Isothermal adsorption characteristics of bioretention media for Fecal Escherichia coli

Abstract

Rainfall runoff contains a huge number of pathogenic bacteria that seriously de-teriorate water quality. Bioretention is an effective approach to removal of path-ogenic bacteria from rainwater. This study uses sandy soil, fly ash, slag, sandy soil+5% fly ash, and sandy soil+5% slag as media to evaluate the adsorption of fecal Escherichia coli. The mechanisms of the five media conform to the Lang-muir's isotherm adsorption equation, and a pseudo-first-order kinetic model is adopted to reveal the absorption kinetics.