Parfect

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...

The foundation treatment is mainly divided into basic engineering measures, rock and soil reinforcement measures . Some projects do not change the engineering properties of the foundation, but only take basic engineering measures. Some projects also reinforce the soil and rock at the same time, so as to improve their engineering properties. Selecting the appropriate foundation form without changing the engineering properties of the foundation can meet the requirements of the foundation called natural foundation; otherwise, the reinforced foundation is called the artificial foundation. The design and construction quality of foundation treatment is directly related to the safety of buildings. If handling is not proper, engineering quality accidents often occur, and afterwards, most of them are difficult to remedy. Therefore, a strict quality control and acceptance system is required for the foundation treatment in order to ensure the quality of the project. PARFECT soil stabilization eq...

1.The replacement layer method. It is to remove the bad ground soil, and then backfill the soil with better compaction characteristics to compacted or tamped to form a good bearing layer. Thus, the bearing capacity of the foundation is changed and the ability to resist deformation and stability is improved. In the construction of the project, there are several methods, such as gravel cushion method, replacement method and riprap compaction method, etc. 2.Drainage consolidation method. The main characteristics of the drainage consolidation method are the maturity of the theory, the simple construction equipment and the low cost. The principle of drainage consolidation is that the soft ground under the action of load, the pore water in the soil is slowly discharged, the volume of the pore is decreasing, and the consolidation deformation occurs in the foundation. At the same time, with the gradual dissipating of the excess pore water pressure, the effective stress of the soil increases an...

There are 4 kinds of sludge produced in a city: construction mud, river silt, ditch mud and sewage treatment plant sludge. Compared with construction mud, the other 3 kinds of sludge are easily contaminated by two pollutants, because they contain pathogens, parasites (eggs), heavy metals and some organic pollutants which are difficult to degrade. With the development of society and economy, the amount of sludge is increasing, and the countries all over the world have paid more and more attention to its disposal and resource utilization. Because of the different national conditions, the disposal methods of different countries are different. At present, the way of sludge treatment is mainly dumping, landfilling, fertilizer, energy and building materials. 1.Dumping at sea. Some countries near the coast, such as the UK, the US and Japan, have used the disposal method to directly dump the silt. However, in the long run, they will pollute marine resources and cause global ecological problems...