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Contaminated soil remediation refers to physically, chemically and biologically transfer, absorb, degrade and transform pollutants in soil, which concentration can be reduced to acceptable levels, or turn toxic and harmful pollutants into harmless substances. Fundamentally, the technical principles for contaminated soil remediation may include: 1.Change the existing form or the mode of combining with the soil of pollutants in soil, reduce the mobility and bioavailability in the environment. 2.Reduce the concentration of harmful substances in the soil. The United States invested nearly $100 billion in contaminated soil restoration in 1990s. The theory and technology of contaminated soil remediation have become the frontiers of environmental science and technology research. The process of soil restoration is quite long, the need to solve the problem of soil pollution, it needs scientists of different disciplines, such as soil science, agronomy, ecology, biogeochemistry, marine scien

In today’s world, oil has become the main energy sources, large amounts of oil and its processed products enter the soil during transportation, manufacturing, and related procedures, resulting in oil contaminated soil, bring harm to the whole biosphere, is one of the most important environmental problems in the world. Bioremediation, as a potentially efficient and low-cost technology, is gaining more and more attention in the study of petroleum pollution. The main types of bioremediation are the following: (1)In-situ bioremediation Refers to the contaminated soil without handling or conveying in situ bioremediation of pollution treatment, the recovery process mainly depends on its natural polluted microbial degradation ability and create appropriate degradation conditions. Related processing techniques are: 1.Pump/Treatment 2.Bioventing 3.Percolation 4.Diffusing (2)Ex-situBioremediation Refers to the bioremediation of contaminated soil in elsewhere, which transportatio

Petroleum contaminated soil is a typical organic contaminated soil. It can be divided into in-situ remediation , site remediation and ectopic remediation according to the form of contaminated soil treatment . Common in-situ soil remediation techniques include soil vapor extraction (SVE), bio-venting (BV), in situ chemical oxidation, and bidirectional extraction. In situ remediation generally involves drilling and pumping. SVE is mainly aimed at high volatile pollutants in unsaturated zones, such as light hydrocarbons and gasoline in petroleum products. However, for the less volatile diesel, fuel oil and kerosene which removal rate is not high, is more suitable for the use of BV. For the more difficult components, an additional oxidant is needed to improve the removal rate.The bidirectional extraction can deal with groundwater, free phase and gas phase of petroleum products, which are polluted in unsaturated and unsaturated zone, but the extracted gas and liquid need to be treated se

Petroleum contaminated soil can be used as a stabilizing material in engineering, such as road construction. A large number of experiments on soil contaminated by oil spill in the Gulf War have proved that petroleum pollution can lead to the decrease of soil strength and permeability, and the increase of compression. After the pollution of crude oil, the bearing capacity of sand soil has also decreased significantly. Fuel oil will also lead to an increase in soil liquid limit, a decrease in the maximum dry density and agglomeration force and internal friction angle, and a decrease in the free compressive strength. The change of shrinkage exponent originates from the change of viscosity of fluid in porous medium. The friction angle of loose saturated sand and dense quartz sand decreased significantly, and the volume strain increased significantly. PARFECT provides professional in situ soil remediation equipment Through the finite element analysis, it is found that the settlement of

When the soft soil foundation bearing capacity can not meet the design requirements, and the thickness of soft soil layer is not very big, dig part or all soft soil foundation out within the scope of the subgrade treatment, and then filling sand of greater strength or other stable performance and no corrosive materials into soil layer, and compacted to the required the density. This kind of subgrade treatment is called soil layer replacement method. It is suitable for treating silt, mucky soil, collapsible loess, plain fill and miscellaneous fill foundation. The strengthening mechanism of soil layer replacement method is: remove the soft soil by artificial, mechanical, or other means, replaced by high strength sand, gravel, plain soil, lime soil, and other stable and non corrosive materials, and tamp a solid foundation for to the required density. If the thickness of soft soil is less than 3 meters, the method of complete digging and replacing can be generally adopted. For the thickn

According to statistics, every year the city brick reached 4.5 billion standard bricks. In order to protect natural resources, our city has banned the use and production of clay bricks. Clay bricks have been replaced by cement bricks and fly ash bricks. But the use of cement brick and fly ash brick is much better than that of clay brick, while sludge brick is just filling the vacancy of building materials market. If use waste mud and sludge from the Sanjiang River to produce building materials, the utilization scheme of building materials represented by sintered brick is more advantageous and has a broad market, it can dredge the river channel and restore and improve the water diversion capacity and shipping capacity, prevent water eutrophication, improve agricultural and sideline production environment and purify the environment of the city, and disposal of construction waste and river silt, solving the contradiction between brick making and soil source shortage in brick and tile mil

Soil stabilization technology is a kind of soil remediation technologies that prevent or reduce the release of harmful chemicals from contaminated soil. Usually used for harmless treatment of soils contaminated by heavy metals and radioactive materials. Soil stabilization technology can not only dig out contaminated soil on the ground, put into the appropriate shape of the mold or placed into the open area after mixing, also can be used in situ stabilization treatment of contaminated land. Soil solidification / stabilization technology contains two concepts. Among them, solidification refers to the inclusion of pollutants, so that they are granular or large, so that the pollutants are in a relatively stable state. In general, it is mainly the process of converting contaminated soil into solid form, that is, the inclusion of contaminants in a solid state of complete structure. Soil stabilization refers to the conversion of pollutants to the state and form of being converted to les

The method is to use a drilling machine to inject a nozzle pipe into the soil layer. The slurry or water is ejected from the nozzle at high pressure to form a jet stream to destroy the soil layer. When the energy of high speed jet fluctuation was shaped, the dynamic pressure is greater than the strength of soil structure, soil particles stripping down from soil, part of the particles spread out with slurry or water, other soil particles mixed with slurry under the jet impact force, centrifugal force and gravity force, re arrange regularly according to the size of a certain percentage of soil and quality. After the slurry solidified, forming a solidified body in soil, can improve the bearing capacity of the foundation, reduce the settlement, can also improve the effecf of supporting and anti-seepage. It is suitable for foundations of silt, cohesive soil, loess, sandy soil, artificial fill and crushed stone soil. PARFECT soil stabilization equipment can transfer the soil binder t