jar test, dosing, coagulation, flocculation

raw water parameters are to be recorded, jar test is carried out to determine the optimum dosage for coagulation

hyrated lime is used for pH adjustment than aluminium sulphate is added, graph is plotted to get the optimum dosage of those chemicals which will be used later on in this process



silos where hydrated lime is stored

slurry tank where hydrated lime solution is prepared

metering pump for hydrated lime and aluminium sulphate

dosing points




a good jar test should by right represents a correct / optimum dosage and adequate coagulation for flocculation, resulting a good end product.

AL₂(SO4)₃.14H₂O + 3Ca(OH) ₂ → 2Al(OH) ₃ ↓+ 3CaSO₄ + 14H₂O