低温等离子体协同填料床吸附净化甲醇废水

发布时间：2018-06-09 04:29

本文选题：低温等离子体 + 填充床　；参考：《化工学报》2017年06期

【摘要】：采用低温等离子体协同填料床吸附强化氧化降解高浓度甲醇废水。研究表明单独采用4A分子筛、陶粒、陶瓷Rasching环和γ-Al_2O_3不同填料均可吸附废水中甲醇,但较易达到吸附饱和,其中4A分子筛的吸附速率和平衡吸附量优于其他3种填料。单独采用多针板式介质阻挡放电低温等离子体技术,化学需氧量(COD)降解率随放电时间和放电电压增加而增大。采用低温等离子体协同填料降解甲醇废水优于单一净化过程,协同初始阶段以吸附为主,随放电时间延长以等离子体降解反应为主,液相和填料吸附的甲醇同时被等离子体活性基团逐渐氧化降解,最大降解率达90%以上。单独填料吸附过程符合准二级吸附动力学方程。低温等离子体对COD降解反应级数随污染物浓度降低和反应时间延长逐渐增大。低温等离子体协同填料吸附对降解过程相互影响,等离子体活性基团对液相和固相吸附的污染物都有一定的活化作用。填料的吸附作用和等离子体氧化作用会不断改变液相中的污染物浓度与·OH浓度比值,降解过程宏观反应动力学级数随着液相中甲醇浓度降低而逐渐增大。
[Abstract]:High concentration methanol wastewater was degraded by low temperature plasma combined with packed bed adsorption enhanced oxidation. The results showed that 4A molecular sieve, ceramic Rasching ring, ceramic Rasching ring and 纬 -Als _ 2O _ 3 could adsorb methanol in wastewater alone, but it was easy to reach adsorption saturation. The adsorption rate and equilibrium adsorption capacity of 4A molecular sieve were better than those of the other three fillers. The degradation rate of COD increases with the increase of discharge time and discharge voltage by using multi-needle plate dielectric barrier discharge low temperature plasma technology. The treatment of methanol wastewater with low temperature plasma and filler was superior to that of single purification process. The main process was adsorption at the initial stage and plasma degradation reaction with the prolongation of discharge time. The methanol adsorbed by liquid phase and filler was oxidized and degraded by plasma active group at the same time, and the maximum degradation rate was over 90%. The adsorption process of single packing accords with the kinetic equation of quasi-second-order adsorption. The degradation order of COD by low temperature plasma increases with the decrease of pollutant concentration and the prolongation of reaction time. Low temperature plasma synergistic packing adsorption affects each other in the degradation process. Plasma active groups can activate both liquid and solid phase adsorbed pollutants. The adsorption of fillers and plasma oxidation will continuously change the ratio of pollutant concentration to OH concentration in liquid phase. The kinetic order of macro reaction in the degradation process increases with the decrease of methanol concentration in liquid phase.
【作者单位】：安徽理工大学地球与环境学院;安徽理工大学化学工程学院;
【基金】：安徽省科技攻关项目(1301042130) 安徽省国际科技合作项目(12030603003)~~
【分类号】：X783

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