化工学报2017，Vol.68Issue(6)：2546-2554,9.DOI:10.11949/j.issn.0438-1157.20161385
低温等离子体协同填料床吸附净化甲醇废水
Purification of methanol wastewater by non-thermal plasma combined with packed bed adsorption
摘要
Abstract
The purification process of high concentration methanol wastewater intensified by non-thermal plasma(NTP) combined with packed adsorption bed had been investigated. The results showed that the four types of packed bed materials, 4A molecular sieves, ceramsite, ceramic Rasching ring andγ-Al2O3, could adsorb methanol rapidly, but reached the adsorption saturation easily. The adsorption velocity and equilibrium absorption capacity of 4A molecular sieves was better than the others. In the multi-needle-plate DBD (dielectric barrier discharge) non-thermal plasma purification system, the degradation rate of COD increased with increasing discharge time and discharge voltage. The degradation effect of NTP combined with packed bed was better than single purification process. In the initial reaction stage of combination process, the rapid degradation of COD was dominated by packed bed adsorption process. However, NTP played a main role in the degradation process with prolongation of discharge time. The methanol, both in liquid phase and adsorbed in packed bed, had been oxidized by active groups which generated by NTP. The maximum degradation rate of COD was more than 90% in this experiment. The adsorption process of packed bed followed the pseudo-second order adsorption kinetic equation.The reaction order of NTP degradation process increased with the decline of pollutant concentration and the prolongation of discharge time. In the synergistic purification system, the adsorption process of packed bed would be influenced by NTP, and vice versa. The active groups generated by NTP had an activating effect on the contaminant, both in liquid phase and adsorbed in packed bed. Therefore, the concentration ratio of contaminant and hydroxyl radical(?OH) in liquid phase would be changed constantly under the process of packed bed adsorption and NTP oxidation. The reaction order of macroscopic reaction kinetics of synergistic process increased with the decrease of methanol concentration in liquid phase.关键词
低温等离子体/填充床/吸附/甲醇废水/宏观反应动力学Key words
non-thermal plasma/packed bed/adsorption/methanol wastewater/macroscopic reaction kinetics分类
资源环境引用本文复制引用
盛楠,陈明功,孙逸玫,荣俊锋,魏周好胜,徐胤..低温等离子体协同填料床吸附净化甲醇废水[J].化工学报,2017,68(6):2546-2554,9.基金项目
安徽省科技攻关项目(1301042130) （1301042130）
安徽省国际科技合作项目(12030603003).supported by the Anhui Provincial Programs for Science and Technology Development(1301042130) and the International Cooperation Project of Anhui Province(12030603003). （12030603003）
