Effect of dissolved organic matter on nitrate-nitrogen removal by anion exchange resin and kinetics studies |
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| Authors: | Haiou Song Zhijian Yao Mengqiao Wang Jinnan Wang Zhaolian Zhu Aimin Li |
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| Affiliation: | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China. E-mail: songhaiou2005@yahoo.com.cn;National Engineering Research Center for Organic Pollution Control and Resources Reuse, Nanjing 210023, China;State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China. E-mail: songhaiou2005@yahoo.com.cn;National Engineering Research Center for Organic Pollution Control and Resources Reuse, Nanjing 210023, China;Nanjing University & Yancheng Academy of Environmental Protection Technology and Engineering,Yancheng 224002, China;State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China. E-mail: songhaiou2005@yahoo.com.cn;National Engineering Research Center for Organic Pollution Control and Resources Reuse, Nanjing 210023, China;State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China. E-mail: songhaiou2005@yahoo.com.cn;National Engineering Research Center for Organic Pollution Control and Resources Reuse, Nanjing 210023, China;State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China. E-mail: songhaiou2005@yahoo.com.cn;National Engineering Research Center for Organic Pollution Control and Resources Reuse, Nanjing 210023, China;College of Environment, Nanjing University of Technology, Nanjing 210009, China;State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China. E-mail: songhaiou2005@yahoo.com.cn;National Engineering Research Center for Organic Pollution Control and Resources Reuse, Nanjing 210023, China |
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| Abstract: | The effects of dissolved organic matter (DOM) on the removal of nitrate-nitrogen from the model contaminated water have been investigated utilizing the strong base anion exchange resins. With the increase of gallic acid concentration from 0 to 400 mg/L, the adsorption amount of nitrate-nitrogen on the commercial resins, including D201, Purolite A 300 (A300) and Purolite A 520E (A520E), would significantly decrease. However, the presence of tannin acid has little impact on nitrate-nitrogen adsorption on them. Compared to D201 and A300 resins, A520E resin exhibited more preferable adsorption ability toward nitrate-nitrogen in the presence of competing organic molecules, such as gallic acid and tannin acid at greater levels in aqueous solution. Attractively, the equilibrium data showed that the adsorption isotherm of nitrate-nitrogen on A520E resin was in good agreement with Langmuir and Freundlich equations. The rate parameters for the intra particle diffusion have been estimated for the different initial concentrations. In batch adsorption processes, nitrate-nitrogen diffuse in porous adsorbent and rate process usually depends on t1/2 rather than the contact time. The pseudo first- and the second-order kinetic models fit better for nitrate-nitrogen adsorption onto A520E resin. The observations reported herein illustrated that A520E resin will be an excellent adsorbent for enhanced removal of nitrate-nitrogen from contaminated groundwater. |
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| Keywords: | dissolved organic matter strong base anion exchange resin selectivity nitrate-nitrogen |
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