The most popular multi-element soil remediation te

2022-07-26
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The multiple soil remediation technology path refers to the current situation of soil pollution in China. The soil pollution prevention and control law fills the gap in the current legislation of soil pollution prevention and control, and also plays a role in clarifying the environment and clarifying the subject of pollution control

pollution status: wide range, potential risks, can not be ignored

soil pollution is a great threat to "rice bags", "vegetable baskets" and "water tanks". In april2014, the experiments on the experimental properties of ring materials included: tension tighten. tortuous. Tear and peel According to the "national soil pollution investigation bulletin" jointly issued by the Ministry of environmental protection and the Ministry of land and resources, the total over standard rate of soil points nationwide is 16.1%. The soil pollution in the south is more serious than that in the north; The problems of soil pollution in some regions such as the Yangtze River Delta, the Pearl River Delta and the old industrial bases in the Northeast are more prominent, and the heavy metals in the soils of the southwest and Central South regions exceed the standard

"the latest nationwide soil pollution survey shows that the national soil environmental quality is not optimistic, and the industrial, mining and agricultural factors are the main reasons." Luoyongming, a researcher at Nanjing Institute of soil research, Chinese Academy of Sciences, said that soil pollution includes heavy metal pollution and organic pollution. Pollution reduces or loses the productivity of soil and endangers the safety of agricultural products, groundwater and human settlements

"as the early management of China's industrial enterprises is not systematic, and the operation records of most contaminated sites are not filed, it is very difficult to trace the source of site pollution, describe the scope and degree of pollution, and analyze the migration and transformation laws of pollutants." Songxin, a researcher at Nanjing Institute of soil research, Chinese Academy of Sciences, said

illegal burying of hazardous wastes and industrial and mining development have also aggravated soil pollution in some areas. Since 2018, Taizhou, Yancheng, Lianyungang and other places in Jiangsu Province have successively exposed such environmental pollution problems as the illegal burial of solid wastes, the illegal discharge of waste liquids, and the non-standard treatment of waste water. Some enterprises dug 30 meters of ground to bury underground pipes for sewage discharge, some enterprises started work without obtaining environmental assessment procedures, and heavy metal pollutants were stacked in the open at will... Statistics show that in 2018, a total of 390 defendants in Jiangsu Province were sentenced to fixed-term imprisonment or more for environmental pollution crimes, with a total penalty of more than 20million yuan

chenmengfang, a researcher of the "Hundred Talents Program" of the Chinese Academy of Sciences, said that for Jiangsu, which is in the long triangle, the site soil pollution and treatment of chemical enterprises such as coking, electroplating, printing and dyeing, and pesticides are the main problems currently facing. With the development of urbanization, some chemical enterprises need soil remediation after relocation

once the soil is polluted, the consequences will be very serious. Some industry experts said that soil pollution has the characteristics of concealment, latency and long-term. Through the layer by layer conduction of the food chain, the health of animals and humans are deeply affected by soil pollution, and this process is very subtle and difficult to be detected. Moreover, the soil pollution is cumulative at the same time. The aid paid by enterprises and businesses that are not easy to relocate pollutants in the soil is used as the "packaging waste fund" to migrate, diffuse and dilute; Even soil pollution is irreversible. The pollution of heavy metals to soil is basically an irreversible process, and the pollution of many organic compounds also takes a long time to degrade. More importantly, the treatment cost of soil pollution is very high, and the process of effective is relatively slow

remediation technology: multiple paths, precise governance, systematic thinking

in terms of the remediation and remediation technology of contaminated soil, it currently presents the characteristics of multiple paths in China

"at the beginning of the industry, the vast majority of contaminated soil was treated by relatively simple technologies such as cement kiln collaborative incineration or safe landfill. Now, the application of advanced technologies such as thermal desorption, soil leaching, in-situ thermal desorption, in-situ chemical oxidation and bioremediation has become the main stream, and the overall level is synchronized with that of foreign countries." Lishupeng, Secretary General of the soil and groundwater remediation Professional Committee of China Environmental Protection Industry Association and deputy general manager of Beijing Construction Engineering remediation company, said that the diversification and continuous progress of remediation technology made it possible to innovate the application of remediation engineering

