Parfect

In recent years, more and more soil stabilized projects in China have been growing rapidly, and have become the leading technology. Engineering amount from hundreds of cubic meters to several million cubic meters of soil, soil stabilization technology is not only applied in the remediation of contaminated soil, but also has become an important technology for sediment treatment of river pollution. Soil stabilization technology has been applied to heavy metal contaminated soil and sediment, such as Hg, Pb, CD and as, and is applied in the sediments contaminated by PAHs and pesticides. The technology of chemical oxidation and stabilization combined to repair organic polluted river sediment has also been applied. The stabilized soil and sediment are used in landfill disposal, site barrier and used as subgrade material. At present, most of the soil stabilization projects in China are implemented by stabilizing technology. There are few works on solidification technology, which is in sha...

After more than 10 years of research and application, system of contaminated soil remediation technology including physical / chemical remediation, bioremediation repair and remediation, has been formed, and accumulated the application experience of repairing comprehensive engineering and soil pollution, the new research hotspot of the in situ bioremediation of contaminated soil and based on monitoring the natural repair technology appeared. The future research of polluted soil treatment technology is developed from the following aspects: 1.To develop green soil bioremediation technology Soil bioremediation is more stringent for environmental requirements, such as soil properties, temperature, pH value, and nutritional conditions. This needs to be constantly adjusted in the process of practice and ultimately to find the best condition. For the hyperconcentration plants, they need be collected at the appropriate time and take reasonable treatment and disposal methods. Not only can avoi...

The dumping of silt directly into the sea and landfill has shown its drawbacks. Under the condition that the content of heavy metals in the current sludge has not been effectively controlled, it is very easy to cause two pollution. As a new way of sludge treatment, the energy utilization of silt has not been dabbled in China. In a lot of silt treatment, the resource utilization of the building materials, represented by the silt made sintered bricks, is the best way out. Firstly is the demand for raw materials of building materials industry is very large, a lot of silt can timely disposal; Secondly is that many brick enterprises are facing the dilemma that no soil can be dug up, the original of fixed assets wasted, a lot of silt is the ample supply of its ammunition, to ensure the maximum utilization of resources, social and economic benefits; Thirdly, sludge can be calcined at low temperature. It can become a building material with high value and good energy saving effect, and the toxi...

Although there are many engineering cases of soil stabilization technology research and application in China, there is still a lack of research in comparison with the United States, Europe and Japan. Materials, technology and equipment are difficult to cooperate with each other, and have limited support for actual engineering and environmental management. Lack of experience in practical soil stabilization projects , long-term environmental monitoring and assessment, and extensive process control; The domestic complete set of highly efficient mobile soil stabilization equipment need to be developed. In view of the above analysis, the following countermeasures and suggestions are put forward. First, we should carry out collaborative research on efficient soil stabilization technology, technology and equipment, improve the level of industrialization and equipment technology, and promote the construction and development of soil stabilization engineering in China. Pay attention to the app...

In order to improve the bearing capacity of foundation, reduce the settlement and increase the stability of foundation, the artificial composite soil can be subjected to tensile, compressive, shear or bending action. It is suitable for various soft foundations. The basic principle of reinforcement is to transfer the tensile stress in the soil to the reinforced body through the friction action between the soil and the reinforcement, and the reinforcement is subjected to pulling force. The stress and shear stress of the soil between the reinforcing bars can make the reinforcement and the soil in the reinforced soil play their respective roles. The common geotextiles include geogrids, geotextiles and geocell. In addition to geosynthetics and geogrids, geocell can delay or cut the sliding surface of foundation failure, so that the bearing capacity of foundation is improved. Moreover, geocell can in the soil compartment given three-dimensional constraint, the soil particles become a geocell...

At present, most of the farmland soil pollution is evaluated by the two level standard of soil environmental quality standard (GB15618-1995) promulgated in 1995, and some of them use the upper limit of soil environmental background value to evaluate farmland soil pollution. That is: if lower than the upper limit of the environmental background value is considered to be basically good, and the utilization of farmland soil is not restricted. if higher than the upper limit of environmental background value and below two level standard of soil environmental quality standard, it indicates that there is no pollution yet, the utilization of farmland soil is generally not limited, but the pollution source should be analyzed and controlled. Higher than the standard value of the two level of the soil environmental quality standard, it indicates that it is polluted. The soil environmental quality standard (GB15618-1995) and the soil pollution index (measured value / two standard value) method, gr...

There are three main principles for the remediation technology of soil pollution in farmland: 1.Feasibility principle First, it is technically feasible, and if the effect of the soil remediation technology on the polluted farmland is good, it can reach the expected goal and can be implemented and popularized in a large area. Second is economically feasible, the cost of governance can not be too high, so that the rural and farmers can afford and facilitate the promotion. We should try to adopt the technology with high maturity and operability. 2.Safety principle Techniques such as phytoremediation, microbioremediation, and so on, should be chosen as far as possible to minimize the negative effects of soil fertility and productivity. During the implementation process of farmland soil remediation technology, do not bring in new pollutants, do not generate secondary pollution, and will not have adverse effects on farmland soil environment, crops and surrounding environment and people’s h...