城市富营养化水体底泥净化磷效果

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%。

Effect of phosphorus purification by sediments in a eutrophic city water body

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.