Colloid Adsorption Of Ammonium Nitrogen The Migration-retention Time And Space Change Rule

By testing indoor sand column,we studied the colloidal,ammonium nitrogen,dissolved ammonium nitrogen,colloid adsorbed ammonium nitrogen in aqueous media migration-retention of spatial and temporal variation,meanwhile analysis the blocking effect of different aqueous media on different forms of ammonium nitrogen,then get the following conclusions:(1)Soil column leached by colloidal ammonium chloride,the different position of the colloid concentration variation is similar,but the maximum relative concentration did not reach 1.Colloids main residence during migration between 0-60cm in 175?m solid particles of sand column,and in the sand column Colloids solids 115?m primary residence between 0-20cm,exhibit heterogeneity accumulated retention characteristic changes in space.Colloids from landfill leachate,Stranded in the sand column in different positions,in the inlet from 0-20cm,Colloids accumulated holdup increased with time,the cumulative maximum retention;Total retention volume would increase firstly and then decrease in where away from the inlet 20-40cm,40-60cm section;At the 60-80cm,80-100cm cumulative amount retained increases with time to a certain extent then tends to be stable.(2)Soil column leached by colloidal ammonium chloride,in the particle size of 175?m and 115?m sand column of solid particles,the average particle diameter of colloids in a different position,were 500nm?1000nm,500nm?1100nm respectively,potentials were-15mv?-21mv,-15mv?-20mv;The average particle diameter of the colloidal release were 380nm?680nm,500nm?930nm,respectively,the potential-14mv?-33mv,-11mv?-40mv.When soil column leached by landfill leachate,in the particle size of sand column 175?m and 115?m solid particles,the average particle size of colloids in a different position,were 500nm?1000nm,500nm?1300nm respectively,potentials were-10mv?-20mv,-15mv?-17mv;In the particle size of 175?m and 115?m sand column of solid particles,the average particle diameter of colloids at various positions were 583nm?1299nm,943nm?1366nm respectively,potentials were-10mv?-40mv,-16mv?-39mv respectively.(3)When soil column leached by landfill leachate,in the particle size of 175?m and 115?m sand column of solid particles,the total accumulated total amount of ammonium nitrogen retention were 39430mg,46818mg,wherein the total accumulated amount of dissolved ammonium nitrogen retention were 39394mg,43167mg respectively,Total accumulation of ammonium nitrogen in the form of colloid adsorption were 1088mg,3635mg respectively.Colloid adsorbed ammonium nitrogen as time increases,accumulated amount of the rapid increase in the retention sand column of solid particles of different size,after a slight decline to a maximum,and ultimately achieve stability.(4)When soil column leached by landfill leachate,the discipline of ammonium nitrogen,dissolved ammonium nitrogen,colloid adsorbed ammonium nitrogen cumulative and release variation,which,with the increase of the test for the first time and a rapid increase,after reaching the maximum stable within a certain range.175?m sand column total ammonium nitrogen,dissolved ammonium nitrogen,colloid adsorbed ammonium nitrogen cumulative release was less than 115?m sand column.(5)In the same position from the inlet,the retardance effect of total ammonium nitrogen and dissolved ammonium nitrogen migrated in an aqueous medium of 175?m sand column was less than 115?m sand column;The retardance effect of dissolved ammonium nitrogen was greater than the total ammonium nitrogen in the same position of the aqueous medium,The retardance effect of dissolved ammonium nitrogen was greater than the total ammonium nitrogen in the aqueous medium,dissolved ammonium nitrogen was more difficult to migrate in an aqueous medium;At the same time,it also showed that the retardance effect of colloid adsorbed ammonium nitrogen migrated in the aqueous medium was small,colloids played a promoting role in the migration of ammonium nitrogen.