large and luxurious! China's soil pollution repair technology support has gradually expanded

On May 31, 2016, the State Council issued the Action Plan for Prevention and Control of Soil Pollution, proposing that by 2020 the trend of aggravating soil pollution in the country will be initially contained, the overall environmental quality of the soil will remain stable, and the safety of soil environment in agricultural land and construction land will be basically guaranteed . "Soil ten" made it clear that the implementation of soil pollution control and repair of life-long responsibility system, and clear by 2017 before the introduction of the relevant accountability measures.

At present, China's soil repair market is still in its infancy. According to statistics, China's soil remediation accounts for less than 0.01% of domestic GDP, well below the level of 0.3% in the European and American markets. Soil remediation market is in its infancy, but its development is in good progress. In 2015, the contracted amount of soil remediation contracts reached 2.128 billion yuan, an increase of 67% from 1.274 billion yuan in 2014. The number of soil pollution control and rehabilitation enterprises has increased from 10 to nearly 1,000 in 2010, and the number of employees has increased from about 2,000 to nearly 10,000. The total number of projects has reached over 300.

Priority will be the first in the industry layout of large-scale enterprises Beijing Construction, high-energy environment, environmental protection in Yongqing, Hangzhou earth, Kay days of environmental protection companies will be the first to benefit. These enterprises have the strength to seek breakthroughs in terms of modes and technologies, break the two bottlenecks of technology and capital development, promptly raise the technical level of the industry, solve the capital problems and have good prospects for market development.

Physical repair technology: save money, high yield, sustainable

Physical separation and repair characteristics and applications: Physical separation techniques are mainly used in the repair of inorganic contaminants in contaminated soil. It is best suited to handle contaminated soils within a small area, to separate heavy metals from soils, sediments, and wastes, to clean the soil, and to restore normal soil function. Most of the physical separation and repair techniques have the advantages of simple equipment, low cost and sustainable high output, but in the specific separation process, the feasibility of its technology, to consider the impact of various factors.

Vapor Extraction Repair Features and Applications: The technology can be operated in situ, simpler, with limited interference to the surroundings as small as possible; very effective in removing volatile organic compounds; within acceptable cost range Treat as much contaminated soil as possible; the system is easy to install and transfer; and easy to use in combination with other technologies. Leaching is mainly used for the recovery of volatile organic halides and non-halides. Commonly used pollutants are those that have a Henry's coefficient of greater than 0.0 or a vapor pressure greater than 66.7 Pa, and are sometimes used to remove oil from the environment , Heavy metals and their organic compounds, polycyclic aromatic hydrocarbons and other pollutants. Vapor leaching has almost become the "standard" technology in the United States for the repair of groundwater and soil contaminated with gas stations. The main factors restricting the application effect of soil vapor leaching technology are the heterogeneity of the lower soil, the permeability of the soil, the groundwater level and the discharged gas which need to be further processed.

Electrokinetic repair features and applications: Electrodynamics technology is mainly used for the repair of low permeability soil (due to hydraulic conductivity problems, the traditional technology is limited) for the repair of most inorganic pollutants can also be used for radioactive substances and adsorption The treatment of strong organic matter. Electrodynamics can effectively remove heavy metal ions in soil and groundwater, and can also remove polar organic compounds with strong adsorbability in soil such as phenol and acetic acid. The latest development trend is the combination of electrodynamics and other technologies to strengthen the electrokinetic repair.

Thermodynamic Repair Features and Applications: High-temperature heating technology The main pollutants are semi-volatile halogenated organic and non-halogenated organic compounds, polychlorinated biphenyls and high-density non-aqueous liquid organic compounds. Low temperature in situ heat treatment of contaminants are mainly semi-volatile halogenated and non-halogenated substances and concentrated insoluble liquid substances, volatile organic compounds can also be treated by this method. In addition, the in-situ electromagnetic wave heating repair technology belongs to the high temperature in situ heating technology, which uses the electromagnetic wave energy generated by the high-frequency voltage to heat the soil in the field and utilizes heat to enhance the soil vapor leaching technology so that the pollutants can be desorbed within the soil particles to be repaired The purpose of polluting the soil.

Chemical repair technology: a variety of ways, applicability, to prevent secondary pollution is the key

Curing and Stabilizing Technology Features and Applications: This technology fixes pollutants in the polluted medium and keeps them in a long-term stable state. The immobilization technology encapsulates pollutants in an inert substrate or adds pollutants outside Permeability of materials through the reduction of pollutant exposure to the leaching area to achieve the purpose of limiting the migration of pollutants; Stabilization refers to the effectiveness of pollutants from the morphological transformation, the pollutants into insoluble, migration or toxicity more Small form to achieve harmless to reduce their risk to the ecosystem. It is a rapid control and remediation method that is widely used in soil heavy metal pollution and has obvious advantages for simultaneous treatment of multiple heavy metal contaminated soils. Its advantages for the curing technology has the advantages of simple operation, low price, easy to get curing agent and so on. Cured products facilitate transport; however, stabilization does not necessarily alter the physical characteristics of contaminated soils, thereby increasing the overall efficiency and economy of hazardous waste treatment and disposal systems. Thus, the stabilization technology is expected to become the main field of soil heavy metal pollution repair technology.

Chemical leaching repair technology features and applications: Soil washing repair technology is water or washing solution containing an aqueous solution of acid P alkaline solution, complexing agent or surfactant and other eluent into the contaminated soil or sediment, wash Removal and cleaning of contaminants in the soil. The leached wastewater is discharged after treatment, and the treated soil can be reused safely. Suitable for heavy metal pollution or multi-pollutant mixed pollution medium. Its advantages are: applicability, the current release of such technology in many countries have been engineering applications. The disadvantage is the need for water, so repairing the site requires close proximity to the water and at the same time increases costs due to the need to treat the wastewater.

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