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Another major application of chemical flocculation in the treatment of pharmaceutical wastewater is to purify and recover the effective components in wastewater. Since the 1950s, the purification of pharmaceutical wastewater has mainly focused on the two processes of water extraction and alcohol precipitation, and isoelectric point heating. However, the traditional purification methods have a large loss rate of active ingredients, and the alcohol precipitation time is long and the cycle is long. Problems such as difficulty in recycling lead to excessive costs, and the equipotential point heating process also has defects such as high energy consumption and low efficiency, which need to be improved urgently. In the two-step fermentation process for preparing vitamin C, the fermentation broth contains a large amount of drug culture medium and bacterial protein. The protein removal method using isoelectric point heating not only consumes a lot of energy, but also has a low extraction yield.

It is worth noting that the chemical flocculation of the fermentation broth should be properly combined with biological flocculation. The local high concentration of the fermentation broth should be used to form the core of the yeast biological flocculation, which can increase the flocculation effect and save the amount of flocculant. Studies have shown that under the same conditions, the flocculation of the isolated cell wall is not different from that of the intact cell. This shows that the formation of the yeast biological flocculation core depends on the nature of the cell wall, and it is the electrostatic repulsion between the cells The special bonding force between neighboring cells competes with each other and is closely related to the type and concentration of divalent ions in the system.

In general, the application of flocculation technology in the purification and recovery of fermentation broth is mainly to use the self-flocculation performance of the fungus or to induce the fungus to flocculate under certain conditions to increase the concentration of the target product. In the subsequent processing stage, the solid particles such as fine colloids, bacterial cells, cell debris, and residual medium are combined into larger particles by adding flocculants, which makes the solid-liquid separation of the fermentation broth easier to achieve and further improves. The concentration of the target product. Therefore, the economic and efficient purification treatment of pharmaceutical wastewater should be a combination of biological flocculation and chemical flocculation, but mainly chemical flocculation, forming different types of impurity flocculation cores at different stages of flocculation to achieve the purification of effective pharmaceutical ingredients, Recycle.

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