Abstract
This study investigated the coag-flocculation performance of oxidized starch coagulant (OSC) and its blends with alum and FeCl3 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 FeCl3 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 FeCl3 showed high level of efficiency, for the treatment of coal washery effluent.
Highlights
Clarity of water is important towards manufacturing and products meant for human consumption
It could be observed that turbidity removal increased from 98.2% at 100 mg/L to 99.8% at 250 mg/L optimum dosage
The results indicate the effect of the coag-flocculation of oxidized starch coagulant (OSC) when blended with FeCl3 and alum
Summary
Clarity of water is important towards manufacturing and products meant for human consumption. This process highlights a water treatment mechanism that stimulates the aggregation of suspended particles to settlable flocs by the destabilization of the charged colloids neutralizing the forces that keep them apart. Coal washery effluent wastewater has high suspended colloidal particle of mainly clay origin It has an average initial turbidity of 23360.0NTU, pH of 2.68, TSS of 808.76 mg/l, TDS of 449.232, alkalinity of 1.0 mg/l CaCo3 etc. This work demonstrated the effective application of OSC (Oxidized Starch Coagulant) for clarification of coal washery effluent. It further investigated the effect of dosage, pH as well as the blend of OSC.
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