Effect of organic polymers on properties of aggregates of post-coagulation sludge

The study analyzed sizes of aggregates produced in the coagulation process of silica with the use of an inorganic coagulant Al₂(SO₄)₃ and three organic polymers: cationic (Z63), anionic (P2540) and non-ionic (N300). Sizes of the formed flocs were measured with the macroscopic photographic method. The greatest size of the flocs (R=0.77 mm) at a fall rate of V=6.45 mm s⁻¹ was achieved upon the use of the anionic flocculant P2540, whereas the lowest one (R<0.12 mm, V=2.42 mm s⁻¹) as a result of silica coagulation with the non-ionic polymer N300. The high potential of polymers adsorption makes that the aggregates formed are characterized by high stability and a more open structure.

Badano wymiary agregatów utworzonych w procesie koagulacji zawiesiny krzemionki za pomocą koagulanta nieorganicznego Al₂(SO₄)₃ oraz trzech polimerów organicznych: kationowego Z63, anionowego P2540 i niejonowego N300. Wielkość utworzonych kłaczków zmierzono, stosując makroskopową metodę fotograficzną. Najwyższe wymiary kłaczków R=0,77 mm dla szybkości opadania.