有机质、CaCl_2和MgCl_2对细颗粒泥沙絮凝沉降的影响

在CaCl2和MgCl2浓度为0~1.0mmol/L,泥沙浓度为10g/L时,用吸管法研究了有机质、CaCl2和MgCl2对细颗粒泥沙静水絮凝沉降的影响,结果表明,去除有机质后,细颗粒泥沙絮凝沉降加快,其絮凝所需的最佳电解质浓度降低;CaCl2和MgCl2的絮凝能力无明显差异,有机质含量对其几乎没有影响;在相同盐度下,细颗粒泥沙的絮凝沉降速度随电解质摩尔浓度的增大而增大.

Effects of organic matter, CaCl_2 and MgCl_2 on flocculation and settling of fine sediment.

When sediment concentration was 10 g/L and concentration of CaCl2 and MgCl2 ranged from 0 to 1.0mmol/L, the effect of organic matter, CaCl2 and MgCl2 on flocculation and settling of fine sediment in static water was studied with pipette technique. The results showed that fine sediment settled and flocculated faster after removal of organic matter, and optimal electrolyte concentration for the flocculation became lower. The flocculation ability of CaCl2 and MgCl2 had no obvious difference, and it was nearly not effected by the organic matter content. Under the same salt content, the flocculation and settling velocity of fine sediment increased with the increase of electrolyte concentration.