Adsorption of β - HCH on Constructed Wetland Substrates

Abstract

β-HCH is a kind of widespread organochlorine pollutant in the environment, and constructed wetland is considered one of the potential methods to remove organochlorine pesticides. Substrate is an important component of constructed wetland, and plays an indispensable role in the removal of β-HCH in waste water. In this study, the adsorption and desorption of β-HCH by different substrates were studied, though adsorption tests of three kinds of substrate including soil, sand and coal cinder, screened out wetland substrate with high adsorbing capacity. The study shows that three kinds of substrate have varying degrees of adsorption capacity for β-HCH. Among them, the adsorption ability of coal cinder to β-HCH can reach 33.6 μg/g after concussion for 0.5h; the sand has lowest adsorption capacity, which reaches 2.9 μg/g after concussion for 2h. Three kinds of substrate ability: coil cinder > soil >sand.