04% .Electrochemical analysis showed that the cathode has a good catalytic activity .PCR-DGGE analysis of the main bio-cathode group is Acetobacterium (Acetobacterium) and Bacteroides (Bacteroides) .This study shows that the biological cathode has Carbon dioxide as the original substrate for the synthesis of acetic acid, and further extension of carbon chain synthesis of medium-chain fatty acids ability, further development of microbial electrosynthesis has important reference value.