巢湖内源磷释放特点、稳定性及化学控制研究

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.

Study on Rule of Phosphorus Release and Stability in Chaohu Lake

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 AlCl_3 and FeCl_3 on internal P release was researched.