洋沙泡水库底泥总铁迁移影响因素实验研究

Experimental Study on Factors Affecting the Migration of Total Iron in Sediments of the Yangshapao Reservoir

为深入了解吉林省西部洋沙泡水库底泥中总铁释放迁移规律,通过室内模拟实验进行了在不同pH值、水温、溶解氧、水动力条件下底泥总铁迁移影响因素实验研究。结果表明:在实验第10天时,pH值为9的总铁浓度为0.120 mg/L,pH值为6的总铁浓度为0.535 mg/L,是pH值为9的5.57倍;第1天在4℃下总铁浓度为0.024 mg/L,25℃下总铁浓度为0.037 mg/L,是4℃下的1.54倍;第10天在4℃下总铁浓度为0.043 mg/L,25℃下总铁浓度为0.153 mg/L,达到了4℃下的3.56倍;在好氧状态下,第1天总铁浓度为0.037 mg/L,第10天总铁浓度为0.153 mg/L,较第1天提升了3.14倍,在厌氧状态下,第1天总铁浓度为0.089 mg/L,第10天总铁浓度为0.447 mg/L,较第1天提升了4.02倍;当振荡时间为24 h时,0 rad/min下总铁浓度为0.037 mg/L,80 rad/min下总铁浓度为0.249 mg/L,是静止状态下的6.73倍;150 rad/min下总铁浓度为0.513 mg/L,是静止状态下的13.86倍。由此可见碱性环境对底泥中总铁迁移有抑制作用;低温条件下总铁迁移速率慢;溶解氧含量与总铁迁移量成负相关;扰动是底泥中总铁迁移的主因。

In order to understand the migration law of the total iron in the bottom mud of the Yangshapao Reservoir in the western part of Jilin province,through interior simulation experiments,the experimental research on the influencing factors of the total iron migration of the bottom mud under different pH value,water temperature,dissolving oxygen,and water power was performed.The result showed:On the 10th day of the experiment,the total iron concentration with a pH of 9 was 0.120 mg/L,and the total iron concentration with a pH value of 6 was 0.535 mg/L,which was 5.57 times the pH value of 9.On the first day,the total iron concentration at 4℃was 0.024 mg/L,and the total iron concentration at 25℃was 0.037 mg/L,which was 1.54 times at 4℃.On the 10th day,the total iron concentration at 4℃was 0.043 mg//L,the total iron concentration at 25℃was 0.153 mg/L,reaching 3.56 times at 4℃.In the state of aerobic,the total iron concentration on the first day was 0.037 mg/L,and the total iron concentration on the 10th day was 0.153 mg/L,which was 3.14 times higher than that on the first day.In the state of anaerobic,the total iron concentration on the first day was 0.089 mg/L,and the total iron concentration on the 10th day was0.447 mg/L,an increase of 4.02 times from the first day.When the oscillating time was 24 h,the total iron concentration of 0 rad/min was0.037 mg/L,and the total iron concentration under 80 rad/min was 0.249 mg/L,which was 6.73 times in a static state;the total iron concentration under 150 rad/min was 0.513 mg/L,which was 13.86 times in the static state.It can be seen that the alkaline environment has inhibitory effects on the migration of the total iron in the bottom mud.The total iron mobility rate is slow at low temperature conditions.The dissolved oxygen content is negatively related to the migration of the total iron.The disturbance is the main reason for the migration of the total iron in the bottom mud.