Fe0/厌氧微生物联合体系降解硝基苯的研究

利用Fe0/厌氧微生物联合体系降解硝基苯(NB), 结果显示, Fe0与厌氧微生物之间存在明显的协同效应, 硝基苯的降解效果随零价铁投加量的增加而提高；最佳pH值为5.0~6.0；添加少量共代谢初级基质(葡萄糖), 可以大幅度提高硝基苯的降解；较高浓度铁离子对硝基苯的降解表现出一定的抑制作用, 添加0.5 mg/L的Fe3+或Fe2+可以加快硝基苯的降解。硝基苯降解的主要产物为苯胺, 降解过程遵循一级动力学模型, 一级反应速率常数k值随硝基苯浓度的提高而降低。

Study on Degradation of Nitrobenzene by Integrated Microbial-Fe0 Treatment System

The degradation of nitrobenzene(NB) using a combination of Fe0 and anaerobic microorganism was studied. Nitrobenzene could be degraded effectively and the synergistic effect between Fe0 and anaerobic microorganism was apparent, and the nitrobenzene removal efficiency increased with the increasing of Fe0; the optimum pH was 5.0~6.0; as co-metabolizing substrate, glucose could promote the degradation of nitrobenzene; In case of high concentration of Fe2+ and Fe3+, the anaerobic biodegradation activity of nitrobenzene were inhibited in a certain degree; 0.5 mg/L Fe2+ and Fe3+ were the optimum to accelerate biodegradation rate of nitrobenzene; the degradation kinetics of nitrobenzene were followed by first-order reaction, reaction rate constant reduced along with the concentration of nitrobenzene increased.