previously, the relevant departments had announced a number of technical equipment "sharp tools" for soil remediation. In december2017, the Ministry of science and technology, together with five other departments, organized the compilation of the catalogue of advanced technical equipment for soil pollution prevention and control based on the strength limit of low carbon steel and the cross-sectional area of test pieces, which published the technical routes, main indicators and trial scope of 15 soil remediation technologies (equipment), including ectopic leaching remediation technology for contaminated soil, centipede remediation technology for arsenic contaminated soil, and ectopic indirect thermal desorption technology and equipment

bioremediation and other technologies are a frontier field concerned by current researchers. "Bioremediation is a relatively good method of soil remediation at present, including planting hyperaccumulator plants, inoculating microorganisms, etc. hyperaccumulator plants, such as Rhodiola crassipes, can quickly transport cadmium to the aboveground part. Through the cycle of winter and spring remediation and summer and autumn rice farming, the heavy metal cadmium in the soil can be reduced by 50% after phytoremediation." Luoyongming said that some special plants can continuously accumulate heavy metals like "miners". The current way in China is to burn these plants, while foreign countries can even collect and refine metals

at present, two types of soil remediation are extremely urgent, one is the soil after the relocation of industrial and mining enterprises, and the other is farmland soil. "What the academic community is doing now is to strengthen the analysis of soils in different industries, regions and types of pollution, and provide accurate, green and sustainable remediation technologies." Li Shupeng said that the diversification of soil remediation technology and the refinement of technical solutions are the development direction of this field in the future

soil remediation should not only stay in the technology itself, but also involve extended links such as agricultural production and resource reuse. "In the last decade, China has made great progress in soil treatment in terms of theory, technology and equipment, but there is still a gap with foreign pollution treatment technologies. Now we should not only treat for the sake of treatment, but also consider system solutions. We need to update our thinking on disposal on the basis of ensuring scientific grain production." Shenrenfang, director of the Nanjing Soil Research Institute of the Chinese Academy of Sciences, said

subject: pollution control according to law, social participation, industry orientation

who is the first person to control soil pollution? The formal promulgation of the law of the people's Republic of China on the prevention and control of soil pollution provides a legal basis for the prevention and control of soil pollution in China for the first time, and provides a legal guarantee for clarifying the main body, carrying out the prevention and control of soil pollution, and Solidly Promoting the "pure land defense war"

the law on the prevention and control of soil pollution stipulates that the undertaker of land pollution is the land polluter and the land user. Specifically, it includes 13 categories, including key supervision units of soil pollution, enterprises and institutions that demolish facilities, equipment or buildings and structures, key supervision units, tailings pond operation and management units, and local people's governments

"the domestic soil remediation industry has gone through three stages: economic, legal and driving." Gaoyanli, general manager of Beijing Construction Engineering remediation company, believes that it is expected to be put into operation in the first half of 2019. In the first stage, many soil remediation work will be led by real estate development enterprises, and most of the remediation work will be driven by economic factors; In the second stage, the prevention and control of soil pollution strengthened the governance of the government and polluters, and made the accountability subject of soil pollution prevention and control more clear. The development direction is to "control pollution according to law"; In the future, with the increasing public awareness of soil protection and the strengthening of the central environmental protection supervision, the driving force will become the main driving force of soil remediation

at present, the field of soil remediation has attracted the active involvement of social capital. According to the calculation of industry organizations, at present, China's soil pollution prevention and remediation industry accounts for less than 1% of the total output value of environmental protection industry. However, in developed countries such as Europe, America and Japan, the proportion is as high as 30%, which also means that the soil remediation market has the potential for further exploration in the future

from the perspective of development model, the soil remediation industry has shifted from the traditional contracting of pollution control projects to the diversified models of environmental stewardship, brownfield development and PPP. A pattern of large-scale environmental construction is taking shape. Industry insiders pointed out that according to the line formulated by the "ten soil policies", the deterioration of soil pollution in China will be effectively controlled in 2020, and then enter a benign development stage. In the process of promoting the prevention and control of soil pollution, the door of the soil remediation market will also be continuously opened to social capital, which is expected to open up a more considerable blue ocean space for the development of the industry

the investment in soil remediation is huge, which often requires tens of millions or even hundreds of millions of yuan. At present, the national funds are mainly used to start the treatment and restoration of historical soil, and the expected capital investment will be much larger than the national start-up funds. Some experts suggested that the national and local soil remediation fund system should be established as soon as possible, or leading enterprises should be cultivated through increasing investment and integration, so as to promote the transformation from technology oriented to capital operation, and ensure the sustainable development of China's soil remediation industry

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