In today's world where water pollution is increasingly severe, we have recognised the necessity of wastewater treatment. Consequently, wastewater treatment has become a crucial process. During this treatment, polyacrylamide has gained widespread popularity as a highly effective water treatment chemical. Today, we shall discuss in detail some key points regarding the use of
cationic polyacrylamide.
When employing cationic polyacrylamide, note that granular forms must not be directly added to wastewater for treatment. It must first be dissolved. The resulting solution is then employed for wastewater treatment. When dissolving cationic polyacrylamide, the water selected should be wastewater. Under no circumstances should wastewater be used for dissolution. Room-temperature water is suitable for dissolving cationic polyacrylamide; heating is unnecessary. Note that water temperature must not be excessively low or high. Temperatures below 0°C will significantly slow dissolution, requiring higher temperatures. Conversely, temperatures exceeding 40°C accelerate degradation, impairing efficacy. Generally, tap water serves as a suitable dissolution medium. The optimal dissolution concentration should be maintained between 0.1% and 0.3%. This equates to adding 1g to 3g of cationic polyacrylamide per litre of water.
During dissolution, particular attention must be paid to ensuring complete dissolution before adding the cationic polyacrylamide to wastewater for use. What factors may cause incomplete dissolution? Operator negligence and lack of operational proficiency can both lead to inadequate dissolution. During preparation, water should first be added to the mixing tank. The mixer should then be activated. Cationic polyacrylamide should be slowly and evenly added to the water for dissolution. Based on the mixing tank's capacity, a reasonable quantity of polyacrylamide should be added. After addition, stirring should continue for a minimum of 30 minutes to ensure complete dissolution. It is important to note that when adding the solution to wastewater, the mixing tank should remain operational to maintain agitation. Ensure the cationic polyacrylamide is fully dissolved. The dissolved polyacrylamide solution should ideally be used promptly, as solutions left standing for more than one day will become ineffective.
