Adsorption of ammonia-nitrogen in landfill leachate on the colloids of beach water-bearing media

摘要

As part of the field investigation of ammonia-nitrogen contamination from landfills in the Tianjin shallow groundwater, two representative water-bearing media were sampled in the Tianjin coastal plain, and their major physico-chemical properties were analyzed. Dynamic curves and isotherms of ammonia-nitrogen adsorption on colloidal particles of water-bearing media were measured and the influence of salt content and pH on the adsorption was evaluated. The research results show that the kinetics of ammonia-nitrogen adsorption on the colloid was logarithmic, the equilibrium period of the adsorption is 20-24 hours, and all the adsorption isotherms are straight. In addition, it is found that the colloids release the ammonia-nitrogen rather than adsorb aqueous ammonia-nitrogen when ammonia-nitrogen content is lower than a certain value. The relationship between the adsorption quantity of ammonia-nitrogen on colloid and pH, salinity is linear decrease and logarithmic decrease,respectively.