tailieunhanh - Ammonium transport experiments in soil columns: Estimating transport parameters

The transport parameters are estimated under supportting of software Hydrus 1D using the inverse parameter estimation method. Results of the experiments showed that dispersion coefficient, distribution coefficient and mass transfer coefficient characterized the ammonium transport process in the Con Son soil and aquifers are compatible with mechanical and physical properties of Con Son soil matrix and porous media. | Vietnam Journal of Science and Technology 55 (3) (2017) 293-304 DOI: AMMONIUM TRANSPORT EXPERIMENTS IN SOIL COLUMNS: ESTIMATING TRANSPORT PARAMETERS Nguyen Thi Minh Trang1, 2,*, Le Dinh Hong2, Vo Khac Tri3 1 2 Ho Chi Minh City University of Architecture, 196 Pasteur, District 3, Ho Chi Minh City Ho Chi Minh City University of Technology, 268 Ly Thuong Kiet, District 10, Ho Chi Minh City 3 Southern Institute of Water Resources Research, 658 Vo Van Kiet, District 5, Ho Chi Minh City * Email: canxius@ Received: 14 September 2016; Accepted for publication: 7 April 2017 ABSTRACT Soluble contaminant transport into groundwater aquifers is one of the current practical problems occuring not only in Vietnam but also in many countries around the world. In this paper, according to the main objective of estimating the ammonium (NH4+) transport parameters in soil and groundwater aquifer of Con Son Island - District Con Dao, experiments with conservative tracers (sodium chlorides) and ammonium chlorides solution had been carried out on the Con Son soil columns. The transport parameters are estimated under supportting of software Hydrus 1D using the inverse parameter estimation method. Results of the experiments showed that dispersion coefficient, distribution coefficient and mass transfer coefficient characterized the ammonium transport process in the Con Son soil and aquifers are compatible with mechanical and physical properties of Con Son soil matrix and porous media. Keywords: ammonium transport, groundwater pollution, Hydrus 1D. 1. INTRODUCTION Inorganic nitrogen in the form of ammonia (NH3) and the ammonium ion (NH4+) is recognized as one of the most common groundwater contaminants arising from waste disposal activities, fertilizer use and contaminated land [1]. As a relatively mobile ion, NH4+ accordingly would have the ability to spread rapidly and widely in the aquifers and contaminate groundwater when it reaches into .