信江底泥重金属污染异位修复处理技术  

In-situ Remediation Techniques for Heavy Metal Contaminated Sediments in Xin River

作　　者：莫子奋 祖凌鑫 沈应龙 MO Zi-fen;ZU Ling-xin;SHEN Ying-long(The Sixth Geological Brigade of Jiangxi Geological Bureau,Nanchang 330000,China)

机构地区：[1]江西地质局第六地质大队,南昌330000

出　　处：《科学技术与工程》2024年第21期9244-9251,共8页Science Technology and Engineering

基　　金：江西省地质局科技创新基金(2020-HDZ-12)。

摘　　要：为整治城市河道底泥重金属污染,以江西鹰潭信江河道污染底泥为处理对象。采用化学淋洗和固化稳定化技术相结合治理河道底泥重金属污染,设计化学淋洗模型,分析淋洗效果和固化稳定化参数。结果表明,理想淋洗剂为草酸,淋洗时间8 h,固液比1∶5,浓度0.2 mol/L。复合稳定剂最优配比为FeSO_(4)∶MgO∶高岭土=9∶11∶6,投加量为100%。固化材料配比选择底泥∶水泥∶石灰∶砂子=50∶6∶4∶5。处理后的底泥浸出重金属浓度低于标准限值,固化后无侧限抗压强度达到3.48 MPa。In order to address heavy metal pollution in urban river sediments,the contaminated sediments of the Xin River in Yingtan,Jiangxi Province,were chosen as the treatment target.A combined approach using chemical leaching and solidification stabilization techniques was employed to remediate heavy metal pollution in the river sediments.A chemical leaching model was designed to analyze the leaching effect and the parameters for solidification stabilization.The results indicates that oxalic acid is an ideal leaching agent with an optimal leaching time of 8 h,a solid-liquid ratio of 1∶5,and a concentration of 0.2 mol/L.The optimal composite stabilizer ratio is FeSO_(4)∶MgO∶kaolin at 9∶11∶6 with a dosage of 100%.The ratio of solidifying materials is selected as sediment∶cement∶lime∶sand with 50∶6∶4∶5.The concentration of heavy metals leached from the treated sediment is below the standard limit,and the unconfined compressive strength after solidification reaches 3.48 MPa.

关 键 词：河道底泥 重金属 化学淋洗 固化稳定化 

分 类 号：X53[环境科学与工程—环境工程]