絮凝剂提高疏浚泥浆泥水分离性能研究

Research on flocculants improving dredged slurry mud-water separation performance

为了考察絮凝剂对疏浚泥浆泥水分离效果的影响,以当涂姑溪河疏浚泥浆为研究对象,选用8种絮凝剂通过量筒静置试验观测泥浆静态脱水效果,确定最佳絮凝方案并研究不同泥浆浓度情况下絮凝剂的投加量及沉降效果,并在动态试验中结合经济性统筹选择最佳方案。结果表明,疏浚泥浆含泥量为5%时,最佳絮凝剂为PFS,其投加量为200 mg/L时沉降比为21.38%。当泥浆含泥量在15%以下时,絮凝剂最佳投加量与泥浆浓度基本无关,但随着泥浆浓度上升,沉降速度明显下降,上清液也变清澈,剩余淤泥体积显著增加。动态试验中Ca(OH)_(2)最佳投加量为70 mg/L,此时泥水分离效果好,成本低。絮凝剂可显著提高疏浚泥浆泥水分离效果,减少疏浚堆场占地面积和泥浆干化时间。

In order to investigate the influence of flocculants on dredged slurry mud-water separation performance, taking dredged slurry of Guxi river of Dangtu as the research object, 8 kinds of flocculants were selected to observe the dehydration effect of dredged slurry through static test of measuring cylinder, the optimal flocculation scheme was determined, the flocculant dosage and sedimentation effects under different slurry concentrations were investigated;Besides, combined with economy, the optimal scheme was finally determined in dynamic test. The results showed that, when the silt content of dredged slurry was 5%, the best flocculant was PFS,with 200 mg/L of dosage, the setting ratio was 21.38%. The optimal dosage of flocculant was irrelevant to the slurry concentration when the silt content of slurry was below 15%. However, with the increase of slurry concentration, the settling velocity decreased obviously, the supernatant became clear and the volume of residual sludge increased significantly. The optimal dynamic test scheme is Ca(OH)_(2) with the dosage of 70 mg/L, under which the mud-water separation effect is good and the cost is low. Flocculants can significantly improve the mud-water separation effect of dredged slurry, reduce the floor area of the dredged slurry storage yard and shorten the drying time of the slurry.