不同曝气方式对底泥吸收磷的影响

EFFECT OF DIFFERENT AERATION WAYS ON PHOSPHORUS ADSORPTION ON SEDIMENTS

以河流底泥为材料,模拟研究了不同曝气方式(底泥曝气、水曝气)对底泥吸收磷的影响及对上覆水DO、pH值、浊度的影响。结果表明:底泥曝气可有效恢复水体溶解氧水平,并且pH值保持稳定;而水曝气仅在曝气期间,溶解氧水平较高,停止曝气,溶解氧迅速下降,pH值变化显著。底泥曝气可以有效促进底泥对磷的吸收。底泥总磷的净增加量达到187.2 mg/kg,而Ca-P的净增加量为172.2mg/kg;水曝气对底泥吸收磷的强化作用一般,总磷的净增加量为105.4 mg/kg,并较为均匀地分配到NH4Cl-P、Fe-P、Ca-P三种形态中。

The effect of different aeration ways（aerating to sediments, aerating to water） on phosphorus adsorption on sediments, and the dissolved oxygen（DO）, the pH value, turbidity in overlaying water was studied. The results showed that aerating to sediments could increase DO concentration in overlaying water and pH was kept stable. Aerating to water could only increase DO during aeration, but DO began to decline abruptly after stopping aeration. The effect of this aeration on pH was obvious. Phosphorus adsorption on sediments could be promoted greatly by aerating to sediments. The net increase of TP was up to 187.2 mg/L, while the net increase of Ca-P was up to 172.2mg/kg; The efficiency of phosphorus adsorption on sediments by aerating to water was worse than that by aerating to sediments. The net increase of TP was only 105.4mg/L, and the net increase of TP was distributed basically uniformly to NH4Cl-P, Fe-P, Ca-P.