With the development of pharmaceutical industry, pharmaceutical wastewater has gradually become one of the important sources of pollution, how to deal with such waste water is a difficult problem in today's environmental protection.
Pharmaceutical industry wastewater mainly includes antibiotic production wastewater, synthetic drug production wastewater, proprietary Chinese medicine production wastewater and various types of preparation process of washing water and washing wastewater four categories. Its wastewater is characterized by complex composition, high organic content, high toxicity, high color and high salt content, especially biodegradable, and intermittent emissions, is difficult to deal with industrial waste water. With the development of China's pharmaceutical industry, pharmaceutical wastewater has gradually become one of the important sources of pollution, how to deal with such waste water is a difficult problem today's environmental protection.
Treatment of Pharmaceutical Wastewater
Pharmaceutical wastewater treatment methods can be summarized as the following: physical and chemical treatment, chemical treatment, biochemical treatment and a combination of a variety of methods, a variety of treatment methods have their own advantages and disadvantages.
1.1 physical and chemical treatment
According to the characteristics of the quality of pharmaceutical wastewater, in its treatment process need to use the physical and chemical treatment as a biochemical treatment pretreatment or post-processing process. At present, the application of physical and chemical treatment methods include coagulation, air floatation, adsorption, ammonia blowout, electrolysis, ion exchange and membrane separation.
1.1.1 coagulation method
The technology is widely used at home and abroad, a water treatment method, it is widely used in pharmaceutical wastewater pretreatment and post-processing process, such as aluminum sulfate and polyferric sulfate for traditional Chinese medicine wastewater. The key to efficient coagulation is the proper selection and addition of excellent coagulants. In recent years, the development direction of coagulant is from low molecular to polymer polymer development, from the single component to the compound type development. Liu, and so on. The removal rate of COD, SS and chroma of waste liquid at pH 6.5 and flocculant dosage of 300mg / L were treated with a highly effective complex flocculant F-1. Reaching 69.7%, 96.4% and 87.5%, and its performance is obviously better than PAC (powder activated carbon), polyacrylamide (PAM) and other single flocculant.
1.1.2 Air float method
Air floatation usually includes inflatable air flotation, dissolved air flotation, chemical flotation and electrolytic flotation and other forms. Xinchang pharmaceutical factory using CAF vortex flotation device for pretreatment of pharmaceutical wastewater, with the appropriate pharmaceutical cooperation, COD average removal rate of about 25%.
1.1.3 Adsorption method
Commonly used adsorbents are activated carbon, activated coal, humic acid, adsorption resin and so on. Wuhan Jianmin Pharmaceutical Factory uses coal ash adsorption - two - stage aerobic biological treatment process to treat its wastewater. The results showed that the removal rate of COD was 41.1%, and the BOD5 / COD value was increased by adsorption pretreatment.
1.1.4 Membrane separation method
Membrane technology includes reverse osmosis, nanofiltration membranes and fiber membranes, recyclable useful substances, and reduced total organic emissions. The main features of the technology is simple equipment, easy operation, no phase change and chemical changes, high efficiency and energy conservation. Zhu Anna and other use of nanofiltration membrane separation of desmopressin wastewater experiments found that both reduce the waste water in the inhibition of microorganisms in the role of microorganisms, but also the recovery of hygromycin.
The treatment of wastewater with high efficiency, easy operation and other advantages and get people's attention, while the electrolysis has a very good decolorization effect. The removal rates of COD, SS and chroma were 71%, 83% and 67%, respectively, by electrolysis pretreatment of riboflavin supernatant.