The Removal of Manganese from Underground Water by the Immobilized Manganese-Oxidizing Bacteria

Abstract

The manganese-oxidizing bacteria were embedded in polyvinyl alcohol that was cross-linked with boric acid and then processed with glutaraldehyde. The mechanical stability of the immobilized bacteria increased with the concentration of polyvinyl alcohol. The removal rate of manganese increased with the concentration of bacteria only if the bacteria concentration was lower than 1:20(v/v). Adding activated carbon into polyvinyl alcohol had contributed to the development of the mass-transfer, which is benefit to the biological bioactivity, but the mechanical stability would get worse if too many activated carbons were mixed into polyvinyl alcohol. The simulated filter column filled with the immobilized manganese-oxidizing bacteria was cultivated into mature stage which needed about 30 days and the bioactivity of the immobilized manganese-oxidizing was harmed by the toxicity of the cross linking agent and the preparation condition.