Common Treatment Process of Pharmaceutical Intermediate Wastewater
2023-11-10
Pharmaceutical intermediate wastewater has the characteristics of high COD, high ammonia nitrogen, high salt and high chroma. The so-called pharmaceutical intermediates are actually some chemical raw materials or chemical products used in the process of drug synthesis. This chemical product does not require a drug production license and can be produced in an ordinary chemical plant. As long as it reaches some level, it can be used for the synthesis of drugs. The synthesis steps are long, the intermediates are complicated, and the molecular structure is stable, so that the composition of pharmaceutical intermediate wastewater is very complex, containing a large number of toxic and refractory organic compounds, as well as Cl-, SO42-and other inorganic salts. It is one of the most difficult points in the chemical sewage treatment industry.
Common processing technology:
Chemical oxidation biochemical method. Due to the high COD and high biological toxicity of pharmaceutical intermediate wastewater, regular microorganisms are difficult to tolerate toxic pollutants in pharmaceutical intermediate wastewater and cannot be directly treated by regular and biochemical treatment. Chemical oxidation can be used for partial removal to reduce its biological toxicity. Chemical oxidation methods include: ozone oxidation, sodium hypochlorite oxidation, ozone-hydrogen peroxide combined oxidation, Fenton oxidation and other chemical reagent oxidation, as well as wet oxidation, electrolytic oxidation, light oxidation, high temperature cracking and other oxidation methods. The disadvantage of this method is that the process is long and requires large investment and operating costs.
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