Polluted sites have problems such as occupying land resources, seriously polluting groundwater and soil, and causing air pollution. Treatment methods often use various physical, chemical, biological, thermal, electrical and other technological means to treat polluted soil, thereby changing the structure of pollutants to be treated, or reducing the toxicity, mobility or quantity of pollutants in a single or series of technical units.

Our company mainly adopts engineering control measures for the management and control of polluted sites. By using different forms of artificial barrier systems, pollutants are sealed, or their migration is restricted, or exposure pathways are cut off, thereby reducing the exposure risk of pollutants and protecting the safety of receptors. Common engineering control measures include horizontal coverage, bottom anti-seepage, and vertical barriers.

In the treatment of contaminated sites, the vertical barrier function is to separate two areas, block the connection between pollutants and the surrounding environment, control the diffusion of pollutants from the contaminated site to the outside, and control the inflow of groundwater from the outside into the contaminated site, thereby achieving effective control and treatment of pollutants. According to the standards CJJ 176-2012 "Technical Specification for Geotechnical Engineering of Sanitary Landfills for Municipal Solid Waste" and HG/T 20715-2020 "Technical Specification for Vertical Barrier of Industrial Pollution Sites", the permeability coefficient of the vertical anti-seepage curtain used for controlling leachate pollution in municipal solid waste landfills should be in the range of 10-7cm/s, and its types can be selected from cement bentonite walls, soil bentonite walls, plastic concrete walls, HDPE geomembrane bentonite composite walls, etc. The commonly used vertical anti-seepage technologies such as cement mixing piles and high-pressure rotary jet grouting piles cannot meet the requirements of environmental anti-seepage levels.

GCL vertical barrier technology is currently an advanced composite vertical barrier solution. Since its first application in engineering in 2017, this technology has been applied to multiple central environmental inspection projects. Engineering practice has proven that this technology is safe and reliable, with excellent anti-seepage performance, a permeability coefficient of ≤ 1 × 10-7cm/s, and meets environmental anti-seepage requirements.

Engineering Application Case - Ninghe Project

This project belongs to the risk prevention and control project. The project site is an abandoned pit that stores a large amount of household waste, construction waste, and fly ash. The waste contains a large amount of organic matter, inorganic matter, and toxic substances. Due to the lack of a standard anti-seepage system in the informal landfill, these substances may enter the soil and water bodies with the leachate. At the same time, the outdoor garbage has a serious odor and lacks effective safety protection, posing a threat to the living environment and physical health of local residents.

The GCL composite vertical barrier has excellent anti-seepage performance, and the third-party detection permeability coefficient can reach 10-8 cm/s, meeting the design and national standard requirements. Through the implementation of this project, the diffusion of pollutants has been effectively controlled, achieving the goal of protecting the surrounding environment and contributing to the improvement of the surrounding environment.