城市富营养化水体底泥净化磷效果
Effect of phosphorus purification by sediments in a eutrophic city water body
-
摘要: 以城市富营养化水体底泥和上覆水为材料，研究了扰动状态下底泥对外源磷的净化效果。结果表明，扰动状态下，200 g湿底泥从上覆水中共吸收外源磷19.92 mg，而静止状态下， 200 g湿底泥仅吸收了13.61 mg。然而，厌氧状态下，前者内源磷释放量仅占吸收磷量的43%，而后者则高达63.4%。说明底泥扰动不仅强化了底泥对外源磷的吸收，而且也强化了内源磷的固定能力。这与扰动状态下外源磷在不同形态磷间的数量分布有关。底泥扰动和静止状态下，难释放态磷(HCl-P、闭蓄态Fe/Al-P)的增加量分别占底泥吸收外源磷量的36%和21%。Abstract: The purification of phosphorus (P) by the sediments under sediment disturbance conditions was investigated， using the sediments and overlying water in a eutrophic city water body. The results showed that the total input P with the amount of 19.92 mg and 13.61 mg disappeared from the overlying water to the sediments (200 g) under disturbance conditions and static conditions， respectively. Under anaerobic conditions， the percentage of P release from the former to the total adsorbed P was 43%. However， the value of the latter increased to 63.4%. It is indicated that sediment disturbance enhanced not only P adsorption but also P immobilization in the sediments. The proportion of the increase of refractory P forms (HCl-P， occluded Fe/Al-P) to the total adsorbed P under sediment disturbance and static conditions was 36% and 21%， respectively.
-
Key words:
- phosphorus /
- eutrophication /
- sediment resource /
- city water body
-
-
点击查看大图
计量
- 文章访问数: 2155
- HTML全文浏览数: 1026
- PDF下载数: 940
- 施引文献: 0
下载:
