【作者】 吴强；

【导师】 蔡天明；

【作者基本信息】 南京农业大学 ， 环境工程， 2014， 硕士

【摘要】 我国印染行业耗水量巨大,每天的废水排放量达到几百万吨,是工业废水的主要来源之一。由于印染废水中混有大量染料,染料中含有毒的芳香类基团,导致印染废水色度高、难生物降解、污染物成分冗杂和有毒有害。偶氮染料在印染行业使用广泛,橙黄G是偶氮染料的一种,常用于丝绸和布料等的染色。印染废水直接排入江河水体中会对水体中的水生动植物造成毒害,破坏水系的生态环境。臭氧氧化具有氧化能力强和清洁高效等优点,是处理印染废水的有效途径之一;活性炭具有孔壁总表面积大和微孔发达等特点,应用于印染废水处理可行性很高;活性炭/臭氧具备吸附-氧化体系,是一种高级氧化技术。本文以偶氮染料橙黄G作为污染物,进行了臭氧氧化、活性炭吸附和活性炭吸附-臭氧氧化三种方式对橙黄G模拟废水的处理。首先进行了臭氧氧化去除橙黄G的研究,结果显示,臭氧氧化能有效地去除橙黄G,处理效果随着臭氧投加量、pH的升高而升高;一定温度范围内随着温度的升高,处理效果更好,但温度过高处理效果反而下降;橙黄G初始浓度越高,相对去除率下降,绝对去除量上升,臭氧利用率提高;不同金属离子对反应的影响不尽相同,Cu2+对臭氧氧化作用无促进作用也无抑制作用,Co2+对体系的氧化作用具有微弱的促进作用,Mn2+和Fe3+对反应有明显促进作用;表观动力学研究发现臭氧氧化去除橙黄G的反应速率常数k与pH成正相关,当反应温度介于10℃～40℃范围时,k值与温度成正相关,而当温度提高至50℃时,k值下降。接着探讨了活性炭投加量、反应时间和盐度对改性活性炭吸附去除橙黄G的影响,并研究了吸附等温线、吸附动力学和吸附活化能。结果显示,活性炭投加量提高后去除率上升,单位活性炭的吸附量下降;反应开始10min是快速吸附阶段;10min以后去除率的增加慢慢减缓,10～40 min为缓慢吸附阶段;40 min后趋于吸附平衡;活性炭投加量2.5 g·L-1、反应时间40 min,去除率达95.5%;吸附过程符合Langmuir吸附等温方程和伪二级吸附动力学方程,吸附量qt随着温度和浓度的升高而升高,吸附活化能小,主要以物理吸附为主。最后探讨了活性炭投加量、活性炭粒径和·OH捕获剂对活性炭/臭氧体系处理含检黄G废水的影响。结果显示臭氧投加量810 mg·h-1、橙黄G浓度1.0 g·L-1时,最优活性炭投加量为5.0 g.L-1,橙黄G去除率和COD去除率分别能达到83.3%和37.8%;粉末活性炭处理效果优于颗粒活性炭;叔丁醇作为一种羟基自由基捕获剂对反应具有抑制效能。更多还原

【Abstract】 The printing and dyeing enterprises in our country expend large amount of water and the produced wastewater is millions of tons every day which is one of the main kind of industrial wastewater.Due to the exist of large number of dye containing toxic aromatic groups in printing and dyeing wastewater,the printing and dyeing wastewater is having high chromaticity,difficult to be biodegraded and possessing complex,poisonous and harmful composition.Azo dye is widely used in printing and dyeing industry.Orang G(OG)is one of the azo dye and is usually used for dyeing of silk and cloth,etc.If the printing and dyeing wastewater is discharged into river directly,it can poison the aquatic animals and plants in the river and destroy the ecological environment in water.Ozone oxidation has some advantages such as high oxidation ability,cleanliness and high efficient which is one of the effective ways to treat printing and dyeing wastewater.Activated carbon has high specific surface area for total pore and micro-pore is developed and the feasibility of using activated carbon in printing and dyeing wastewater treatment is very high.AC/O3 has adsorption-oxidation system which is one of advanced oxidation technology.In this paper,azo dye Orange G was used as pollutant and was treated by ozone oxidation,activated carbon adsorption and adsorption-ozonation.First,OG removed by ozonation were researched.The results show that ozone oxidation can remove the OG effectively.The increase of ozone dosage and pH value benefit the removal of OG.The increase of temperature benefits the removal of OG in a certain range,but when the temperature is too high the effect will be opposite.The increase of OG initial concentration benefits the absolute removal amount but goes against the relative removal rate which increases the utilization efficiency of ozone.The effects of different metal ions on reaction are not the same.Cu2+ has no promoting and inhibition effect on ozonation,Co2+ has weak promoting effect and Mn2+ and Fe3+ have obvious promoting effect on ozonation reaction.Apparent kinetics study show that the ozonation reaction rate constant k and pH have positive correlation.When the temperature is in the range of 10 ℃ to 40 ℃,the ozonation reaction rate constant k and temperature have positive correlation,but when the temperature is up to 50 ℃,the k decreases.Second,the effects of activated carbon dosage,reaction time and salt concentration on OG adsorption were studied.The adsorption isotherm,adsorption kinetics and activation energy of adsorption were also researched.The results show that the removal rate of OG increases after the increase of activated carbon dosage,but the adsorption quantity of one unit of activated carbon decreases.The first 10 minutes is the fast adsorption phase;After 10 minutes,removal rate increases slowly,and 10～40 min is the slow adsorption period;After 40 minutes,the adsorption reaches equilibrium.When the activated carbon dosage is 2.5 g·L-1,the removal rate of OG is 95.5%in 40 minutes.This adsorption process follows the Langmuir isotherm equation and pseudo second-order equation.The increase of initial OG concentration and temperature benefit the equilibrium absorption capacity qe.The energy of activation for adsorption is small and the studied adsorption is mainly a physical adsorption process.At last,the effects of activated carbon dosage,activated carbon particle size and ·OH capture agent on AC/O3 system were researched.The results show that when ozone dosage is 810 mg·h-1 and OG concentration is 1 g·L-1,the optimal activated carbon dosage is 5 g·L-1,where OG removal rate and COD removal rate can reach 83.3%and 37.8%respectively.PAC is better than GAC and the ·OH capture agent tertiary butyl alcohol(TBA)can inhibit the reaction.更多还原