The rapid adsorption-microbial reduction of perchlorate from aqueous solution by novel amine-crosslinked magnetic biopolymer resin

- Amine-crosslinked magnetic biopolymer resin was prepared for perchlorate uptake.
- This study provides a rapid adsorption-microbial reduction for perchlorate.
- Perchlorate removal by resin mainly includes ion exchange and physical absorption.
- This novel bio-adsorbent could achieve rapid separation from effluents.
- Reduction time, pH and biomass affect efficiency of microbial regeneration obviously.

The aim of this work was to study the adsorption characters of resin, microbial reduction of perchlorate and combined process of perchlorate removal in aqueous solution. Study demonstrated the adsorption equilibrium was achieved in 120 min, which based on ion exchange reaction. Dissolved perchlorate (100 mg/L) can be completely removed by acclimated anaerobic sludge in 15 h, 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 by the adsorption-microbial process.

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