活性碳纤维电极电吸附去除乙酸

发布时间：2018-05-28 19:52

本文选题：电吸附 + 活性碳纤维　；参考：《环境工程学报》2017年08期

【摘要】：乙酸是有机废弃物厌氧消化产氢的重要代谢产物,去除乙酸对消除产物抑制,提高氢气产率有重要作用,也是当前的技术难点。首次将电吸附技术应用于乙酸的去除,探讨了该技术路线的可行性。以活性碳纤维为电极材料,考察了电压、极板间距、流量和初始浓度等因素对电吸附去除乙酸的影响,并分析了吸附过程的等温吸附特性和动力学特性。结果表明,在电压为0.9 V,极板间距1 cm,流量21.5 m L·min~(-1)时,可将浓度为1.75 mmol·L~(-1)的乙酸溶液pH值由3.73升高至产氢菌的最适pH范围4.5~5.5,去除率达到95%以上,电吸附消除乙酸积累是可行的;等温吸附过程符合Freundlich方程;吸附过程符合一级反应动力学方程。研究结果对优化厌氧消化产氢工艺有重要指导意义。
[Abstract]:Acetic acid is an important metabolite of hydrogen production in anaerobic digestion of organic waste. Removing acetic acid plays an important role in eliminating product inhibition and increasing hydrogen yield, which is also a technical difficulty at present. For the first time, the electroadsorption technology was applied to the removal of acetic acid, and the feasibility of this technique was discussed. The effects of voltage, plate spacing, flow rate and initial concentration on the removal of acetic acid by electroadsorption were investigated using activated carbon fiber as electrode material. The isothermal adsorption and kinetic characteristics of the adsorption process were analyzed. The results showed that the pH value of acetic acid solution with the concentration of 1.75 mmol / L ~ (-1) could be increased from 3.73 to 4.5 ~ (5) when the voltage was 0.9 V, the plate distance was 1 cm and the flow rate was 21. 5 mL 路min ~ (-1). The removal rate was over 95%. It was feasible to eliminate the accumulation of acetic acid by electroadsorption. The isothermal adsorption process accords with the Freundlich equation and the adsorption process accords with the first-order reaction kinetics equation. The results are of great significance for the optimization of anaerobic digestion process for hydrogen production.
【作者单位】：泰山医学院化工学院;
【基金】：国家自然科学基金资助项目(21501130) 国家大学生创新计划项目(20150439051) 泰安市科技发展计划项目(2015GX2039)
【分类号】：X781

【相似文献】