The Degradation Of Azo Dyes Acid Orange By Iron-biochar Micro-electrolysis System

To maintain the survival and development of human society, water resources isan important material foundation. With the development of modern industry, waterpollution is a growing problem. Especially industrial dye wastewater with a highconcentration of organic matter, toxic, high color, complex composition, refractoryand other characteristics, is a typical refractory organic wastewater. At the same time,with the increasingly stringent urban sewage discharge standards formulated by thestate, dyeing wastewater become the focus of social concern. Conventionalwastewater treatment technology is difficult to achieve the discharge standards, soresearching and development an efficient, economical and suitable for dye wastewatertreatment technology for printing and dyeing industry wastewater treatment has apositive and far-reaching significance.The biochars which are porous, low density carbon rich material, are biologicalresidues combusted under low oxygen condition after the high temperature oxidation.Initial application in improving the quality of soil, keeping water and fertilizer andother ecological areas. Foreign scholars found the biochar and activated carbon withhigh similarity through structural characterizationIn this dissertation, one typical dyestuffs, Orange II, was chosen as the researchobject, The degradation of azo dye wastewater by iron-biochar micro-electrolysissystem. Through the single factor condition experiment, the optimal reactionconditions are as follows: for50mL the Orange II dye wastewater with theconcentration of20mg/L, iron powder dosage was0.2g, initial pH2.5, ironbio-carbon mass ratio of2:1, the reaction time was60min, the Orange II chromaremoval rate reached73.8%, and the reaction time was120min, the removal rate of94.1%.Detecting the change in the surface structure of the biochar before and afterreaction by Fourier transform infrared spectroscopy and scanning electron microscopy.After four times recycling of biochar, the surface porosity was partially cloggedthrough the characterization of the surface structure. The micro-electrolysis capacity was reduced by7.33%, still had a high activity.Through the whole process, compared biochar with activated carbon, showingthat the experimental results of the two had little difference. in this experiment, theactivated carbon with expense activation process can be replaced by the biochar withlow cost.