Recycling method for pharmaceutical wastewater

Abstract

The invention provides a recycling method for pharmaceutical wastewater. The method comprises the following steps: after the raw biochemical effluent water is softened by sodium hydroxide and sodium carbonate, the softened water enters a subsequent reaction tank, a coagulant is added for a coagulation reaction, PAM is added for a flocculation reaction, the effluent water is subjected to solid-liquid separation through a solid-liquid separation device, the supernatant liquid enters a pH adjustment tank, and the sludge enters a sludge tank; and the effluent water subjected to pH adjustment enters an advanced oxidation device, the advanced oxidation effluent water enters a middle water tank to be stayed for a period of time, the effluent water enters a biochemical tank for a denitrification reaction, the biochemical sludge enters a sludge concentration tank, the produced water is treated through a sand filter and a security filter, the treated water enters an ultrafiltration system, the water after ultrafiltration enters a reverse osmosis system, the reverse osmosis produced water is reused, and the concentrated water is discharged after reaching a wastewater discharge standard. The method can deeply treat the pharmaceutical wastewater and reuse the reclaimed water, and has obvious economic, social and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for recycling pharmaceutical wastewater. Background technique [0002] Compared with other industries, the pharmaceutical industry has a wide variety of products, complex processes, and different production processes for different products. Therefore, wastewater from pharmaceutical factories is a high-concentration organic wastewater that is difficult to degrade. It has large water volume, high salinity, high chroma, and is difficult to degrade. The discharge of wastewater from the pharmaceutical industry has a huge impact on the surrounding environment, especially in central and western China. In order to save water, pharmaceutical factories are encouraged to reuse reclaimed water, but the biochemical effluent has high COD, high chroma, ammonia nitrogen And total nitrogen, total dissolved solids are not up to the standard for reclaimed water reu...

AI Technical Summary

Problems solved by technology

[0005] 1. Coagulation sedimentation/air flotation method, using agents such as polyaluminum chloride (PAC) and polyacrylamide (PAM), to remove insoluble COD and suspended solids (SS), but this method is difficult to achieve Stable emission standards or reuse standards

[0006] 2. Fenton method, the market has strengthened the traditional Fenton’s treatment effect (Fenton-like method) through various methods, and improved the efficiency of degrading organic matter, but the required oxidants or catalysts are often more expensive and generate sludge. The sludge in the phar

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