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Polymer industries generate significant amounts of effluent which has to be treated before being discharged into water stream. So far, very little attention has been paid towards polymer effluent treatment by physio-chemical process. In the present study, chemical coagulation–flocculation process was used to separate solids from industrial polymer effluent in order to make the effluent dischargeable with suitable characteristics. Aluminium sulphate [Al₂(SO4)₃] and anionic polyacrylamide (Magnafloc155) were used as coagulant and flocculant respectively. Sulphuric acid (H₂SO₄) and lime solution [Ca(OH)₂] were used to adjust the pH values during the treatment process. A series of jar tests were conducted with different values of pH and dosing amounts of coagulant and flocculant. After each test, the supernatant layer of treated effluent was analysed for chemical oxygen demand (COD), suspended solids (SS …