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Kinetics and Particle Removal Profile of Pulverized Snail Shell – Alum Induced Coag-Flocculation of Quarry Effluent

C. Nnaji Patrick, I. Okolo Bernard, Menkiti Matthew Chukwudi, Ume Cyril Sunday, Chizoba Chinelo Agu

Current Journal of Applied Science and Technology · pp. 621–632 · Published 24 Nov 2014

10.9734/BJAST/2015/13631

Abstract

This study investigated the coag-flocculation performance of alum, pulverized snail shell coagulant (PSSC), and their blends under varying pH and coagulant dosage in removing turbidity from quarry effluent (QE) at room temperature. A laboratory bench-scale jar test was employed for the experiments. Coag-flocculation parameters such as coagulation rate constant, K11, coagulation half-time,τ_(1/2) etc were determined. The optimum pH was observed at 6.0, while the blend of 200.0 mg/L alum and 800.0mg/L PSSC achieved the optimum turbidity removal. Turbidity removal efficiency was recorded between 87.9% and 98.5% for various dosages and pH studied. The coagulation rate half-time, τ_(1/2) range from 13.8s to 972.45s for various dosages and pH studied. The use of PSSC blended with alum showed high level of potential, for the treatment of quarry effluent.

Snail shell quarry effluent coagulation/flocculation jar test

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