Ojaghi Aghil, Shafaie Tonkaboni Sied Ziaedin, Shariati Parvin, Doulati Ardejani Faramarz
1School of Mining, College of Engineering, University of Tehran, Tehran, Iran.
2Department of Industrial and Environmental Biotechnology, Bioprocess Engineering Research Group, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran.
J Environ Health Sci Eng. 2018 May 21;16(2):99-108. doi: 10.1007/s40201-018-0289-3. eCollection 2018 Dec.
Electro-biodegradation is a novel technique for cyanide degradation in aqueous solutions. Many physical, chemical, and biological methods have been developed and used to treat cyanide degradation. The biological methods are more environmentally-friendly and economically cost-effective when compared to other techniques, however, the process reaction time period is much longer and the efficiency is lower.
In this research, the bacterial strain, ATCC 7061, was tested for the first time to introduce the Cyanide Electro-biodegradation technique. By using a direct current power supply, electrons were generated in an electro-biodegradation cell containing culture media at free cyanide concentrations of 100 to 500 mg/l, under alkaline conditions.
Experimental tests showed that when electrons were added and bacteria were inoculated into the aqueous media containing 100, 200, 300, 400 and 500 mg/l of free cyanide, the cyanide degradation efficiency increased from 16.2, 21.6, 29.5, 38.7 and 44.5% to 98.6, 99.3, 99.7, 99.8 and 99.7%, in 36, 72, 137, 233 and 301 h, respectively. The results show that by adding electrons, the process reaction time decreases and cyanide degradation efficiency increases significantly.
The results presented here demonstrate for the first time the importance and the significance of the electro-biodegradation technique in the efficient degradation and removal of cyanide present in aqueous solutions.
电生物降解是一种用于水溶液中氰化物降解的新技术。已经开发并使用了许多物理、化学和生物方法来处理氰化物降解。与其他技术相比，生物方法更环保且经济成本效益更高，然而，该过程的反应时间更长且效率更低。
在本研究中，首次测试了ATCC 7061菌株以引入氰化物电生物降解技术。通过使用直流电源，在含有培养基的电生物降解池中，在碱性条件下，当游离氰化物浓度为100至500mg/l时产生电子。
实验测试表明，当向含有100、200、300、400和500mg/l游离氰化物的水介质中添加电子并接种细菌时，氰化物降解效率分别在36、72、137、233和301小时内从16.2%、21.6%、29.5%、38.7%和44.5%提高到98.6%、99.3%、99.7%、99.8%和99.7%。结果表明，通过添加电子，过程反应时间缩短，氰化物降解效率显著提高。
此处给出的结果首次证明了电生物降解技术在高效降解和去除水溶液中存在的氰化物方面的重要性和意义。
