According to the analysis report on the development and investment of construction waste treatment industry in China, every 10,000 square meters of construction will produce 500~600 tons of construction waste, while the demolition of 10,000 square meters of old buildings will produce 7,000 ~ 12,000 tons of construction waste. China's construction waste has accounted for more than 30% of the total urban waste. It is conservatively estimated that China will produce more than 1.5 billion tons of construction waste annually in the next decade. Construction waste will reach 2.6 billion tons by 2020 and 7.3 billion tons by 2030.
At present, there are four main disposal methods of construction solid waste in China: backfill elevation, reclamation of land from the sea, mountain construction and recycling. The annual utilization rate of construction waste in eu countries reaches 50%, and that in South Korea and Japan is up to about 97%. However, the utilization rate of construction waste in China is less than 10%. However, in recent years, with the national attention to environmental protection and circular economy development, the construction waste recycling work in provinces and cities throughout the country has been gradually developed.
what are the benefits of construction waste recycling?
1, scrap steel, scrap wire, waste wire and other metals, after sorting, concentration, re-furnace, can be reprocessed into various specifications of steel;
2. After the bricks, stones, concrete and other wastes are broken, they can be replaced by sand for masonry mortar, plastering mortar and concrete bedding; After fine crushing, waste concrete can be mixed with standard sand as fine mortar aggregate for wall and floor plastering, roofing mortar leveling layer, masonry mortar, paving tile, etc.
3, after the scrap brick for the building board aggregate, manufacturing partition board, not only light and high strength and sound insulation, coefficient of expansion is small, because materials easy, cheap and greatly reduce the cost of the board;
4. After crushing, waste concrete blocks can be used as aggregate in cast-in-place concrete or precast components for non-load-bearing parts of buildings. This not only saves construction funds, but also does not reduce the strength of the structure;
5. The regenerated bricks that can be produced include partition brick, module brick, pavement brick, permeable brick, heat preservation brick, grass-planting brick, sound barrier board, etc., of which there are more than 100 kinds, and its performance indexes have reached or exceeded relevant national standards.
Studies have shown that for every 100 million tons of construction waste, 24.3 billion blocks of standard bricks and 36 million tons of mixed materials can be produced, 10 million cubic meters of earth or natural sand can be reduced, 2.7 million tons of coal can be saved, and an additional output value of 8.46 billion yuan will be generated, creating huge economic benefits.
In addition, the recycling of construction waste, as opposed to simple stacking and Landfill, can also reduce the emission of nitrous oxide by 50%, nitride by 99.3% and carbon monoxide by 28%.
how much recycled aggregate can 1 ton of construction waste produce and how much economic benefit?
Construction waste production for aggregate conversion rate can reach 85%, 1 ton of construction waste can produce 0.85 tons of recycled aggregate, 0.01 tons of scrap steel, the rest for other garbage. The selling price of recycled aggregate is about 60% of the selling price of natural sand and stone materials, which can effectively reduce the construction cost by more than 40% and has a great advantage in cost, which is about 30 yuan/ton according to the current market price standard.
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In addition, recycled construction waste aggregate can be used to produce recycled concrete with strength below C30(concrete compressive strength), recycled environmental permeable bricks and blocks, and recycled dry mixed mortar. The recycled products can not only meet the strength requirements, but also have good permeability, which has a high cost performance advantage.
recycling of construction waste in many provinces has started henan
Zhengzhou central city construction waste utilization rate to reach 70% by 2020
Zhengzhou municipal people's government recently issued the implementation plan for the pilot project of construction waste treatment in zhengzhou, which requires the utilization rate of construction waste in the central urban area to reach 70% by 2020.
According to the "plan", this year will carry out the construction waste stock heap risk screening and management work, so that the central urban construction waste increase the utilization rate of resources to 60 percent, the stock consumption rate to 30 percent. In 2019, it will organize and implement a special plan for construction waste, site selection and construction of recycling projects, and improve relevant policies such as charging for disposal of construction waste and promotion and application of recycled products. The utilization rate of the incremental construction waste in central urban areas will reach 65%, and the disposal rate of the stock will reach 100%. By 2020, the system for reducing construction waste emissions, standardizing transportation, and recycling will be basically improved, and the utilization rate of construction waste in central urban areas will reach 70%.
in shandong
Jinan will promote the utilization of construction waste resources, and the utilization rate will reach more than 60% by 2020
A few days ago, the office of the joint conference on comprehensive management of construction waste in jinan issued the opinions on promoting the recycling and utilization of construction waste, focusing on the implementation of the regulations on the management of construction waste in jinan, and further detailed measures.
