白洋淀疏浚底泥絮凝脱水试验及应用*

针对白洋淀生态清淤底泥土工管袋脱水絮凝的问题，开展土工管袋脱水试验研究及工程验证。进行无机絮凝剂、有机絮凝剂和生物絮凝剂的复配小试和中试试验，提出适用于白洋淀土工管袋脱水的絮凝方案，并通过工程化实施，验证了絮凝方案的土工管袋脱水性能。研究采用分组试验的方法，以底泥絮凝后絮体大小、絮体强度和上清液清澈度作为评价指标。结果表明：复配絮凝剂投加量1.5%时，底泥絮凝效果最优，且余水水质化学需氧量（COD）、总磷（TP）改善明显，COD和TP分别削减83.92%和91.18%，土工管袋充填结束第30 d降低底泥含水率至低于55%。

Flocculation dehydration test and engineering application of dredging sediment in Baiyangdian

Aiming at the problem of flocculation dehydration of Baiyangdian ecological dredging sediment by geotextile bags,we carry out the research and engineering verification of geotextile bags''dehydration experiments.Based on the small & medium-scale compound tests of inorganic flocculant,organic flocculant,and biological flocculant,we propose a flocculation scheme suitable for dewatering of Baiyangdian geotextile bags,and verify the dehydration performance of the flocculation scheme by the engineering implementation.We adopt the group test method,and take the floc size,floc strength,and supernatant clarity after flocculation of the sediment as evaluation indicators.The results show that when the dosage of compound flocculant is 1.5%,the flocculation effect of the sediment is the best,and the COD and TP of the residual water are significantly improved,with a reduction of COD and TP by 83.92% and 91.18% respectively.On the 30th day after the filling of the geotextile bags,the water content of the sediment was reduced to less than 55%.