Degradation Of Printing And Dyeing Wastewater Using Potassium Ferrate And Ozone

The extile wastewater was of complicated component,by a high content of refractory organic pollutants,high colority,high chemical oxygen demand and salt content,traditional physicochemical,biochemical treatment process was difficult to discharge some wastewater,color degradation was particularly difficult.Strengthen the treatment process of extile wastewater,research new treatment technology to achieve the demand of discharge to reach standard of wastewater discharge and reclaimed water reuse.The combination technology of potassium ferrate and ozone is a new kind of wastewater process,it utilizes the oxidizability and flocculability of potassium ferrate,the synergism of potassium ferrate and ozone,destroy the chromophoric groups,open the aromatic ring to produce the degrade products of smaller molecular weight and colorless,and even become to CO₂ and H₂O,achieve the purpose of decoloration and degradation of organic matter.Comparison the decoloration and COD_Cr degradation of 100 mg/L reactive red X-3B dye wastewater by potassium ferrate alone,ozone alone and potassium ferrate combined ozone,the results showed that with the combined process 4 minutes,the decoloration removal entirely and the COD_Cr removal 46%.the efficiency of potassium ferrate combined ozone was better than potassium ferrate alone and ozone alone.Verify the synergistic effect of potassium ferrate combined ozone.Using potassium ferrate combined ozone to degradation three types of reactive dyes and acid dyes,reactive dyes could decoloration more than 95%within 10 minutes.The degradation of reactive dyes was faster than acid dyes.In the same type of dye,the degradation rate was anthraquinone dye＞monoazo dye＞disazo dye.Generally speaking potassium ferrate combined ozone for decoloration of dye wastewater was very rapidly and had superiority in degradation efficiency and processing time.The paper confirmed the treatment of potassium ferrate combined ozone had synergistic effect obviously,high efficiency,high treatment efficiency,small floor area,decomposes quickly and its,less energy consumption,improve the biodegradability of dye wastewater,suitable for the pretreatment of extile wastewater.