Study On Treatment Of Analog Naphthalene Dye Intermediate Wastewater By Catalytic Wet Air Oxidation Combined With SBR

In industry, Naphthalene dye intermediates are generally prepared from Naphthalene,Naphthol or Naphthalene sulfonic acid, through a series of nitration, sulfonation, andreduction processes. A large number of Naphthalene dye intermediates are applied inpharmaceutical industry, printing and dyeing industry and the production of dyes.Therefore, it’s easy to generate wastewater in the production and using process ofNaphthalene dye intermediates. The thesis focuses on the study of Naphthalene dyeintermediates wastewater treatment by Catalytic Wet Air Oxidation and SBR, in which1-naphthol-5-sulfonic acid solution was used as a simulated wastewater.Firstly,1-naphthol-5-sulfonic acid analog wastewater was treated by Catalytic WetAir Oxidation. Through the study of process conditions, the mechanism analysis and thebiodegradability of treated waste water, it’s found that the effect of reaction temperatureand the initial pH on the treatment is significant, the higher the temperature the betterwastewater treatment, it’s suitable for1-naphthol-5-sulfonic acid degradation in aciddegradation, appropriate increasing oxygen partial pressure and stirring rate can accelerateCOD removal rate of the reaction, A certain amount of Mn-Ce catalyst can effectivelyoptimize treatment effect, but the excess catalyst inhibit the efficacy of the catalyst. In thebest process condition: reaction temperature was200℃, oxygen partial pressure was1.6MPa, initial pH was3.0, stirring speed was300r/min, catalyst dosage was0.8g/L, theCOD removal efficiency of simulated wastewater reached about90%, and thebiodegradability could be greatly improved after treatment for2hours. Moreover, LC-MStechnique was applied to derive the degradation pathway of1-naphthol-5–sulfonic acidtreated by Catalytic Wet Air Oxidation.For the improving of the biodegradability, the treated wastewater can be furthertreated, such as biochemical methods. This work treated the wastewater treated byCatalytic Wet Air Oxidation, through SBR reactor. After a month of acclimation, thereactor is stable. In the condition that the influent COD was about1200mg/L, influent pHwas7.0, MLSS was about3100mg/L, the speed of aeration was0.15m3/h, aeration last for6h, precipitation last for45min, the COD removal rate rage from45%to50%.