2007-04-12 17:26:20 · 2 answers · asked by keru_ganu19 1 in Science & Mathematics ➔ Chemistry
Both types of coagulants are used for removal of suspended solida from the effluents. The primary variables controlling the particulate material removal from the solution are coagulation ,pH and coagulant dose. The paticulate removal is typically accomplished by either charge neytralisation or sweep-floccoagulationwhere an excess of the coagulant is added to enmesh and co-precipitation of particulate material.
The treatment efficiencies for removal of soluble organic matter, turbidity ,and bacteria differs in these two coagulants.Alum performs best in removing turbity,color and bacteria ,but not however effective in DOC removal.Ferric salts are better DOC remover than the alum.
2007-04-12 23:52:49 · answer #1 · answered by sb 7 · 0⤊ 0⤋
Al3+ acts by peptisation whereas Fe3+ chelates.
2007-04-13 03:02:50 · answer #2 · answered by ag_iitkgp 7 · 0⤊ 0⤋