Pharmaceutical industrial wastewater mainly includes antibiotic production wastewater, synthetic drug production wastewater, Chinese patent medicine production wastewater and washing water and flushing wastewater in the production process of various preparations. Its wastewater is characterized by complex components, high organic content, high toxicity, deep color and high salt content, especially poor biochemical property and intermittent discharge, which is difficult to treat industrial wastewater. With the development of China's pharmaceutical industry, pharmaceutical wastewater has gradually become one of the important pollution sources. How to treat this kind of wastewater is a difficult problem of environmental protection.
The complexity of pharmaceutical wastewater and the high consumption and low efficiency of conventional biochemical treatment process are the most direct reasons why a large number of pharmaceutical wastewater are difficult to treat and discharge up to standard. Therefore, before adopting the traditional process of anaerobic biochemical treatment and the combination of anaerobic and aerobic biochemical treatment, the pharmaceutical wastewater should be effectively pretreated to destroy or degrade the residual drug molecules and antibiotic activity, so as to convert the substances that are difficult to be biodegraded into small molecular substances that are easy to be biodegraded, that is, to eliminate its inhibitory effect on microorganisms and improve the biodegradability of the wastewater, It can greatly reduce the difficulty of subsequent biological treatment.
At present, the applied physicochemical treatment methods mainly include coagulation, air flotation, adsorption, ammonia stripping, electrolysis, ion exchange and membrane separation. Coagulation treatment of pharmaceutical wastewater is a widely used water quality treatment method at home and abroad. It is widely used in the pretreatment and post-treatment of pharmaceutical wastewater, such as polyaluminium chloride and polyferric sulfate. The key of high-efficiency coagulation treatment is to properly select and add coagulants with excellent performance.
In the selection of flocculants for pharmaceutical wastewater, inorganic polymer flocculants are better than inorganic low molecular salt flocculants. Inorganic polymer flocculant is better than inorganic low molecular salt flocculant. In inorganic polymer flocculants, compared with polyaluminium chloride, polyferric sulfate has higher COD removal rate and faster sedimentation rate; However, due to its own color making, its chromaticity removal rate is not as good as polyaluminium chloride(PAC). The inorganic composite polymer flocculant polyaluminium chloride has better sedimentation, higher COD removal rate (up to 47%), and no obvious color making. It is a more superior flocculant suitable for the pretreatment of this kind of traditional Chinese medicine wastewater.
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