Journal ID : TRKU-10-08-2020-10983
[This article belongs to Volume - 62, Issue - 08]
Total View : 435

Title : The influence of pH, zeta potential and particle size of colloids on the reduction of colour and suspended solids from landfill leachate using Tin tetrachloride (SnCl4)

Abstract :

The particles surface charge is classified among the essential criteria in the coagulation and flocculation treatment. Colloidal particles in suspensions are generally dispersed, electrically charged and do not settle by the gravity due to its stability and repulsion. Good settling can be achieved by disrupting the surface charge in the suspension of unstable particles. The zeta potential (ZP) is an indicator or criterion that represents the electrostatic interactions in a particle dispersion and is a measure of particle surface charges. This paper evaluated the mechanism and the effect of pH, ZP and particle size of colloids on the reduction of colour and suspended solids (SS) in leachate by the positive charge coagulant, Tin tetrachloride (SnCl4). A range of experiments on coagulation and flocculation was undertaken using the standard jar test with ZP measurement. It was found that the addition of positively charged SnCl4 as coagulant increased the leachate surface charge. The maximum ZP before the addition of SnCl4 was -22.4 mV at pH 11, and the surface charge of leachate was closed to the point of zero charges at pH 8 with -0.4 mV after the coagulant was added. Highest colour and SS performance were observed at optimum pH 8 with reductions of 98.9% and 100%, respectively. The reduction of repulsive forces at this pH promoted the collision of particles and thus made the aggregation possible

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