Experiment Study Of A Three-dimensional Electrode Reactor In Polyester Fiber Wastewater Treatment

With the rapid development of the economy and the industry,the treatment with industrial wastewater has been paid more and more attention.The treatment with polyester fiber wastewater is a difficult problem in the field of wastewater treatment.Polyester fiber wastewater has high concentration of organic matter,high acidity,pungent odor,and it is extremely serious to directly let wastewater into natural environment.So the treatment of polyester fiber wastewater is the key to the long-term development of the fiber industry.Because the traditional processing method has many imperfections,it is necessary to develop to a new method.The advance oxidation processes is known as environmentally friendly method,not only high efficiency and low energy consumption.The purpose of this paper is to provide the theoretical guidance for the electrochemical reaction system in the future,and in order to achieve the goal of high efficiency and low consumption,then put into production.In order to discover a high-efficiency and low consumption method for advanced treatment with polyester fiber industrial wastewater,three-dimensional electrode oxidation method was used to treat with polyester fiber wastewater in this paper.The operating parameters of three-dimensional electrode reactor were optimized,in addition,the pH,current density,electrolysis time,polar plate spacing,the carbon filling ration and duty cycle have an effect on COD removal and the energy consumption.Then,response surface analysis experiment was used to optimize the process of three dimensional electrode reactor.Based on these researches,a rapid and simple method for COD measurement is studied.The optimized operating parameters determined by single factor experiments are as following:pH=6,the COD removal was the maximum 45%and the energy consumption was the lowest 150 kWh/kg COD;current density was 10mA/kg,the COD removal was 55%,and the energy consumption was 100kWh/kg COD;electrolysis time was 30min,the COD removal was 45%,and the energy consumption was 100kWh/kg COD;polar plate spacing is 10cm,the COD removal was 46%,the energy consumption was 70kWh/kg COD;carbon filling ratio is 50%,the COD removal was 47%,the energy consumption was 70kWh/kg COD;duty cycle was 0.4,the COD removal was 42%,the energy consumption was 60kWh/kg COD.Then,analysis by Design-expert.V10.0 software,obtained the optimal COD removal was the maximum 58.593%conditions as following:pH=5.349,current density=20mA/cm2,electrolysis time=30.076min,polar plate spacing=9.695cm,carbon filling ration=70%,duty cycle=0.446;and obtained the optimal energy consumption was the lowest 37.612 kWh/kg COD conditions as following:pH=6.418,current density=10mA/cm2,electrolysis time=35.916min,polar plate spacing=8.632cm,carbon filling ration=20%,duty cycle=0.411.Considering the two evaluation indexes,the optimal process parameters were determined:pH=6.115,current density=20mA/cm2,electrolysis time=29.291min,plate spacing=10cm,proportion of carbon=70%,duty cycle=0.451.In order to save time in the experiment,a electric heating constant temperature drying box was used to heating the water sample in this paper.By contrast,heating water sample 20min by electric heating constant temperature drying box,the results show that the two methods had no significant differences on COD removal measurement.