关键词: 沉钒废水, 树脂, 离子交换柱, 氨氮

Abstract: In order to understand the adsorption effect on ammonia nitrogen in vanadium precipitated wastewater and the recycle ability of T-42 resin， the influence of ratio of height to diameter of ion exchange column， original ammonia nitrogen concentration and series number on adsorption effect were studied，and the isothermal adsorption curve of T-42 resin was analyzed. In addition， the effect of the type， flow rate and concentration of desorbents on ammonia nitrogen desorption were also studied. The results showed that:①The adsorption effect of T-42 resin on ammonia nitrogen was better when the flow rate of wastewater was 9 mL/min and the ratio of height to diameter was 21.0. The adsorption capacity at the penetration point was 21.91 mg/g， and the adsorption capacity at the end point was 34.31 mg/g. The adsorption capacity of resin on ammonia nitrogen increases with original ammonia nitrogen concentration increasing， but the wastewater treated decreases. Wastewater with concentration of ammonia nitrogen 1 999.56 mg/L meets the standard Class One (≤10 mg/L) by two-stage series adsorption. ②The adsorption of ammonia nitrogen by resin matches the Langmuir isothermal adsorption model and the adsorption process is single molecular layer chemical adsorption. The saturated adsorption capacity is 36.845 9 mg/g in 15 ℃， 38.550 5 mg/g in 25 ℃， 40.617 4 mg/g in 35 ℃. The increasing temperature is beneficial to the adsorption. ③In the case of volume concentration of sulfuric acid 18%， flow rate 3 mL/min and desorbent dosage 2.67 bed volumes， the ammonia nitrogen desorption rate of adsorption saturated resin was higher than 99%. T-42 resin can effectively remove ammonia nitrogen from wastewater， and sulfuric acid can desorb and regenerate the resin which adsorbs ammonia nitrogen.

Key words: Vanadium precipitated wastewater, Resin, Ions exchange column, Ammonia nitrogen