Treatment Method Of Aniline Wastewater

Aniline is an important organic chemical material. It is widely used in thepharmaceutical industry, printing and dyeing industry, agriculture and other industries.Because aniline wastewater has a strong biological toxicity and readily biodegradable, it ispollute the environment and water very serious. With the development of industry, moreand more aniline wastewater was discharged into the environment. The treatment ofaniline wastewater aroused more and more attention of the relevant departments. In orderto reduce the pollution to the environment of aniline wastewater and protect theenvironment, effective management of aniline wastewater has become a worldwideproblem which needs to address urgently of the environment protection field. In this thesis,we use the self-made visible light response of nickel-titanium composite metal oxide as aphoto catalyst. We use chlorine dioxide coalition photo catalytic treat the anilinewastewater. The results of aniline wastewater treatment were compared to the results ofindividual photo catalytic oxidation technology, individual chlorine dioxide oxidationtechnology and Fenton technology. The mechanism of coalition treatment was studied andexplored. The main work is as follows:In this study, the nickel-titanium composite metal oxide of the visible light responsetype was synthesis by the dynamic urea. We researched that how the influencing factors ofdifferent nickel-titanium feed ratio, roasted at different temperatures and different roastedduration affected the structure of the catalyst and verified the photo catalytic activity of thecatalyst. The experiments show that: the catalysts were prepared under various conditionsall have visible light response. We got the highest catalytic activity under the conditions offeeding ratio5:1of nickel and titanium molar,10h of crystallization duration and roastedat600℃for3hours.The study found that: treatment of aniline wastewater by the combination of chlorinedioxide and visible light photo catalysis can play their respective advantages. Chlorinedioxide can quickly oxidize aniline. At the same time, the intermediates were furtherdecomposed to the small molecule compounds in the role of the photo catalysts. That canpromote the reaction to the positive direction. The combination of chlorine dioxide andvisible light photo catalysis can both reduce the amount of chlorine dioxide and make thephoto catalysts more effective for the degradation of the refractory chlorine dioxideoxidation intermediates. That improved the utilization of the photo catalysts and at the same time played a synergistic effect.For the aniline wastewater of mass concentration of50mg/L, the optimum processconditions of the combination of chlorine dioxide and visible light photo catalysistreatment approach is that: under the reaction pH9, photo catalyst dosage0.5g/L, chlorinedioxide dosage of the quality of chlorine dioxide with aniline of4:1and the reactionduration4hours. At this point, the aniline removal rate could reach93.1%and the CODremoval rate was52.8%. But under the same reaction conditions, the aniline removal rateof the individual photo catalytic oxidation technology was only57.6%, and the CODremoval rate was only22.1%. Under the same reaction conditions, the aniline removal rateof the individual chlorine dioxide oxidation technology was67.8%, and the COD removalrate was18.9%. To achieve the same treatment effect of Fenton oxidation with thecombination of chlorine dioxide and visible light photo catalysis, we should add0.3%hydrogen peroxide11.00mL and0.01mol/L ferrous sulfate5.26mL in each200mLaniline wastewater.