發(fā)布時間：2018-06-09 04:29

  本文選題：低溫等離子體 + 填充床�。� 參考：《化工學(xué)報》2017年06期

【摘要】：采用低溫等離子體協(xié)同填料床吸附強化氧化降解高濃度甲醇廢水。研究表明單獨采用4A分子篩、陶粒、陶瓷Rasching環(huán)和γ-Al_2O_3不同填料均可吸附廢水中甲醇,但較易達到吸附飽和,其中4A分子篩的吸附速率和平衡吸附量優(yōu)于其他3種填料。單獨采用多針板式介質(zhì)阻擋放電低溫等離子體技術(shù),化學(xué)需氧量(COD)降解率隨放電時間和放電電壓增加而增大。采用低溫等離子體協(xié)同填料降解甲醇廢水優(yōu)于單一凈化過程,協(xié)同初始階段以吸附為主,隨放電時間延長以等離子體降解反應(yīng)為主,液相和填料吸附的甲醇同時被等離子體活性基團逐漸氧化降解,最大降解率達90%以上。單獨填料吸附過程符合準(zhǔn)二級吸附動力學(xué)方程。低溫等離子體對COD降解反應(yīng)級數(shù)隨污染物濃度降低和反應(yīng)時間延長逐漸增大。低溫等離子體協(xié)同填料吸附對降解過程相互影響,等離子體活性基團對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離子體氧化作用會不斷改變液相中的污染物濃度與·OH濃度比值,降解過程宏觀反應(yīng)動力學(xué)級數(shù)隨著液相中甲醇濃度降低而逐漸增大。
[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 緯 -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.
【作者單位】： 安徽理工大學(xué)地球與環(huán)境學(xué)院;安徽理工大學(xué)化學(xué)工程學(xué)院;
【基金】：安徽省科技攻關(guān)項目(1301042130) 安徽省國際科技合作項目(12030603003)~~
【分類號】：X783

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