Separation And Purification Of High Sodium Potassium Salt And High Organic Wastewater

With the rapid development of modern pharmaceutical industry technology,more and more kinds of drugs are used,the number of raw materials is increasing,and the production process is becoming more and more complex.The content of organic substances and salts in pharmaceutical wastewater is high,there are many toxic substances,and the amount of organic solvents is large.The types and quantity of pollutants are also on the rise,the composition is complex,and the degradation is difficult.According to the characteristics of wastewater produced by a pharmaceutical factory in Shandong Province,this paper seeks a process route with low investment and operation cost and good treatment effect.Through decolorization,centrifugation,electrolytic oxidation and other organic-inorganic separation unit technology of basic exploration.According to the comprehensive consideration of the removal rate and economic applicability of the two main indexes of COD and chroma,the oxidation process of pharmaceutical wastewater is determined,and the experimental conditions of precision treatment are determined.So that it can meet the current discharge standard of chemical synthesis pharmaceutical wastewater in pharmaceutical industry,and provide certain theoretical basis and process optimization ideas for the exploration of cost-effective high concentration pharmaceutical wastewater treatment process.After pretreatment of raw water by acid analysis,high salt and high organic pharmaceutical wastewater was treated by iron carbon micro electrolysis technology,and then precision treatment was carried out by electrolytic air flotation.Through a series of single factor and orthogonal experiments,taking cod and chroma removal rate into account,the optimal experimental conditions obtained by iron carbon micro electrolysis are reaction time,coagulation pH value,initial pH value,iron carbon dosage,PAM dosage.The optimal experimental conditions for the pretreatment of pharmaceutical wastewater are as follows:the dosage of micro electrolysis packing is500 g/L,the initial pH of the reaction is 4,the reaction residence time is 150 minutes,the coagulation pH is 9,and the dosage of PAM is 1 mg/L.The removal efficiency of COD and chroma was 45%and 46%respectively.Subsequently,electrolytic air flotation treatment is carried out.The base material of the electric floating anode plate is Ti,and the coated metal is Ru,IR and Ti,and the cathode is 316 stainless steel plate.The electrolysis time is 120 min,the current density is 266.7 A/m~2,and the electrode spacing is 2 cm,which is the best way to carry out the electrolysis experiment.The removal rate of COD is up to 70%,and the removal rate of chroma is up to 80%.After that,the original high-efficiency multistage evaporation crystallization technology of pharmaceutical factory was used to solidify the pretreated wastewater to form crystal salt and realize the solid-liquid separation of high salt wastewater.The process is economic and feasible,which can provide a new idea for pharmaceutical wastewater treatment.