3种沸石材料对水中氨氮的吸附特性对比

Comparison of Adsorption Characteristics of Three Zeolite Materials for Ammonia Nitrogen in Water

针对养殖废水中氨氮浓度高、削减难度大的问题,选用3种沸石材料进行实验,考察所选沸石材料对水中氨氮的吸附特性。结果表明:3种沸石材料对溶液中氨氮的吸附以化学吸附为主,沸石A、沸石B和沸石C的平衡吸附量分别为2.98 mg/g±0.05 mg/g、4.52 mg/g±0.03 mg/g和3.83 mg/g±0.01 mg/g,以沸石B吸附效果最好;沸石投加量和溶液初始浓度的增加均可提高氨氮去除率,但单位吸附量会随沸石投加量的增加而减少,随溶液初始浓度的增加而增加;沸石A在溶液pH值为6时,氨氮去除率和吸附量达到最大,为3.44 mg/g,沸石B和沸石C均在溶液pH值为9时,氨氮去除率和吸附量达到最高,分别为4.88 mg/g和4.69 mg/g。

In response to the high concentration and difficulty in reducing ammonia nitrogen in aquaculture wastewater,three types of zeolite materials were selected for experiments to investigate the adsorption characteristics of the selected zeolite materials for ammonia nitrogen in water.The results showed that the adsorption of ammonia nitrogen in solution by three zeolite materials was mainly chemical adsorption.The equilibrium adsorption capacities of zeolite A,zeolite B,and zeolite C were 2.98 mg/g±0.05 mg/g,4.52 mg/g±0.03 mg/g,and 3.83 mg/g±0.01 mg/g,respectively.Zeolite B had the best adsorption effect.The increase of zeolite dosage and initial solution concentration can both improve the ammonia nitrogen removal rate,but the unit adsorption capacity will decrease with the increase of zeolite dosage and increase with the increase of initial solution concentration.When the pH value of the solution is 6,zeolite A has the highest ammonia nitrogen removal rate and adsorption capacity,reaching 3.44 mg/g.Both zeolite B and zeolite C have the highest ammonia nitrogen removal rate and adsorption capacity,reaching 4.88 mg/g and 4.69 mg/g,respectively,when the pH value of the solution is 9.