原位覆盖法控制底泥氮释放的研究

Study on In-situ Capping Control Sediment Nitrogen Release

通过模拟试验,研究了不同覆盖材料(砾石、煤渣、红土、黄沙)对原位覆盖法控制底泥氮释放的效果及影响因素。结果表明:四种覆盖材料均能有效地控制底泥氮的释放,抑制效果从大到小依次为:黄沙>红土>煤渣>砾石;在试验设定的覆盖层厚度范围内,四种覆盖材料均随着覆盖层厚度的增加对底泥氮释放的抑制呈增强的趋势,但控制效果的差异越来越小;扰动强度越大,底泥氮向上覆水的释放量就越大;原位覆盖法可以有效地控制底泥氮向上覆水体的释放,但为了提高覆盖效果,应避免扰动因素的影响。

Different covering materials （ gravel, coal cinder, laterite, sand） on in-situ capping control effect and influence factors of sediment nitrogen release were investigated in simulating condition. The results showed that ： four kinds of coveting materials can effectively control the sediment nitrogen release, inhibito- ry effect of from large to small is as follows ： sand, laterite, coal cinder, gravel. In the thickness of the cov- eting range setting in four kinds of covering materials, with the inhibition of the overburden layer thickness increase of sediment nitrogen release were increased, but the difference of the control effect is more and more small. Disturbance can obviously improve the sediment of nitrogen release quantity, and with the in- crease of the turbulence intensity increases. In situ-capping method can effectively control the sediment to the overlying water and nitrogen release, but in order to improve the coverage effect, should avoid the in- fluence of the interfering factors.