Experimental Study Of Combined Microelectrolysis And Fenton Process On Oily Wastewater Treatment

The oily wastewater emissions increased in recent years with the rapid development of our economy.Aquatic organisms suffered serious damage due to the large oil pollutants which form the oil-water emulsion in water.In present,it is difficult for the effluent from a single treatment process to meet the emission standards.Therefore,an efficient and practical technology for oily wastewater treatment is urgently needed.In order to achieve effective oxidation and degradation of oily wastewater,this study adopted technology combined microelectrolysis with Fenton to deal with oily wastewater.The results showed that the process had good removal effect on emulsified oil.For improving the processing efficiency,this study designed and prepared new packing of microelectrolysis by iron an carbon based on the existing packing components.By many process operations,the optimum component of new packing were determined as iron powder,activated carbon powder,bentonite and ammonium bicarbonate,which mixed as the mass ratio of 57.75:19.25:20:3 with 2h-calcination in 700?.The new packing performed well on compaction resisting with satisfied strength and treatment efficiency.According to the reaction principle of micro electrolysis and Fenton oxidation,the static test of oily wastewater treatment was carried out respectively.The treatment efficiency of iron and carbon micro electrolysis technology 80.2%and Fenton oxidation technology 85.94%was obtained,and the optimal operation conditions of each technology were determined.On this basis,Fenton oxidation treatment of micro electrolysis effluent was carried out to realize the combination of two technologies to improve the treatment efficiency.Experimental research showed that the new iron carbon packing with unique structure and the Fe²⁺which generated during the microelectrolysis combined with Fenton technology can achieve an excellent synergistic effect.The final emulsified oil removal rate can achieve98.73%,better than the above two kinds of technology separate operation results,and the dosage of H₂O₂ was lower.Moreover,the results of dynamic continuous test showed that the micro electrolysis combined with Fenton process was stable,and the removal rate of oil was more than 95%within 30 days.To obtain the optimal process conditions:iron carbon microelectrolysis packing dosage 200g/L,pH value is 3.1,the reaction time is 55 minutes,the best ratio of iron carbon micro electrolysis effluent after treatment,effluent H₂O₂ dosage control in 0.83ml/L,the reaction time is 60 minutes.On the basis of experimental research,the response surface analysis method was used to analyze the significance of the above three processes,identify the significant influencing factors,and optimize the process conditions.A model for the relationship between the dosage of the reaction agent,the pH value,the reaction time and the oil removal rate was obtained by built a multiple regression analysis model to fit the treatment efficiency of oily wastewater by micro electrolysis,Fenton oxidation and micro electrolysis combined with Fenton intensification.The experimental results show that the model has high accuracy,can well reflect the processing effect,and can optimize the process according to practical factors.Moreover,the model can reflect the effect of the technology commendably and it can be optimized according to the actual process factors.This experiment results are beneficial to further study on the new filler research which also have the extreme significance for the oily wastewater treatment application of the micro electrolysis and Fenton engineering technology.