Nephelometric Performance Evaluation of Oxidized Starch in the Treatment of Coal Washery Effluent
- 1 Chemical Engineering Department, Michael Okpara University of Agriculture, Umudike, Nigeria
- 2 Chemical Engineering Department, Michael Okpara University of Agriculture, Umudike, Nigeria
- 3 Chemical Engineering Department, Nnamdi Azikiwe University, Awka, Nigeria
Abstract
This study investigated the coag-flocculation performance of oxidized starch coagulant (OSC) and its blends with alum and FeCl 3 in removing turbidity from coal washery effluent at room temperature. A conventional laboratory bench-scale jar test apparatus was employed for the experiments. Coag-flocculation parameters such as reaction order α , rate constant K , coagulation time τ , etc. were determined. The optimum pH was observed at 4.0, while the blend of 30.0 mg/L FeCl 3 and 250.0 mg/L OSC achieved the optimum turbidity removal. Turbidity removal efficiency was recorded between 96.0% and 99.9% for various dosages and pH studied. The coagulation rate constants, K recorded range from 9.393 × 10 - 5 L/mg.min to 8.294 × 10 - 1 min - 1 , while coagulation periods τ , range from 3.8 s to 235.7 s for various dosages and pH studied. The use of OSC blended with FeCl 3 showed high level of efficiency, for the treatme nt of coal washery effluent.
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