According to the opinions, jinan city will complete the construction waste recycling project in a planned way and in batches, construct 1~2 construction waste recycling enterprises of above scale in each district, and reasonably arrange at least 1 decoration waste transfer station. Site construction of jinan decoration waste treatment plant, the implementation of decoration waste harmless treatment. By 2020, a system for sorting out construction waste and recycling resources will have been basically established, with the utilization rate of resources reaching more than 60 percent.
Shaanxi
Xi 'an will strengthen the utilization of construction waste resources in an all-round way and strive to reach more than 70% by the end of 2020
The government of xi 'an, shaanxi province recently issued the implementation opinions on strengthening the recycling and utilization of construction waste. According to the opinions, Much starker choices-and graver consequences-in & throughout; During the period, xi 'an will rationally plan and construct at least 6~8 construction waste recycling and utilization plants. By the end of 2020, the utilization rate of construction waste in the built-up areas of xi 'an will reach more than 70%. By the end of 2022, the utilization rate of construction waste in the city's built-up areas will reach more than 80 percent.
According to the guidelines, demolition and demolition waste will be processed into recycled products (recycled aggregate, recycled pre-made products, etc.) through crushing, sorting and other technologies, to replace natural sand and stone, and be used for roadbed filling, housing construction, municipal infrastructure construction, etc. Before the end of 2020, in Hu city area, high land, international harbor area, chang 'an district, baqiao district, established given areas or outer suburbs (county), the construction of 4 ~ 6 demolition waste recycle factory, the implementation package of xi 'an demolition waste disposal. By the end of 2022, xi 'an will strive to achieve zero emissions and full utilization of demolition waste.
{ Beijing _36}
Chaoyang project will be awarded 2 million tons of construction waste within 3 years. Rebirth & throughout; , the resource recovery rate will reach above 95%
This year, chaoyang district issued the "chaoyang district to promote the implementation of construction waste recycling and disposal work", the opinions clearly proposed that the project construction units in the implementation of dismantling, shantytowns, dangerous projects generated by the recycling of construction waste treatment, and construction facilities under construction to encourage the priority to choose recycled materials.
It is understood that a construction waste recycling disposal temporary facilities through crushing — & ndash; Screening & ndash; & ndash; The fully closed technological process of multi-stage separation can convert more than 95% of construction waste into recycled aggregate with the particle size of 0 to 5mm, 5 to 10mm, 10 to 25mm, 25 to 31.5mm, which can be made into recycled backfill materials, recycled road materials, recycled permeable bricks and so on.
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in anhui
Within five years, the utilization rate of construction waste under the provincial cities has reached more than 70%
By the end of 2017, provincial cities had basically completed the construction waste recycling facilities, with the utilization rate of resources reaching more than 30 percent. By 2020, the recycling rate of construction waste under provincial cities is planned to reach more than 70 percent, and the county (city) level of recycling facilities will be completed, bringing the recycling rate to more than 30 percent.
in guizhou
By 2020, the utilization rate of construction waste resources should reach more than 30 percent.
In the notice on strengthening construction waste management and promoting resource utilization issued by the general office of the guizhou provincial government, it is specified that by 2020, the utilization rate of construction waste resources in cities (prefectures) and GUI 'an new area will reach more than 30 percent.
According to the circular, local governments should investigate the basic information of construction waste in their regions, and build recycling projects and consumption fields for construction waste based on the forecast of the region's construction waste stock and increment.
, meanwhile, will conform to the standards of construction waste recycled product listed in the green building materials recommended directory, government procurement directory, clear the government investment projects (such as the state organ office buildings, government investment in schools, hospitals, museums, science and technology museum, the stadium and the city municipal utilities infrastructure project) must be preferred construction waste recycled product.
There is no doubt that construction waste, despite its large volume, can be basically transformed. Materials to be made ” . However, due to the limitation, the concentration of renewable resources recycling industry is generally low, and ldquo; Low small scattered throughout the &; It is difficult to change the pattern in a short time, construction waste “ Collect & ndash; Yun & ndash; Use & throughout; The system is still some way from maturity.
Nowadays, in the concept of foreign developed countries, construction waste can be recycled as materials, its economic benefits are increasingly significant. In Germany, for example, there are about 200 construction waste treatment companies with an annual turnover of 2 billion euros. If the amount of construction waste in China is close to 7.3 billion tons by 2030, it is expected to boost capital worth 300 billion to 400 billion yuan. It can be seen that there are still many business opportunities waiting to be tapped for the disposal of construction waste and connection with the renewable resources network.
