Contaminated site management and control
Polluted sites have problems such as occupying land resources, seriously polluting groundwater and soil, and causing air pollution. The treatment methods mostly use various physical, chemical, biological, thermal, electrical and other technical means to treat the contaminated soil, thereby changing the level of pollutants to be treated. structure, or a single or series of technical units that reduce the toxicity, mobility or quantity of contaminants.
Our company mainly adopts engineering control measures for the management and control of polluted sites. By using different forms of artificial barrier systems, the pollutants are sealed, or the migration of pollutants is restricted, or the exposure route is cut off, thereby reducing the exposure risk of pollutants and protecting victims. body safety. Commonly used engineering control measures include horizontal coverage, bottom anti-seepage and vertical barriers.
In the treatment of polluted sites, the function of the vertical barrier is to separate the two areas, block the connection between pollutants and the surrounding environment, control the diffusion of pollutants in the polluted site to the outside world, and control the inflow of groundwater from the outside world into the polluted site, so as to achieve Effective control of pollutants. Standard CJJ 176-2012 "Technical Specifications for Geotechnical Engineering of Domestic Waste Sanitary Landfills" and HG/T 20715-2020 "Technical Specifications for Vertical Barriers of Industrial Polluted Sites", which are used for leachate pollution control of domestic waste landfills. The permeability coefficient of the vertical anti-seepage curtain should be in the order of 10-7cm/s, and its types can be selected from cement-bentonite wall, soil-bentonite wall, plastic concrete wall, HDPE geomembrane-bentonite composite wall, etc. Commonly used vertical anti-seepage technologies such as cement mixing piles and high-pressure rotary jet piles cannot meet the requirements of environmental protection and anti-seepage levels.
GCL vertical barrier technology is currently the more advanced composite vertical barrier solution. Since the first application of GCL vertical barrier technology in engineering in 2017, this technology has been applied to many central environmental protection inspection projects. Engineering practice has proved that the technology is safe and reliable, with excellent anti-seepage performance, and the permeability coefficient is less than or equal to 1×10-7cm/s, which meets the requirements of environmental protection and anti-seepage.
Engineering application case - Ninghe project
This project is a risk prevention and control project. The project plot is an abandoned pit, storing a large amount of domestic waste, construction waste and fly ash, etc. The waste contains a large amount of organic, inorganic and toxic substances. Due to the lack of a standard anti-seepage system in the informal landfill, The above substances may enter soil and water bodies with leachate. At the same time, the stench of garbage in the open air is serious, and there is a lack of effective safety protection, posing a threat to the living environment and physical health of local residents.
GCL composite vertical barrier barrier has excellent anti-seepage performance, and the third-party testing permeability coefficient can reach 10-8 cm/s, which meets the requirements of design and national standards. Through the implementation of this project, the diffusion of pollutants has been effectively controlled, the purpose of protecting the surrounding environment has been achieved, and it has contributed to the improvement of the surrounding environment.