Study On Treatment Technique Of Magnetic Fluid Apply In Printing And Dyeing Wastewater

With the rapid development of industry, large quantities of industrial wastewater, especially the printing and dyeing wastewater, is discharged into our environment. This situation brings serious threat to humanity, so effective methods to treat the industrial wastewater is badly needed. According to the document, it is introduced that a kind of new technology in printing and dyeing wastewater treatment——application of magnetic fluid in printing and dyeing wastewater.At first, this research inspected outside influence factors and experimental conditions on the impact of magnetic fluid to determine the appropriate treatment of printing and dyeing wastewater stability of the process conditions. At the same time the amount of magnetic fluid, the magnetic intensity, stirring time, flow rate and other factors on effects of printing and dyeing wastewater treatment were researched, and determined the printing and dyeing wastewater disposal effect good technological conditions.The main results of this research were as follows:1. When the mol proportion between Fe3+ and Fe2+ is 3:2, the dosage of surfactant is between 0.4 and 0.5 times of the quantity of ferrous, after the alkali joins the control response pH value is 11, when wraps the magnetic pellet the control response pH value is about 5, the temperature control in 80℃, and the heating-up time is about 60 minutes, the effect of enwrap is best, and the size of magnetic nanoparticles is small, the magnetism of magnetic nanoparticles is strong. And the processing printing waste water's effect is best, the waste water CODCr elimination rate may reach 88%, the chromaticity elimination rate may reach 95%.2. When the proportion between magnetic fluid and wasted water is more than 1:10, the stirring time is five minutes, the decrease of CODCr is most, and the effect of decolouring is best. And when the magnetic intensity is about 160mT, the subsidence of magnetic fluid is fastest.3. Under the low speed of flow, the magnetic fluid processing printing and dyeing wastewater's effect is better than under the high flow rate the processing effect. When the CODCr of the raw water increases from 500mg/L to 1500mg/L, after adding magnetic fluid, the CODCr of the treated water is always about 169mg/L.