After rapidly adsorbed on the surface of amine-crosslinked magnetic biopolymer resin, the concentrated perchlorate was further reduced to chloride by acclimated anaerobic sludge. The study demonstrated the adsorption characters of resin, microbial reduction of perchlorate and the combined process of perchlorate removal in the aqueous solution. The adsorption equilibrium was achieved in 120 min, and the adsorbed perchlorate was transformed to chloride by ion exchange reaction. Based on Langmuir model, the adsorption capacity of resin for perchlorate is 232.56 mg/g at 293 K. The majority of bacteria in this study are classified within the Rhodocyclus assemblage in the β-subclass of the Proteobacteria. Dissolved perchlorate (100 mg/L) can be completely removed by acclimated anaerobic sludge in 15 hours, and the concentrated perchlorate (~200 mg/g) on the surface of resin would be effectively microbial reduced after 3 days. Neutral environment (pH 7.4), higher biomass and additional electron donor can apparently improve the biological reduction efficiency of concentrated perchlorate. Addition of many co-anions showed the competition adsorption towards perchlorate, especially in the presence of NO3-. This study provides an effective method for perchlorate reduction from aqueous solution by the adsorption-microbial process.

Rapid adsorption-microbial reduction of dissolved perchlorate by novel amine-crosslinked magnetic biopolymer resin

256th National Meeting (2018)

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