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P1-79 Nitrate Removal in Drinking Groundwater Using N-[(2-hydroxy-3-trimethylammonium)Propyl] Chitosan Chloride (HTCC)

Monday, August 1, 2016
America's Center - St. Louis
Jaehyeog Choe, Sejong University, Seoul, Korea, The Republic of
Yongmin Lee, Sejong University, Seoul, Korea, The Republic of
Seok Jin Seo, Sejong University, Seoul, Korea, The Republic of
Nury Lee, Sejong University, Seoul, Korea, The Republic of
Soonyoung Paik, Catholic University, Seoul, Korea, The Republic of
Sanghoon Ko, Sejong University, Seoul, Korea, The Republic of
Introduction: High nitrate nitrogen concentration in ground water can be a threat on human health, especially causing blue baby syndrome in infants. Positively charged chitosan molecules can adsorb negatively charged nitrate nitrogen by ionic binding mechanism; its ion exchange capability appears only in acidic water, but decreases in neutral or slightly acidic water. Therefore it is required to make positively charged chitosan independent of pH. N-[(2-hydroxy-3-trimethylammonium)propyl]chitosan chloride (HTCC) is positively charged chitosan independent of pH at all times.

Purpose: The objective of this study is to investigate the effectiveness of HTCC for removing nitrate from nitrate-spiked aqueous solutions and to examine its adsorption equilibrium and kinetics.

Methods: The kinetics of adsorption at different contact time (0.25 - 360 min) and the equilibrium isotherms at different initial nitrate concentration (1 - 100 mg dm-3), temperature (15, 25 and 35°C), and pH (5.5, 7.0 and 8.5) were investigated. The equilibrium data were fitted using the Langmuir, Freundlich, Sips and Dubinin–Radushkevich adsorption models.

Results: The maximum adsorption capacity was calculated to be 199.6 mg nitrate g-1 HTCC for an initial nitrate concentration of 500 mg L-1. Langmuir adsorption isotherms were used to correlate the equilibrium adsorption data. Based on the correlation coefficients, it was concluded that the Langmuir isotherm was more suitable for representing the equilibrium data of nitrate adsorption. In addition, first and pseudo-second order kinetic models were applied to describe the adsorption process. The kinetic parameters for the pseudo-second order kinetics were determined.

Significance: Removal of nitrate nitrogen using HTCC may play a significant role in supplying drinking groundwater at clean level.

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