【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4.5⁵.5,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。更多还原

【Abstract】 Acetic acid is an important metabolic compound produced during anaerobic digestion of organic wastes for hydrogen production. Removal of acetic acid is of great significance for eliminating product inhibition and improving hydrogen productivity. In this paper,for the first time,electro-sorption technology was applied to remove acetic acid,and its feasibility was explored. Using activated carbon fiber as the electrode material,the effects of voltage,electrode distance,flow rate,and initial concentration were studied for the electro adsorption removal of acetic acid. The isotherm and kinetics characteristics of this process were analyzed. The results showed that at voltage of 0. 9 V,plate spacing 1 cm,and flow rate 21. 5 m L·min^-1; the pH of an acetic acid solution at a concentration of 1. 75 mmol·L^-1,was raised from pH 3. 73 to the optimum range 4. 5 to 5. 5 favored by hydrogen-producing bacteria. The removal rate reached > 95%. It is feasible to prevent the accumulation of acetic acid through electro adsorption,and the isothermal adsorption process fit well with the Freundlich formula（ i. e.,the adsorption process is in compliance with the first-order kinetic equation）. These results are significantly meaningful for optimizing the process of hydrogen production through anaerobic digestion.更多还原