镧改性沸石覆盖控制河道底泥污染物释放实验研究

Experimental study on controlling pollutant release from riversediment by covering with lanthanum modified zeolite

通过模拟实验,考察了天然沸石和镧改性沸石对于黑臭河道底泥污染物释放的处理效果。结果表明,由于底泥释放,空白对照组中上覆水体的污染物浓度出现不同程度的上升。天然沸石组和镧改性沸石组均可降低上覆水体中化学需氧量及氨氮、总磷等的浓度。30 d后,镧改性沸石组中水体的化学需氧量、氨氮、总磷分别下降了13.2%、23.4%、55.2%,其中对于总磷的去除效率明显优于天然沸石组。

The effects of natural zeolite and lanthanum modified zeolite on the release of pollutants from black and odorous river sediments were investigated by simulation experiments.The results showed that the concentration of pollutants in overlying water increased in different degrees in the blank control group due to the release of sediment.Natural zeolite group and lanthanum modified zeolite group can reduce COD,ammonia nitrogen and total phosphorus concentration in overlying water.After 30 days,the chemical oxygen demand,ammonia nitrogen and total phosphorus decreased by 13.2%,23.4%and 55.2%respectively,and the removal efficiency of total phosphorus was significantly better than that of natural zeolite group.