The special characteristics of pharmaceutical industry lead to a lot of complex, toxic and difficult to degrade organic compounds in the wastewater. This kind of wastewater generally contains high salt and organic matter. These special properties make pharmaceutical wastewater a kind of wastewater which is difficult to treat in the water treatment industry. Pharmaceutical wastewater mainly includes antibiotic production wastewater, synthetic drug production wastewater and washing and washing wastewater of various preparation processes. These wastewater are generally complex, with high content of organic matter, deep toxicity and chroma, and poor biochemical property, so the requirements for wastewater treatment chemicals are higher. It is generally recommended to use polyacrylamide with higher ionic degree, which has better effect for wastewater with high organic matter. At the same time, it is also necessary to use inorganic flocculants such as polyaluminum chloride to help better decolorization and flocculation.

The methods of polyacrylamide treatment of pharmaceutical wastewater generally include the following links: chemical processing, chemical treatment, biochemical treatment and other methods, and are widely used in wastewater treatment. Polyacrylamide products are widely used in pharmaceutical wastewater pre-treatment and post-treatment process, and the effect is better when combined with polyaluminium chloride and polyferric sulfate.

Coagulation is a common physicochemical method in pharmaceutical wastewater treatment. Coagulation is used to separate the particles that lose charge, contact each other by stirring, flocculation to form flocs, so as to facilitate precipitation or filtration. Coagulation treatment can not only effectively reduce the concentration of pollutants, but also improve the biodegradability of wastewater. In case of biochemical sludge treatment, Lvyuan Environment Group Co.,Limited suggests to use cationic polyacrylamide with higher ionic degree.. When the concentration of organic matter is very high, it is better to choose the ionic degree of 50% ≤ 60%, and the former stage is electrolysis or flotation. According to the sewage quality, the key technical index is to judge the choice of flocculant by pH value. When pH is less than 7, non-ionic polyacrylamide is often used as coagulant aid or sludge thickening precipitant. If the pH value is greater than 7, anionic polyacrylamide is commonly used.