Removals of colour and turbidity from stabilized leachate by using alum and glutinous rice flour dual coagulants

Abstract

The effects of alum and glutinous rice flour as dual coagulant on the removals of colour and suspended solid from stabilized leachate were investigated. A series of jar test were conducted by optimizing the dose and pH of single coagulant (alum and glutinous rice flour) and its combination. It was observed that low removals (colour: 46%, suspended solid: 16%) were recorded by glutinous rice as single coagulant at pH 7 and dose 1.2 g/L. However, addition of glutinous rice flour (0.12 g/L) as coagulant aid for alum at pH 6 and dose of alum 2.5g/L, show better removals of colour (86%) and suspended solid (92%) from alum. At same pH and dose of alum as single coagulant, the removals achieved only 79% and 83% of colour and suspended solid, respectively. Thus, addition of glutinous rice flour as coagulant aid improved the colour and suspended solid removals from the stabilized leachate