Adsorption of saline ammonia-nitrogen wastewater by metal-based resin

The existence of salt makes it much more difficult to treat ammonia nitrogen wastewater. The adsorption of ammonia nitrogen wastewater by D001 resin and D751 resin, which were loaded with transition metals (Co²⁺, Ni²⁺, Cu²⁺, Zn²⁺), was carried out under salt-containing conditions. Compared with the resin before loading, the specific surface areas of the metal base D001 (D751) resin increase and the resin morphology is more orderly after the adsorption of ammonia nitrogen. After the absorption of ammonia nitrogen for five cycles, the metal ions are still firmly fixed on the resin, indication that metal base D001 (D751) resin has good stability. It is found by adsorption kinetic study that the adsorption process of ammonia nitrogen by metal-based D001 (D751) resin complies with the quasi-secondary dynamics. Meanwhile, there are chemical forces generated by electron transfer or sharing between the adsorbent and the adsorbate in the adsorption process of ammonia nitrogen. The adsorption mechanism of metal-based resin on salt-containing ammonia-nitrogen wastewater was analyzed, showing that there is coordination adsorption between the metal-based resin and the ammonia nitrogen in the solution, which forms a ligand complex by coordination covalent bonds.