【正文】 r. In this paper a theoretical model bining the fluid dynamic and reaction kiic parameters is proposed for predicting the destruction rates of organic pollutants in a semi2batch stirredtank reactor by ozonation. A simple expression for the enhancement factor as our previous work has been applied to evaluate the chemical mass transfer coefficient in ozone absorption. 2 ,42dichlorophenol (2 ,42DCP) and 2 ,62DCP or their mixture are chosen as the model pounds for simulating , and the predicted DCP concentrations are pared with some measured data. Keywords : dichlorophenol destruction 。臭氧反應(yīng)器的設(shè)計(jì)和進(jìn)程優(yōu)化要求在反應(yīng)器里面有氣體和液體相互轉(zhuǎn)換的模型。 David , 1991），這些反應(yīng)動力學(xué)的應(yīng)用成功率和反應(yīng)器工藝設(shè)計(jì)基本信息沒有得到足夠的重視（ Yue , 1992）。 數(shù)學(xué)模型 1 一個(gè)單一的有機(jī)污染物在水溶液中被臭氧氧化的破壞 當(dāng)臭氧變成冒攪拌釜包含一個(gè)有機(jī)污染物的解決方案 ,無論是氣態(tài)和液態(tài)階段可以設(shè)想充分混合，這個(gè)質(zhì)量平衡為臭氧氣體階段可以表示為如下 (秋 ,1999年 )。 21 英尺 的 pH 范圍 1999(5),這里是采用平均值為 . 增強(qiáng)臭氧本身 在臭氧吸收分解和二階臭氧氧化反應(yīng)原理 ,是一個(gè)簡單的顯式表達(dá)式 ,推導(dǎo)出在我們先前的工作 (程 ,2020),基于表面更新模型 那里 DA和 DB分別為臭氧擴(kuò)散性能和有機(jī) B。它們在 1977年的清潔水法案中被美國環(huán)保署列為 65個(gè)最大污染物。該解決方案每個(gè)實(shí)驗(yàn)的初始體積為 3公升。這是合理的，因?yàn)樵撃Ｐ秃雎粤水?dāng) DCP的氧化接近完成時(shí)臭氧與不確定中間體的反應(yīng)。無論是在圖 1a中預(yù)測的結(jié)果還是實(shí)驗(yàn)結(jié)果，都表明隨著 pH值從 7到 9的的增加， 2,42DCP的破壞率變化很小，這是由于臭氧傳質(zhì)速率的限制。 圖 1,在 2， 42DCP 解決方案中對增強(qiáng)因子和臭氧吸收的預(yù)測 (攪拌轉(zhuǎn)速 : 200 r/min , cA , G,0 = 0. 0002 mol/L , cB ,L ,0 = 0. 0005 mol/L , a = 2 , Sr = 0. 24) Curve No. Key * pH q , L/min k1,L/(mol 對于單一 DCP溶液中的臭氧吸收，通過結(jié)合等式（ 1），（ 2）和（ 3）以及應(yīng)用MATLAB ODE程序的數(shù)字化方法，增強(qiáng)因子 E，在大多數(shù)氣相和液相臭氧中 DCP的濃度， cB ,L , cA , G 能夠從理論上預(yù)知，如圖 1和 2所示。 值得注意的是， Eq。分別是速度的氣相及氣率 ,t 是吸收時(shí)間。眾所周知吸收了大量氣體的溶質(zhì)的轉(zhuǎn)化速率在化學(xué)反應(yīng)中被加強(qiáng)。一個(gè)對我們之前工作中的增強(qiáng)因數(shù)的簡單的表述被應(yīng)用在估計(jì)在臭氧吸收中化學(xué)團(tuán)轉(zhuǎn)化率。 stirred2tank reactor 。 Qiu , 1999) , i. e. cA ,L ≈0 , all the fast ozonation reactions can be assumed to plete within the liquid film. Then the depletion rate of the organic ponent in the liquid phase can be written as (Sotelo , 1990) : where cB ,L refers to the concentration of organic pound B in the liquid bulk , and a is the stoichiometric ratio of the ozonation reaction. In the above two equations the interfacial concentration of ozone cA , i can be expressed as cA , i = cA , G Sr. The solubility ratio of ozone Sr is 0. 21 — 0. 28 in the pH range of 5 — 9 (Qiu , 1999) and an average value 0. 24 is adopted here. A simple explicit expression of the enhancement factor in ozone absorption with ozone self2deposition and a second order ozonation reaction was derived in our previous work (Cheng , 2020) based on the surface renewal model as where DA and DB are the diffusivity of ozone and organic B respectively. k is the second order reaction constant , kd is the first order ozone self2deposition reaction constant. It should be noted that Eq. (2) is valid only if the following condition holds M = Md + M1 [1 ( E 1) /Q] 4. 1. 2 Destruction of the mixture of organic pollutants in aqueous solution by ozonation When two or more contaminants are present initially in the liquid