关键词: 沉钒废水, 离子交换, 吸附, 氨氮

Abstract: A large amount of ammonia nitrogen wastewater is produced in the process of vanadium precipitation by ammonium salts and will cause serious environment pollution if discharged directly without treatment. Therefore， four kinds of T42， D001， 001*8 and D113 resins were selected， and their adsorption performance on ammonia nitrogen in vanadium precipitation wastewater were studied. Results show that， T42 resin has the best effect on ammonia nitrogen removal. The optimum parameter for ammonia nitrogen removal by T42 resin: pH is 8， and temperature is 25 ℃ and equilibrium time is 9 min. Enthalpy change is 3.38 kJ/mol， entropy change is 18.90 J/(mol·K) and Gibbs free energy is negative at different temperatures， this indicate that the reaction of T42 resin adsorbed ammonia nitrogen is spontaneous and endothermic process. Pseudo-second order kinetic models are used to describe adsorption process of ammonia nitrogen， and the adsorption process is mainly chemical adsorption. The satisfactory removal of ammonia nitrogen were obtained under the condition of flow rate of 9 min， resin bed height of 14 cm， pH=8 and treated volume of 321 mL after three-stage series treatment， the concentration of ammonia nitrogen was 1.13 mg/L meeting Discharge standard of pollutants for Vanadium Industry. Thus T42 resin can effectively remove the residual ammonia nitrogen in the vanadium precipitated wastewater.

Key words: Vanadium precipitated wastewater, Resin, absorption, Ammonia nitrogen