anionic polyacrylamide flocculation and coagulation in water

anionic polyacrylamide flocculation and coagulation in water
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  • Does anionic polyacrylamide improve the coagulation–flocculation process?
  • The use of anionic polyacrylamide had little effect on this cost but improved the coagulation–flocculation process, leading to a significant increase in the settling speed and reduction in the volume of sludge produced. Table 7.
  • Why is anionic polyacrylamide chosen?
  • Anionic polyacrylamide is chosen because the intramolecular electrostatic repulsion between polymer segments forces the polymer chains to adopt a more extended conformation, increasing the efficiency of bridging flocculation.
  • What is the coagulation speed of anionic polyacrylamide?
  • Coagulation speed: 200 rpm. Flocculation speed: 20 rpm when the coagulant was used alone and 40 rpm when anionic polyacrylamide is added, since the flocs formed were larger and heavier and tended to settle at the lower speed. The influence of the settling time was also studied, the duration of the experiments being fixed at 60 min in all cases.
  • Can anionic polyacrylamide be used as coagulant aid with ferric sulphate and polyaluminium chloride?
  • It is important to point out that the optimal coagulant dose can be reduced when anionic polyacrylamide is used as coagulant aid with ferric sulphate and polyaluminium chloride, thus decreasing treatment costs. 3.10. Mechanisms of the process