Research And Optimization Of Performance Of Iron-Carbon Microelectrolysis

Industrial wastewater is an important source of water pollution.Industrial wastewater components are complex,many sewage containing toxic substances,sewage degradation of pollutants in the sewage treatment is the focus of attention.Iron carbon micro-electrolysis with electrode reaction,redox,adsorption flocculation,coprecipitation and other effects,can effectively remove the water in the degradation of organic matter and improve the biodegradability of sewage.This paper focuses on the performance of iron-carbon micro-electrolysis reactor,to optimize process parameters and study reaction kinetics.The oxidation and reduction ability of iron-carbon micro-electrolysis system was studied by artificial water distribution.The effect of various factors on the treatment of iron-carbon micro-electrolysis system was investigated by single factor method and orthogonal method.The optimum process parameters were obtained,the influent pH was 3,the ratio of gas to water was 3:1,the reaction time was 120 minutes,the filling amount of iron and carbon filler was 600 g/L,the COD removal rate was 30.6%.And the process of degradation of COD in iron-carbon micro-electrolysis system was determined as a first-order reaction kinetics.In order to study the stability of iron-carbon micro-electrolysis reactor,the continuous flow test was designed to determine the effect of 72 hours after the continuous operation.After 72hours,COD removal rate began to decrease.In addition,the study about the use cycle and regeneration performance of iron-carbon filler.Experiments show that the stability of iron and carbon filler is good,re-use more than 10 times,the effect of removing COD can still be maintained at 28%or more.For the bonded iron-carbon filler,regenerate with dilute hydrochloric acid and an ultrasonic bath.After the regeneration,iron-carbon filler recovery activity,COD removal rate averaged more than 30%.With the optimal process condition of iron-carbon micro-electrolysis system,the iron-carbon micro-electrolysis system was designed in combination with Fenton method to construct the combined process,and the removal efficiency of COD in water was further investigated.After several experiments,the optimized process parameters were as follows,the influent pH of the iron-carbon micro-electrolysis system was 3,the ratio of gas to water was3:1,the reaction time was 120 min,and the filling amount of iron-carbon filler was 600 g/L.Fenton system water debugging pH to 4,H₂O₂ dosage of 15m L/L,reaction time 75min,precipitation pH value of 9,precipitation time 60min.With these conditions,COD removal rate can reach 67%.The results show that the treatment effect of Fe/C-Fenton combination method is higher than that of iron-carbon micro-electrolysis,and the B/C value of treated wastewater is increased from 0.15 to 0.37.Finally,the reduction ability of iron-carbon micro-electrolysis system was investigated.The NO₃^-wastewater was treated by single factor method.The optimal process was as follows,the ratio of gas to water was 3:1,Reaction time 120min,iron carbon filling capacity of 450g/L,NO₃^-initial concentration of 300mg/L.To study its stability,to determine the continuous operation within 48h,the reduction performance remained stable.