Experimental Research Of Spouted Bed Particulate Electrodeposition On Treatment Of Wastewater Containing Copper And Zinc

With industrial production and the rapid development of urbanization,EleetroPlating,mining,metallurgy,ehemiea lindustry produce large amounts of Wastewater containing copper and zinc.If these copper-containing wastewater is not treated and discharged directly,it will not only cause the waste of resources and would cause great harm to the environment and human health.As a result,the treatment of organic wastewater has been an urgent problem to be solved.The main purpose of this paper is to choose a way to deal with or pretreatment the wastewater containing copper and zincand on this basis,recycle the available copper in wastewater.This article describes the sources and hazards of the heavy metal waste water and the research of treatment technology to the heavy metal wastewater in this stage.Integrate the pros and cons of the various approaches and the purpose of this re search,we select the electrodeposition method ultimately.Electrodeposition is a method to use current to make the heavy metal ions deoxidize and separate out in the cathode in order to reduce the content of metal and recycling them.This method not only avoids secondary pollution caused by the large aomunts of sludge produced by electrodeposition,but also can well recycling the metal resources in the water,The economic and environmental benefits a lot.This experiment use Spouted Particulate electrodeposition to treat the copper and zinc mixed wastewater.This method changes the previous way to treat heavy metal waste water by electrolysis result in low efficiency,low current efficiency,serious corrosion to metal,concentration polarization defecting obvious.Use the recycling particulate as electrodes to deoxidize metal ions into metals by the current.Laboratorys take manual configurationed simulated wastewater as studying object,systemically researched when at different conditons like pH,current,temperature,whether under the same conditions of nitrogen inlet,after 8 hours of electrodeposition the recovery rate of copper ions and zinc ions and their current efficiency,through analysing the change of the concentration of dissolved oxygen in the electrodeposition process,so as to obtain the best conditions of electrodeposition.When the concentration of copper wastewater is 1000mg/L,the concentration of zinc wastewater is also 1000mg/L,The experimental results show that:(1)High PH leads to Turbid electrolytes,hydroxide precipitats,do not conducive to metal recycling;and when PH is low,the concentration of H+ increased,affect the efficiency of electrodeposition.so the best PH is 3.5.(2)In a certain range,the current size is in proportion to metal electrodeposition efficiency,also proportional to the total current efficiency,but when the current is increased,due to high increased water electrolysis,current efficiency begin to decline,so the current can not be too high,considering the energy efficiency ratio,the choice of deposition current is 15A.(3)The temperature rise will cause the metal return dissolution rate increased,but can reduce the dissolved oxygen in the electrolyte,due to the influence of dissolved oxygen is less than the influence of metal return dissolution rate,so with the increase of temperature,deposition rate is declining.(4)Inleting nitrogen can reduce the dissolved oxygen content in the electrolyte and reduce metal corrosion on one hand,on the other hand it can play a role of stirring,weaken the phenomenon of concentration polarization in the cathode.Therefore,inlet nitrogen can greatly improve the recovery rate of metal and the total current efficiency.Through experimental research,when using Spouted bed particulate electrodeposition to treat Wastewater containing copper and zinc,the best conditions of electrodeposition is when pH is 3.5,current is 15A,the temperature is 25 ℃,and Inleting nitrogen.Under this condition,the removal rate of copper ion can be close to 100%,the removal rate of zinc ions can reach 75.63%.