Study On The Treatment Of Pharmaceutical Wastewater With Iron-Carbon Microelectrolysis-Fenton-Coagulation Process

Nowdays, the development of the modern pharmaceutical industry is more and more rapid, with resulting a large number of pharmaceutical wastewater has also brought serious threat to the natural environment. This Paper, according to domestic and foreign research status of pharmaceutical wastewater, analysis of a variety of pharmaceutical wastewater treatment technology. Through comparison, the characteristics of the pharmaceutical wastewater with poor biodegradability, high salt content, high CODcr concentration and high chroma, it is difficult to achieve a good treatment effect through a single technology. Therefore, this paper puts forward the method of " Iron-Carbon Microelectrolysis-FentonCoagulation" as the treatment process of pharmaceutical wastewater. Through study on the technology of Iron-Carbon microelectrolysis and Fenton oxidation to determine the optimum process parameters, finally, a set of pilot process was obtained and the effect of the comprehensive treatment of pharmaceutical wastewater were investigated.Treatment of pharmaceutical wastewater by Iron-carbon microelectrolysis is carried out. Through studying and analyzing orthogonal experiment and single factor experiment, the four main influencing factors of reaction time, initial pH value, iron carbon mass ratio and iron carbon dosage were determined. The optimum reaction conditions were the reaction time was 90 min, the initial pH value was 3, the iron carbon mass ratio was 3:1, the iron carbon dosage was 25 mg·L^-1.Treatment of pharmaceutical wastewater by Fenton oxidation is carried out. Through studying and analyzing orthogonal experiment and single factor experiment, the four main influencing factors of reaction time, initial pH value, H₂O₂ dosage and FeSO₄ dosage were determined. The optimum reaction conditions were the reaction time was 80 min, the initial pH value was 3, the H₂O₂ dosage was 30 ml·L^-1, the FeSO₄ dosage was 12.5 mmol·L^-1.The combination treatment process "Iron-Carbon Microelectrolysis-Fenton-Coagulation" combined process for pharmaceutical wastewater treatment by combined operation of pilot test is built to pilot test based on orthogonal experiment and single factor experiment. The results show that after Iron-carbon microelectrolysis treatment, the amount of H₂O₂ dosage should be controlled between 30⁵0 ml·L^-1, the pH value of the effluent should be adjusted to 8⁹ after Fenton oxidation and the optimum dosage of PAM is 7 mg·L^-1. Taking CODcr as detection index, compared with Iron-carbon microelectrolysis, Fenton oxidation and IronCarbon Microelectrolysis-Fenton-Coagulation combination process three kinds of technologies for the treatment of pharmaceutical waste compared to the results. The pilot test shows that when the Iron-Carbon Microelectrolysis-Fenton-Coagulation combination process is used for treating wastewater, the highest removal rate of CODcr was 73.2%, and the treatment effect was much higher than that of single treatment method.Comprehensive analysis drawn, the pharmaceutical wastewater by Iron-Carbon Microelectrolysis-Fenton-Coagulation combination process for processing, the treatment effect can be greatly improved, the selection of pharmaceutical wastewater treatment technology in the future will play a certain degree of reference.