摘要
利用底泥原位生态修复(in-situ ecological remediation,ISER)固化技术对村镇级河道疏浚底泥进行原位固化制备固化海绵土生态护岸材料及性能试验探索,并在嘉定区水闸河、横港等镇级河道进行工程示范。试验及工程跟踪监测表明:固化海绵土生态护岸材料无侧限抗压强度和抗剪强度随固化剂掺量、龄期延长呈增长趋势;固化海绵土生态护岸材料早期无侧限抗压强度增长趋势大于后期,而抗剪强度增长率在固化剂掺量为15%时达到最大;当固化剂掺量为15%、发泡剂掺量为1%时,制备的固化海绵土生态护岸材料中毒性较强的重金属Cd、Pb、Cu在28 d浸出质量浓度分别为0.003、0.049、0.021 mg/L,浸出率分别为23.1%、8.7%、10.1%。由此得出,ISER固化技术可以将疏浚底泥无害化和资源化应用于生态护岸建设,有效解决近年来日益严重的疏浚底泥处置消纳和环境保护之间的冲突。
Using in-situ ecological restoration(ISER)of sediment solidification technology,in-situ solidification of dredged sediment in village-level river channels is used to prepare solidified sponge soil ecological bank protection materials and their properties are tested and explored,and engineering demonstration is carried out in Shuizha River and Henggang River of Jiading District.Results show that the unconfined compressive strength and shear strength of solidified spongy soil ecological revetment material increase with the curing agent content and age extension.The growth trend of unconfined compressive strength of solidified spongy soil ecological revetment material in the early stage is larger than that in the later stage,and the growth rate of shear strength reached the maximum when the curing agent content is 15%.When the content of curing agent is 15%and foaming agent is 1%,the leaching concentrations of Cd,Pb and Cu for 28 days,which are highly toxic,are 0.003,0.049,0.021 mg/L,respectively,and the leaching rates are 23.1%,8.7%and 10.1%,respectively.Based on the analysis of mechanical properties of solidified sediment and test data of heavy metal leaching solution,combined with the engineering practice of ISER solidified technology in ecological management of river sediment,such as ecological restoration of river sediment,in-situ solidified sediment and ecological bank protection(slope protection)construction by resource utilization,It is concluded that ISER solidification technology can realize the application of dredged sediment in ecological bank protection construction,and effectively solve the increasingly serious conflict between dredged sediment disposal and consumption and environmental protection in recent years.
作者
孙即梁
田旭
董家晏
季福志
张芬
张鹏刚
SUN Jiliang;TIAN Xu;DONG Jiayan;JI Fuzhi;ZHANG Fen;ZHANG Penggang(Baosen(Shanghai)New Material Technology Co.,Ltd.,Shanghai 200441,China)
出处
《净水技术》
CAS
2022年第S01期226-230,295,共6页
Water Purification Technology
关键词
ISER底泥固化技术
生态护岸
底泥资源化
土力学性质
河道生态化治理
substrate sludge curing technology for ISER
ecological revetment
utilization of sediment
soil mechanical properties
river course ecological management
