There are many kinds of pharmaceutical products, which can be divided into four major categories according to their characteristics: antimicrobials, organic drugs, inorganic drugs and Chinese herbal medicines. At present, China's production of commonly used drugs up to more than two thousand kinds of different kinds of drugs using different raw materials and quantities. In addition, the production process and synthesis route of different drugs are quite different. Especially in the process of pharmaceutical purification and refining, the process methods used are different. In order to improve the medicinal properties of drugs and disease-specific, in the pharmaceutical production process often need to be biological, physical and chemical processes such as synthesis, such as biofermentation of drugs (such as antimicrobials, etc.), need to be late chemical synthesis and improve its medicinal properties. Therefore, the composition of the pharmaceutical production process and its wastewater is very complex.
Pharmaceutical wastewater treatment method
1, coagulation and precipitation method
Coagulation and precipitation method for the physical and chemical wastewater treatment of the most important and one of the methods. This method is mainly through the effective biological degradation of wastewater, to achieve the effect of reducing the content of pollutants in wastewater to achieve the purpose of sewage treatment. The production of large amounts of chemical sludge is the main disadvantage of this treatment method, but the high removal rate of salt, ammonia and nitrogen content is the biggest advantage of the coagulation and precipitation method.
2, flotation method
Flotation method is also known as air flotation method, the main treatment in the practical application of electrolytic air flotation, bulk air flotation and dissolved air flotation method of these three. First of all, through the chemical method to produce a large number of micro-bubbles in the water, and then make the wastewater concentration of similar pollutants adhere together and float to the surface of the water, and finally make the wastewater solid-liquid to realize the effective separation, so as to fundamentally reduce the content of pollutants in the water.
3, membrane separation method
Membrane separation method is the main tool is the membrane, through the membrane to the solvent separation, this method is not only for polyphenol pharmaceutical wastewater ethanol recovery has a very obvious effect, but also can be effectively retained polyphenol mixture.
4, anaerobic biological treatment method
Anaerobic biological treatment method is mainly for the treatment of anaerobic organisms, suitable for high concentration of organic pharmaceutical wastewater treatment. The main operation method is divided into upflow anaerobic sludge bed method, hydrolysis ascending sludge bed method and anaerobic folded plate reactor method. When using this method alone, in order to achieve better results, it is also necessary to follow the aerobic biological reprocessing.