Pharmaceutical wastewater treatment methods can be summarized as follows: physicochemical treatment, chemical treatment, biochemical treatment and the combination of a variety of methods. Each treatment method has its own advantages and disadvantages. Treatment of wastewater and organic wastewater: cationic polyacrylamide in acidic or alkaline medium shows positive electricity, so it is very effective to flocculate and precipitate the wastewater with negative charge. Coagulation treatment can also be used. The key is to select and add coagulant with good performance properly. In recent years, the development direction of coagulant is from low molecular to polymer, from single functional component to composite.

It is found that the effect of cationic polyacrylamide is better in the treatment of pharmaceutical wastewater after many times of research and test of Lvyuan Environment Group Co.,Limited. If the organic concentration is very high, the polyacrylamide with ionic degree of 50% - 60% or more can be selected. If it is electrolytic treatment or front stage air flotation treatment, it is necessary to judge the performance of flocculant according to the water quality of wastewater and the pH value of key technical index Generally, if pH is less than 7, non-ionic polyacrylamide is often used as coagulant aid or sludge thickening precipitant. If pH is higher than 7, anionic polyacrylamide is better.