环保疏浚联合土工管袋工艺在重金属污染底泥处理中的应用

Geotextile tubes technology for dewatering and volume reduction of sediments polluted by heavy metals and its engineering case

利用环保疏浚联合土工管袋脱水减容工艺治理某重金属污染河道底泥,考察了该工艺对底泥重金属污染治理的工程应用效果。该工程实施的内容包括:环保疏浚工程、土工管袋脱水工程、底泥加药系统设计实施及尾水处理工程设计实施。结果表明:经过上述联合工艺处理后,底泥的污泥比阻可下降至少80%;硫酰胺类共聚物(ES)稳定剂对重金属Cr和Hg的稳定化率可分别控制在80%~93%和60%~73%。工程实施效果表明,该工艺可实现河道底泥的有效治理,可为该技术在重金属污染底泥处理中的规模化应用提供参考。

Using the treatment project of sediment in a certain river polluted by heavy metals in Shandong Province,the application of environment-friendly dredging with geotextile tubes on dewatering and volume reduction of sediment were investigated.The project mainly included:environment-friendly dredging engineering,geotechnical pipe bag dewatering works,doing system design of sediment and tail water treatment engineering design.The engineering operation results show that the sludge specific resistance of bottom mud can be reduced by more than 80%by adding flocculating agent.The stabilization rates of ES stabilizer for Cr and Hg were 80%~93%and 60%~73%,respectively.The successful implementation of this project provided a foundation for the large-scale application of this technology in treatment of heavy metal contaminated sediment in the future.