Abstract
A novel anion exchange resin AEE-3 was synthesized by N-alkylation of a weakly basic polyacrylic anion exchanger D311 with 1-bromopropane to effectively remove nitrate (NO3−-N) from aqueous solution. The related finding revealed that its adsorption isotherm obeyed the Langmuir model well, and the second-order model was more validated for the NO3−-N adsorption kinetics study. Compared to commercially-available polystyrene-based nitrate specialty resin Purolite A 520E (A520E), AEE-3 resin has a higher adsorbed amount and better regeneration performance toward NO3−-N in the existence of dissolved organic matter (DOM) using static and dynamic methods. Notably, a real secondary treated wastewater (STWW) obtained from a local municipal wastewater treatment plant was also assessed for NO3−-N removal in fixed-bed columns. Observations from this study indicated that AEE-3 could effectively remove NO3−-N from contaminated surface water.
Highlights
With the rapid development of industry and agriculture, excessively-used nutrients such as nitrogen (N) and phosphorous (P) in crop production have been infiltrated into rivers, lakes and ponds, leading to the eutrophication of aquatic systems [1,2]
Observations from this study indicated that AEE-3 could effectively remove NO3 − -N from contaminated surface water
Current approaches like reverse osmosis, electrodialysis, biological denitrification, adsorption and ion exchange have been utilized to treat NO3 − -N polluted water [5,6]
Summary
With the rapid development of industry and agriculture, excessively-used nutrients such as nitrogen (N) and phosphorous (P) in crop production have been infiltrated into rivers, lakes and ponds, leading to the eutrophication of aquatic systems [1,2]. Nitrate (NO3 − -N) pollution in surface and ground water is a severe environmental problem due to its carcinogenicity, toxicity and potential hazards to human health and livestock. Current approaches like reverse osmosis, electrodialysis, biological denitrification, adsorption and ion exchange have been utilized to treat NO3 − -N polluted water [5,6]. In consideration of the merits of ion exchange, such as high efficiency, acceptable regeneration and cost-effective preparation, anion exchange resins (AERs) have been employed to adsorb NO3 − -N from contaminated water [7,8,9]. Polystyrene AERs have been used to effectively adsorb NO3 − -N from ground water in the past decade [10,11]. High concentrations of dissolved organic matters (DOMs) always exist in surface water, including secondary treated wastewater (STWW), Appl.
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