摘要
使用土工材料覆盖污染底泥是一种新型底泥原位治理技术,为探索不同类型土工垫对底泥污染物的原位阻隔性能,采用钠基膨润土防水毯(GCL)、配重型GCL以及分别以硅藻土、沸石、活性炭、砂子为功能材料加工制备的土工垫作为土工覆盖材料,通过长期监测土工垫上层的水质变化,对比6种土工垫对污染底泥的阻隔效果,以选择最佳底泥原位覆盖用土工垫。通过连续3个月的监测可知,6种覆盖土工垫均能够有效阻挡底泥中的污染物向水中扩散,其中配重型GCL对污染物的阻隔性能更为全面,其上层水质中COD_(Cr)为8 mg/L,NH_(3)-N为0.053 mg/L,TP为0.07 mg/L,TN为5.84 mg/L,污染物扩散程度在6种土工垫中处于较低水平,且配重型GCL原料价格便宜,制作工艺简单,因此在污染底泥原位覆盖治理中,优先推荐使用配重型GCL。
Using geomaterials to cover polluted sediments is a new sediment in-situ treatment technology.In order to explore the in-situ barrier performance of different types of geomats against sediment pollutants,the geosynthetics clay liner(GCL),additional weight GCL and geomats that made from function materials of diatomite,zeolite,activated carbon and sand respectively as the covering geomaterials.Through long-term monitoring of the water quality of the upper layer of the geomats,the barrier effect of the six geomats on the contaminated sediment were compared,in order to select the best geomats for in-situ coverage of sediment.Through the continuous monitoring for three months,it could be seen that all six types of geomats could effectively prevent the diffusion of sediment pollutants into the water,among which the barrier performance of additional weight GCL was more comprehensive,the COD_(Cr) was 8 mg/L,NH_(3)-N was 0.053 mg/L,TP was 0.07 mg/L and TN was 5.84 mg/L in the upper layer of water,and the degree of pollutant diffusion was at a low level among the six types of geomats.Besides,the raw material of additional weight GCL is cheap and the production process is simple.Therefore,additional weight GCL is recommended to use in the in-situ coverage and treatment of contaminated sediment.
作者
何顺辉
吴东彪
张健
谢世平
HE Shunhui;WU Dongbiao;ZHANG Jian;XIE Shiping(Tianjin Zhonglian Gelin Science and Technology Development Co.Ltd.,Tianjin 301617;Anhui Urban Construction Design Institute Co.Ltd.,Hefei Anhui 230051)
出处
《环境卫生工程》
2022年第3期54-58,64,共6页
Environmental Sanitation Engineering
基金
国家重点研发计划项目(2019YFC1805004)。
关键词
底泥覆盖
原位治理
土工垫
配重型GCL
sediment cover
in-situ treatment
geomat
additional weight GCL
