巢湖内源磷释放特点、稳定性及化学控制研究

Study on Rule of Phosphorus Release and Stability in Chaohu Lake

以巢湖内源磷负荷为研究对象,通过实验室模拟,探讨了巢湖内源磷释放过程上覆水中ρ(总磷)和ρ(铁)之间的关系,重点研究了pH和溶解氧对内源磷释放的影响,并对实验前后沉积物中各形态内源磷的含量进行比较.结果表明:上覆水中ρ(总磷)与ρ(铁)呈正线性相关;pH相同时,厌氧条件下内源磷的释放量约是好氧条件的9.16倍;无论是好氧还是厌氧条件,内源磷的释放量均是碱性条件最大,酸性次之,中性最小;铝磷、铁磷的释放量随pH增大而增大;在酸性条件下,钙磷是内源磷释放的主要来源.最后讨论了氯化铝和氯化铁控制磷负荷的作用.

The relationship between TP and Fe in the overlying water was appraised, focusing on the research on the pH, DO effects on internal P release in Chaohu Lake in simulated laboratory condition. At the same time, different internal P forms in the experiment were compared. The study showed ： very close linear relations existed between TP and Fe in the overlying water on the releasing process ; the amount of released internal P in anaerobic condition under the same pH was about 9.16 times as much as that in aerobic condition; the amount of released internal P was maximum in alkalinity, followed by acid condition, and minimum in neutral condition; the amounts of released Fe-P, Al-P increased with pH increasing; Ca-P was responsible for the release of P under acid condition. At last, the control effect of AlCl3 and FeCl3 on internal P release was researched.