When the polyacrylamide concentration is 0.2%, the temperature is 25~30 degrees, for the mechanical sludge, suitable polyacrylamide ionic degree 55%~60%, molecular weight 15 million cationic organic polymer polyacrylamide, dosage is 100g/m3, dehydration rate is 69%~74%, 49%~50%; For the sludge of municipal sewage treatment plant, the suitable flocculant is cationic organic polymer polyacrylamide with ionic degree of 60%~100% and molecular weight of 3 ~6 million. The dosage is...