Research On The Treatment Of Dye Water By Macrocyclic Amido Iron Complex Catalytic Oxidation Process

With the development of textile industry,the quantity of dyeing wastewater increased quickly and the pollution of water were more and more serious in the past few years.Common methods used in wastewater treatment have many problems such as high energy consumption,secondary pollution and so on.To solve these problems,We used macrocychc arrudo iron complex and H2O2 to oxidize dyes and other organic pollutants in dyeing wastewater.In the research work,we investigated the treatment efficiency and the mechanism of reaction.In this text,we chose 18 kinds of dyes from 4 categories which were water soluble and investigated the treatment efficiency under the best reaction condition.The results showed that the removal of color of acid dyes were the best and all of them were greater than 90%.The removal of TOC and COD of direct dyes were all the best and they were greater than 40%.All indicators of basic dyes were the worst of 4 categories.The treatInent efficiency of dyes of the same categories were different too.The main reason of this phenomenon is the difference of molecular structure of these dyes.Then,we use this method to treat mixed dye wastewater and wastewater taking from textile factories.The results showed that the removal of TOC and COD of direct dyes were all the best and they were 46.1%and 47.3%.The removal of TOC and COD of basic dyes were the worst and they were 36.1%and 28.0%.Compare with the treatment efficiency of 18 kinds of dyes,we find that there’s no interrelationship between dyes in wastewater.On the other hand,we could also treat wastewater taking from textile factories well.But there’s difference in treatment efficiency of different kinds of wastewater taking from textile factories due to chelating agent and heavy metal ion.At last,we built the kinetic model of the oxidation-reduction reactions of dyes and chose reactive blue M-R as the object of study.We calculated the reaction rate constant under different reaction conditions and verified the rationality of the kinetic model.When the reaction was conducted under the conditions:T=25 ℃,pH=11.5,the reaction rate constant of two steps were ki=2.080×l05,k2=16.21,The activation energy of two ste-ps were Eal=2.733 kJ/mol,Ea2-10.16 kJ/mol.